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Majewska N, Tsai YT, Zeng XY, Fang MH, Mahlik S. Advancing Near-Infrared Light Sources: Enhancing Chromium Emission through Cation Substitution in Ultra-Broadband Near-Infrared Phosphors. Chem Mater 2023; 35:10228-10237. [PMID: 38107190 PMCID: PMC10720341 DOI: 10.1021/acs.chemmater.3c02466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 11/03/2023] [Accepted: 11/03/2023] [Indexed: 12/19/2023]
Abstract
The growing interest in the use of near-infrared (NIR) radiation for spectroscopy, optical communication, and medical applications spanning both NIR-I (700-900 nm) and NIR-II (900-1700 nm) has driven the need for new NIR light sources. NIR phosphor-converted light-emitting diodes (pc-LEDs) are expected to replace traditional lamps mainly due to their high efficiency and compact design. Broadband NIR phosphors activated by Cr3+ and Cr4+ have attracted significant research interest, offering emission across a wide range from 700 to 1700 nm. In this work, we synthesized a series of Sc2(1-x)Ga2xO3:Cr3+/4+ materials (x = 0-0.2) with broadband NIR-I (Cr3+) and NIR-II (Cr4+) emission. We observed a substantial increase in the intensity of Cr3+ (approximately 77 times) by incorporating Ga3+ ions. Additionally, our investigation revealed that energy transfer occurred between Cr3+ and Cr4+ ions. Configuration diagrams are presented to elucidate the behavior of Cr3+ and Cr4+ ions within the Sc2O3 matrix. We also observed a phase transition at a pressure of 20.2 GPa, resulting in a new unknown phase where Cr3+ luminescence exhibited a high-symmetry environment. Notably, this study presents the pressure-induced shift of NIR Cr4+ luminescence in Sc2(1-x)Ga2xO3:Cr3+/4+. The linear shifts were estimated at 83 ± 3 and 61 ± 6 cm-1/GPa before and after the phase transition. Overall, our findings shed light on the synthesis, luminescent properties, temperature, and high-pressure behavior within the Sc2(1-x)Ga2xO3:Cr3+/4+ materials. This research contributes to the understanding and potential applications of these materials in the development of efficient NIR light sources and other optical devices.
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Affiliation(s)
- Natalia Majewska
- Institute
of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdansk, Wita Stwosza 57, 80-308 Gdansk, Poland
| | - Yi-Ting Tsai
- Research
Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Xiang-Yun Zeng
- Research
Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Mu-Huai Fang
- Research
Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Sebastian Mahlik
- Institute
of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdansk, Wita Stwosza 57, 80-308 Gdansk, Poland
- International
Centre for Theory of Quantum Technologies (ICTQT), University of Gdansk, 80-308 Gdansk, Poland
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2
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Tsai YT, Majewska N, Kamiński M, Lin BH, Mahlik S, Fang MH. Hidden Hexavalent Chromium Ions with Subtle Structural Evolution in Near-Infrared Phosphors. ACS Appl Mater Interfaces 2023; 15:49379-49389. [PMID: 37842834 DOI: 10.1021/acsami.3c11866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
Cr-doped inorganic materials are pivotal in developing near-infrared optical materials; however, multivalent Cr ions and their respective distribution in the materials remain ambiguous. Herein, a series of Li(Sc1-xInx)O2:Cr phosphors containing both Cr3+/Cr6+ ions are prepared. High-resolution synchrotron X-ray diffraction (XRD) reveals two similar phases in Li(Sc1-xInx)O2. Raman spectra further confirm distinct scattering patterns for the two end-member compositions, corroborating the findings from the synchrotron XRD analysis. Cr K-edge X-ray absorption near-edge structure and extended X-ray absorption fine structure demonstrate that most Cr ions in the as-prepared samples are Cr6+, while Cr3+ becomes dominant after washing with water. Moreover, the source and distribution of Cr3+ and Cr6+ ions in the as-prepared and washed samples are revealed through X-ray fluorescence and X-ray excited optical luminescence techniques, which indicate that Cr6+ ions aggregate within the sample, while Cr3+ ions are evenly distributed. Photoluminescence, decay curves, and line shape analyses are implemented to resolve the electron-lattice interactions, and the corresponding mechanisms are provided to explain the asymmetry between photoluminescence and photoluminescence excitation spectra. Overall, this study provides valuable insights into the distribution of low-concentration multivalence ions in solid-state materials and offers a deeper understanding of the approaches to precisely resolve the subtle changes in the crystal structure.
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Affiliation(s)
- Yi-Ting Tsai
- Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Natalia Majewska
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdansk, Wita Stwosza 57, 80-308 Gdansk, Poland
| | - Mikołaj Kamiński
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdansk, Wita Stwosza 57, 80-308 Gdansk, Poland
| | - Bi-Hsuan Lin
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - Sebastian Mahlik
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdansk, Wita Stwosza 57, 80-308 Gdansk, Poland
- International Centre for Theory of Quantum Technologies (ICTQT), University of Gdansk, 80-308 Gdansk, Poland
| | - Mu-Huai Fang
- Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
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3
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Chuang CH, Kang PH, Lai YY, Hou CH, Tseng WC, Huang YJ, Fang MH, Shyue JJ, Kaun CC, Cheng YJ. Highly Active NiO-Ni(OH) 2 -Cr 2 O 3 /Ni Hydrogen Evolution Electrocatalyst through Synergistic Reaction Kinetics. ChemSusChem 2023; 16:e202300820. [PMID: 37421638 DOI: 10.1002/cssc.202300820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 07/06/2023] [Accepted: 07/07/2023] [Indexed: 07/10/2023]
Abstract
High activity catalysts for hydrogen evolution reaction (HER) play a key role in converting renewable electricity to storable hydrogen fuel. Great effort has been devoted to the search for noble metal free catalysts to make electrolysis viable for practical applications. Here, a non-precious metal oxide/metal catalyst with high intrinsic activity comparable to Pt/C was reported. The electrocatalyst consisting of NiO, Ni(OH)2 , Cr2 O3 , and Ni metal exhibits a low overpotential of 27, 103, and 153 mV at current densities of 10, 100, and 200 mA cm-2 , respectively, in a 1.0 m NaOH electrolyte. The activity is much higher than that of NiOx /Ni or Cr2 O3 alone, showing the synergistic effect of NiOx /Ni and Cr2 O3 on catalyzing HER. Density functional theory calculations shows that NiO and Cr2 O3 on Ni surface lower the disassociation energy barrier for breaking H-OH bond, while Ni(OH)2 and Cr2 O3 create preferred sites on Ni surface with near-zero H* adsorption free energy to promote H* to gaseous H2 evolution. These synergistic effects of multiple-oxides/metal composition enhance the disassociation of H-OH and the evolution of H* to gaseous H2 , thus achieving high activity and demonstrating a promising composition design for noble metal free catalyst.
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Affiliation(s)
- Chi-Huang Chuang
- Research Center for Applied Sciences, Academia Sinica, 128 Sec. 2, Academia Rd, Nankang, Taipei, 115, Taiwan
| | - Pei-Hao Kang
- Research Center for Applied Sciences, Academia Sinica, 128 Sec. 2, Academia Rd, Nankang, Taipei, 115, Taiwan
| | - Yung-Yu Lai
- Research Center for Applied Sciences, Academia Sinica, 128 Sec. 2, Academia Rd, Nankang, Taipei, 115, Taiwan
| | - Cheng-Hung Hou
- Research Center for Applied Sciences, Academia Sinica, 128 Sec. 2, Academia Rd, Nankang, Taipei, 115, Taiwan
| | - Wei-Che Tseng
- Department of Materials Science and Engineering, National Cheng Kung University, No.1, University Road, Tainan, 701, Taiwan
| | - Yan-Jia Huang
- Department of Materials Science and Engineering, National Cheng Kung University, No.1, University Road, Tainan, 701, Taiwan
| | - Mu-Huai Fang
- Research Center for Applied Sciences, Academia Sinica, 128 Sec. 2, Academia Rd, Nankang, Taipei, 115, Taiwan
| | - Jing-Jong Shyue
- Research Center for Applied Sciences, Academia Sinica, 128 Sec. 2, Academia Rd, Nankang, Taipei, 115, Taiwan
| | - Chao-Cheng Kaun
- Research Center for Applied Sciences, Academia Sinica, 128 Sec. 2, Academia Rd, Nankang, Taipei, 115, Taiwan
| | - Yuh-Jen Cheng
- Research Center for Applied Sciences, Academia Sinica, 128 Sec. 2, Academia Rd, Nankang, Taipei, 115, Taiwan
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Zhang YY, Liu KT, Fang MH, Leung MK. Quantum Dot-Vitrimer Composites: An Approach for Reprocessable, Self-Healable, and Sustainable Luminescent Materials. ChemSusChem 2023:e202300227. [PMID: 37276430 DOI: 10.1002/cssc.202300227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 04/16/2023] [Indexed: 06/07/2023]
Abstract
Quantum dots (QDs) are of great concern in many fields. However, they suffer from high toxicity and may lead to environmental pollution. We report the development of a QD-vitrimer composite with reprocessable, self-healable, and sustainable properties. Our QD-vitrimer composite reveals fine transparency and highly uniform QDs distribution without significant aggregation. The photoluminescence quantum yield (PLQY) is basically about four times higher than the commercial QD films. The QD-vitrimer composites can be recycled at least three times without any significant loss in structure and luminescence efficiency. A prototype light-emitting diode device is fabricated to demonstrate the promising potential of QD-vitrimer composites in real application. This research sheds light on developing environmentally friendly luminescent materials and opens up an avenue for designing advanced nanomaterials-vitrimer composites.
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Affiliation(s)
- Yong-Yun Zhang
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan (R.O.C
- Research Center for Applied Sciences, Academia Sinica, No. 128, Sec. 2, Academia Rd., Nankang, Taipei, 11529, Taiwan (R.O.C
| | - Kuan-Ting Liu
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan (R.O.C
| | - Mu-Huai Fang
- Research Center for Applied Sciences, Academia Sinica, No. 128, Sec. 2, Academia Rd., Nankang, Taipei, 11529, Taiwan (R.O.C
| | - Man-Kit Leung
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan (R.O.C
- Advanced Research Center for Green Materials Science and Technology, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan (R.O.C
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5
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Fang MH, Bao Z, Huang WT, Liu RS. Evolutionary Generation of Phosphor Materials and Their Progress in Future Applications for Light-Emitting Diodes. Chem Rev 2022; 122:11474-11513. [DOI: 10.1021/acs.chemrev.1c00952] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Mu-Huai Fang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Zhen Bao
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Wen-Tse Huang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Ru-Shi Liu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
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6
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Rajendran V, Fang MH, Huang WT, Majewska N, Lesniewski T, Mahlik S, Leniec G, Kaczmarek SM, Pang WK, Peterson VK, Lu KM, Chang H, Liu RS. Chromium Ion Pair Luminescence: A Strategy in Broadband Near-Infrared Light-Emitting Diode Design. J Am Chem Soc 2021; 143:19058-19066. [PMID: 34735772 DOI: 10.1021/jacs.1c08334] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Portable near-infrared (NIR) light sources are in high demand for applications in spectroscopy, night vision, bioimaging, and many others. Typical phosphor designs feature isolated Cr3+ ion centers, and it is challenging to design broadband NIR phosphors based on Cr3+-Cr3+ pairs. Here, we explore the solid-solution series SrAl11.88-xGaxO19:0.12Cr3+ (x = 0, 2, 4, 6, 8, 10, and 12) as phosphors featuring Cr3+-Cr3+ pairs and evaluate structure-property relations within the series. We establish the incorporation of Ga within the magentoplumbite-type structure at five distinct crystallographic sites and evaluate the effect of this incorporation on the Cr3+-Cr3+ ion pair proximity. Electron paramagnetic measurements reveal the presence of both isolated Cr3+ and Cr3+-Cr3+ pairs, resulting in NIR luminescence at approximately 650-1050 nm. Unexpectedly, the origin of broadband NIR luminescence with a peak within the range 740-820 nm is related to the Cr3+-Cr3+ ion pair. We demonstrate the application of the SrAl5.88Ga6O19:0.12Cr3+ phosphor, which possesses an internal quantum efficiency of ∼85%, a radiant flux of ∼95 mW, and zero thermal quenching up to 500 K. This work provides a further understanding of spectral shifts in phosphor solid solutions and in particular the application of the magentoplumbites as promising next-generation NIR phosphor host systems.
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Affiliation(s)
- Veeramani Rajendran
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.,Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 106, Taiwan
| | - Mu-Huai Fang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Wen-Tse Huang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Natalia Majewska
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Wita Stwosza 57, 80-308 Gdańsk, Poland
| | - Tadeusz Lesniewski
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Wita Stwosza 57, 80-308 Gdańsk, Poland
| | - Sebastian Mahlik
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Wita Stwosza 57, 80-308 Gdańsk, Poland
| | - Grzegorz Leniec
- Department of Technical Physics, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology Szczecin, al. Piastow 48, 70-311 Szczecin, Poland
| | - Slawomir M Kaczmarek
- Department of Technical Physics, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology Szczecin, al. Piastow 48, 70-311 Szczecin, Poland
| | - Wei Kong Pang
- Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, North Wollongong, New South Wales 2522, Australia
| | - Vanessa K Peterson
- Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, North Wollongong, New South Wales 2522, Australia.,Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Sydney, New South Wales 2232, Australia
| | - Kuang-Mao Lu
- Everlight Electronics Co., Ltd., New Taipei City 238, Taiwan
| | - Ho Chang
- Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 106, Taiwan
| | - Ru-Shi Liu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
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7
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Bao Z, Hsiu CY, Fang MH, Majewska N, Sun W, Huang SJ, Yuan ECY, Chang YC, Chan JCC, Mahlik S, Zhou W, Yang CW, Lu KM, Liu RS. Formation and Near-Infrared Emission of CsPbI 3 Nanoparticles Embedded in Cs 4PbI 6 Crystals. ACS Appl Mater Interfaces 2021; 13:34742-34751. [PMID: 34264640 DOI: 10.1021/acsami.1c08920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Cs4PbI6, as a rarely investigated member of the Cs4PbX6 (X is a halogen element) family, has been successfully synthesized at low temperatures, and the synthetic conditions have been optimized. Metal iodides such as LiI, KI, NiI2, CoI2, and ZnI2, as additives, play an important role in enhancing the formation of the Cs4PbI6 microcrystals. ZnI2 with the lowest dissociation energy is the most efficient additive to supply iodide ions, and its amount of addition has also been optimized. Strong red to near-infrared (NIR) emission properties have been detected, and its optical emission centers have been identified to be numerous embedded perovskite-type α-CsPbI3 nanocrystallites (∼5 nm in diameter) based on investigations of temperature- and pressure-dependent photoluminescent properties. High-resolution transmission electron microscopy was used to detect these hidden nanoparticles, although the material was highly beam-sensitive and confirmed a "raisin bread"-like structure of the Cs4PbI6 crystals. A NIR mini-LED for the biological application has been successfully fabricated using as-synthesized Cs4PbI6 crystals. This work provides information for the future development of infrared fluorescent nanoscale perovskite materials.
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Affiliation(s)
- Zhen Bao
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Chiao-Yin Hsiu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Mu-Huai Fang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Natalia Majewska
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Gdańsk 80-308, Poland
| | - Weihao Sun
- School of Chemistry, University of St Andrews, St Andrews KY16 9ST, United Kingdom
| | - Shing-Jong Huang
- Instrumentation Center, National Taiwan University, Taipei 106, Taiwan
| | | | - Yu-Chun Chang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | | | - Sebastian Mahlik
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Gdańsk 80-308, Poland
| | - Wuzong Zhou
- School of Chemistry, University of St Andrews, St Andrews KY16 9ST, United Kingdom
| | - Chia-Wei Yang
- Everlight Electronics Co., Ltd., New Taipei City 238, Taiwan
| | - Kuang-Mao Lu
- Everlight Electronics Co., Ltd., New Taipei City 238, Taiwan
| | - Ru-Shi Liu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
- Advanced Research Center of Green Materials Science and Technology, National Taiwan University, Taipei 106, Taiwan
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8
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Guzman GNAD, Rajendran V, Bao Z, Fang MH, Pang WK, Mahlik S, Lesniewski T, Grinberg M, Molokeev MS, Leniec G, Kaczmarek SM, Ueda J, Lu KM, Hu SF, Chang H, Liu RS. Multi-Site Cation Control of Ultra-Broadband Near-Infrared Phosphors for Application in Light-Emitting Diodes. Inorg Chem 2020; 59:15101-15110. [PMID: 32998510 DOI: 10.1021/acs.inorgchem.0c02055] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Near-infrared (NIR) phosphors are fascinating materials that have numerous applications in diverse fields. In this study, a series of La3Ga5GeO14:Cr3+ phosphors, which was incorporated with Sn4+, Ba2+, and Sc3+, was successfully synthesized using solid-state reaction to explore every cationic site comprehensively. The crystal structures were well resolved by combining synchrotron X-ray diffraction and neutron powder diffraction through joint Rietveld refinements. The trapping of free electrons induced by charge unbalances and lattice vacancies changes the magnetic properties, which was well explained by a Dyson curve in electron paramagnetic resonance. Temperature and pressure-dependent photoluminescence spectra reveal various luminescent properties between strong and weak fields in different dopant centers. The phosphor-converted NIR light-emitting diode (pc-NIR LED) package demonstrates a superior broadband emission that covers the near-infrared (NIR) region of 650-1050 nm. This study can provide researchers with new insight into the control mechanism of multiple-cation-site phosphors and reveal a potential phosphor candidate for practical NIR LED application.
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Affiliation(s)
| | - Veeramani Rajendran
- Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 106, Taiwan
| | - Zhen Bao
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Mu-Huai Fang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Wei-Kong Pang
- Institute for Superconducting & Electronic Materials, Faculty of Engineering, University of Wollongong, Wollongong 2522, Australia
| | - Sebastian Mahlik
- Institute of Experimental Physics, Faculty of Mathematic, Physics and Informatics, University of Gdańsk, Wita Stwosza 57, 80-308 Gdańsk, Poland
| | - Tadeusz Lesniewski
- Institute of Experimental Physics, Faculty of Mathematic, Physics and Informatics, University of Gdańsk, Wita Stwosza 57, 80-308 Gdańsk, Poland
| | - Marek Grinberg
- Institute of Experimental Physics, Faculty of Mathematic, Physics and Informatics, University of Gdańsk, Wita Stwosza 57, 80-308 Gdańsk, Poland
| | - Maxim S Molokeev
- Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia.,Siberian Federal University, Krasnoyarsk 60041, Russia.,Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia
| | - Grzegorz Leniec
- Institute of Physics, Department of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Szczecin, al. Piastow 48, 70-311 Szczecin, Poland
| | - Slawomir M Kaczmarek
- Institute of Physics, Department of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Szczecin, al. Piastow 48, 70-311 Szczecin, Poland
| | - Jumpei Ueda
- Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
| | - Kuang-Mao Lu
- Everlight Electronics Co., Ltd., New Taipei City 238, Taiwan
| | - Shu-Fen Hu
- Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan
| | - Ho Chang
- Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 106, Taiwan
| | - Ru-Shi Liu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
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9
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Fang MH, Chen PY, Bao Z, Majewska N, Leśniewski T, Mahlik S, Grinberg M, Sheu HS, Lee JF, Liu RS. Broadband NaK 2Li[Li 3SiO 4] 4:Ce Alkali Lithosilicate Blue Phosphors. J Phys Chem Lett 2020; 11:6621-6625. [PMID: 32787229 DOI: 10.1021/acs.jpclett.0c02064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Phosphors with a rigid and symmetrical structure are urgently needed. The alkali lithosilicate family (A[Li3SiO4]) has been extensively studied with a narrow emission band due to its unique cuboid-coordinated environment and rigid structure. However, here we demonstrate for the first time Ce-doped NaK2Li[Li3SiO4]4 phosphors with a broad emission band, a high internal quantum efficiency (85.6%), and excellent thermal stability. Photoluminescence indicates the Ce's preference to occupy the Na+ site, leading to a strong blue color emission with peak maxima at 417 and 450 nm. Temperature- and pressure-dependent photoluminescence reveals thermal stability and a phase transition. Moreover, the X-ray absorption near-edge structure reveals the mixing of Ce3+ and Ce4+ in the materials; this result differs from that of Eu2+-doped A[Li3SiO4] phosphors. The charge compensation process is then proposed to explain this difference. This study not only provides insights into Ce-doped UCr4C4-type phosphors but also explains the charge compensation mechanism of the aliovalent doping process.
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Affiliation(s)
- Mu-Huai Fang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Po-Yen Chen
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Zhen Bao
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Natalia Majewska
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Gdańsk University, Wita Stwosza 57, 80-308 Gdańsk, Poland
| | - Tadeusz Leśniewski
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Gdańsk University, Wita Stwosza 57, 80-308 Gdańsk, Poland
| | - Sebastian Mahlik
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Gdańsk University, Wita Stwosza 57, 80-308 Gdańsk, Poland
| | - Marek Grinberg
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Gdańsk University, Wita Stwosza 57, 80-308 Gdańsk, Poland
| | - Hwo-Shuenn Sheu
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - Jyh-Fu Lee
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - Ru-Shi Liu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
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10
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Lee C, Bao Z, Fang MH, Lesniewski T, Mahlik S, Grinberg M, Leniec G, Kaczmarek SM, Brik MG, Tsai YT, Tsai TL, Liu RS. Chromium(III)-Doped Fluoride Phosphors with Broadband Infrared Emission for Light-Emitting Diodes. Inorg Chem 2019; 59:376-385. [DOI: 10.1021/acs.inorgchem.9b02630] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Chi Lee
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Zhen Bao
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Mu-Huai Fang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Tadeusz Lesniewski
- Institute of Experimental Physics, Faculty of Mathematic, Physics and Informatics, University of Gdansk, 80-308 Gdansk, Poland
| | - Sebastian Mahlik
- Institute of Experimental Physics, Faculty of Mathematic, Physics and Informatics, University of Gdansk, 80-308 Gdansk, Poland
| | - Marek Grinberg
- Institute of Experimental Physics, Faculty of Mathematic, Physics and Informatics, University of Gdansk, 80-308 Gdansk, Poland
| | - Grzegorz Leniec
- Institute of Physics, Department of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology Szczecin al. Piastow 48, 70-311 Szczecin, Poland
| | - Sławomir M. Kaczmarek
- Institute of Physics, Department of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology Szczecin al. Piastow 48, 70-311 Szczecin, Poland
| | - Mikhail G. Brik
- College of Sciences, Chongqing University of Posts and Telecommunications, Chongqing 400065, People’s Republic of China
- Institute of Physics, University of Tartu, W. Ostwald Strasse 1, Tartu 50411, Estonia
- Institute of Physics, Jan Dlugosz University, Armii Krajowej 13/15, PL-42200 Czestochowa, Poland
| | | | | | - Ru-Shi Liu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
- Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 106, Taiwan
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11
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Fang MH, Mahlik S, Lazarowska A, Grinberg M, Molokeev MS, Sheu HS, Lee JF, Liu RS. Structural Evolution and Effect of the Neighboring Cation on the Photoluminescence of Sr(LiAl 3 ) 1-x (SiMg 3 ) x N 4 :Eu 2+ Phosphors. Angew Chem Int Ed Engl 2019; 58:7767-7772. [PMID: 30957924 DOI: 10.1002/anie.201903178] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Indexed: 11/05/2022]
Abstract
In this study, a series of Sr(LiAl3 )1-x (SiMg3 )x N4 :Eu2+ (SLA-SSM) phosphors were synthesized by a solid-solution process. The emission peak maxima of SLA-SSM range from 615 nm to 680 nm, which indicates structural differences in these materials. 7 Li solid-state NMR spectroscopy was utilized to distinguish between the Li(1)N4 and Li(2)N4 tetrahedra in SLA-SSM. Differences in the coordination environments of the two Sr sites were found which explain the unexpected luminescent properties. Three discernible morphologies were detected by scanning electron microscopy. Temperature-dependent photoluminescence and decay times were used to understand the diverse environments of europium ions in the two strontium sites Sr1 and Sr2, which also support the NMR analysis. Moreover, X-ray absorption near-edge structure studies reveal that the Eu2+ concentration in SLA-SSM is much higher than that in in SrLiAl3 N4 :Eu2+ and SrSiMg3 N4 :Eu2+ phosphors. Finally, an overall mechanism was proposed to explain the how the change in photoluminescence is controlled by the size of the coordinated cation.
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Affiliation(s)
- Mu-Huai Fang
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Sebastian Mahlik
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Gdańsk University, Wita Stwosza 57, 80-308, Gdańsk, Poland
| | - Agata Lazarowska
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Gdańsk University, Wita Stwosza 57, 80-308, Gdańsk, Poland
| | - Marek Grinberg
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Gdańsk University, Wita Stwosza 57, 80-308, Gdańsk, Poland
| | - Maxim S Molokeev
- Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia.,Siberian Federal University, Krasnoyarsk, 660041, Russia.,Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russia
| | - Hwo-Shuenn Sheu
- National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan
| | - Jyh-Fu Lee
- National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan
| | - Ru-Shi Liu
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan.,Department of Mechanical Engineering, and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei, 106, Taiwan
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12
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Fang MH, Hsu CS, Su C, Liu W, Wang YH, Liu RS. Integrated Surface Modification to Enhance the Luminescence Properties of K 2TiF 6:Mn 4+ Phosphor and Its Application in White-Light-Emitting Diodes. ACS Appl Mater Interfaces 2018; 10:29233-29237. [PMID: 30129360 DOI: 10.1021/acsami.8b12170] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Narrow-band Mn4+-doped fluoride phosphors have become a research hotspot worldwide. In this study, we propose integrated surface modification processes to enhance the performance and stability of the luminescence properties of K2TiF6:Mn4+ (KTF) phosphor. These integrated process are applied in the initial synthesis step, coating of the as-synthesized powder post-treatment process, and during the application of the phosphor in the white-light-emitting diode (WLED) device. Surface etching is conducted to remove impurities and small particles in KTF. Double-shell coating forms a stable protective layer outside the KTF. Atomic layer deposition is employed for the surface of the WLED device.
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Affiliation(s)
- Mu-Huai Fang
- Department of Chemistry , National Taiwan University , Taipei 106 , Taiwan
| | | | | | - Wenjing Liu
- Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education, School of Physical Science and Technology , Lanzhou University , Lanzhou 730000 , China
| | - Yu-Hua Wang
- Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education, School of Physical Science and Technology , Lanzhou University , Lanzhou 730000 , China
| | - Ru-Shi Liu
- Department of Chemistry , National Taiwan University , Taipei 106 , Taiwan
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13
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Zhou W, Fang MH, Lian S, Liu RS. Ultrafast Self-Crystallization of High-External-Quantum-Efficient Fluoride Phosphors for Warm White Light-Emitting Diodes. ACS Appl Mater Interfaces 2018; 10:17508-17511. [PMID: 29749227 DOI: 10.1021/acsami.8b03525] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this study, we used HF (as good solvent) to dissolve K2GeF6 and K2MnF6 and added ethanol (as poor solvent) to cause ultrafast self-crystallization of K2GeF6:Mn4+ crystals, which had an unprecedentedly high external quantum efficiency that reached 73%. By using the red phosphor, we achieved a high-quality warm white light-emitting diode with color-rendering index of Ra = 94, R9 = 95, luminous efficacy of 150 lm W-1, and correlated color temperature at 3652 K. Furthermore, the good-poor solvent strategy can be used to fast synthesize other fluorides.
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Affiliation(s)
- Wenli Zhou
- Department of Chemistry , National Taiwan University , Taipei 106 , Taiwan
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, College of Chemistry and Chemical Engineering , Hunan Normal University , Changsha 410081 , China
| | - Mu-Huai Fang
- Department of Chemistry , National Taiwan University , Taipei 106 , Taiwan
| | - Shixun Lian
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, College of Chemistry and Chemical Engineering , Hunan Normal University , Changsha 410081 , China
| | - Ru-Shi Liu
- Department of Chemistry , National Taiwan University , Taipei 106 , Taiwan
- Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology , National Taipei University of Technology , Taipei 106 , Taiwan
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14
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Fang MH, Wu WL, Jin Y, Lesniewski T, Mahlik S, Grinberg M, Brik MG, Srivastava AM, Chiang CY, Zhou W, Jeong D, Kim SH, Leniec G, Kaczmarek SM, Sheu HS, Liu RS. Control of Luminescence by Tuning of Crystal Symmetry and Local Structure in Mn4+
-Activated Narrow Band Fluoride Phosphors. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201708814] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mu-Huai Fang
- Department of Chemistry; National Taiwan University; Taipei 106 Taiwan
| | - Wei-Lun Wu
- Department of Chemistry; National Taiwan University; Taipei 106 Taiwan
| | - Ye Jin
- Department of Chemistry; National Taiwan University; Taipei 106 Taiwan
- School of Science; Chongqing University of Technology; Chongqing 400054 China
| | - Tadeusz Lesniewski
- Institute of Experimental Physics; Faculty of Mathematics, Physics and Informatics; University of Gdańsk; Gdansk, Wita Stwosza 57 80-308 Gdansk Poland
| | - Sebastian Mahlik
- Institute of Experimental Physics; Faculty of Mathematics, Physics and Informatics; University of Gdańsk; Gdansk, Wita Stwosza 57 80-308 Gdansk Poland
| | - Marek Grinberg
- Institute of Experimental Physics; Faculty of Mathematics, Physics and Informatics; University of Gdańsk; Gdansk, Wita Stwosza 57 80-308 Gdansk Poland
| | - Mikhail G. Brik
- College of Sciences; Chongqing University of Posts and Telecommunications; Chongqing 400065 China
- Institute of Physics; University of Tartu; Tartu 50411 Estonia
- Institute of Physics; Jan Dlugosz University; Czestochowa 42200 Poland
| | | | - Chang-Yang Chiang
- EaStCHEM; School of Chemistry; University of St Andrews; St Andrews KY16 9ST UK
| | - Wuzong Zhou
- EaStCHEM; School of Chemistry; University of St Andrews; St Andrews KY16 9ST UK
| | - Donghyuk Jeong
- Western Seoul Center; Korea Basic Science Institute; University-Industry Cooperation Building; Seoul 120-140 Korea
| | - Sun Hee Kim
- Western Seoul Center; Korea Basic Science Institute; University-Industry Cooperation Building; Seoul 120-140 Korea
| | - Grzegorz Leniec
- Institute of Physics; Department of Mechanical Engineering and Mechatronics; West Pomeranian University of Technology Szczecin; al. Piastow 48 70-311 Szczecin Poland
| | - Slawomir M. Kaczmarek
- Institute of Physics; Department of Mechanical Engineering and Mechatronics; West Pomeranian University of Technology Szczecin; al. Piastow 48 70-311 Szczecin Poland
| | - Hwo-Shuenn Sheu
- National Synchrotron Radiation Research Center; Hsinchu 300 Taiwan
| | - Ru-Shi Liu
- Department of Chemistry; National Taiwan University; Taipei 106 Taiwan
- Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology; National Taipei University of Technology; Taipei 106 Taiwan
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15
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Fang MH, Wu WL, Jin Y, Lesniewski T, Mahlik S, Grinberg M, Brik MG, Srivastava AM, Chiang CY, Zhou W, Jeong D, Kim SH, Leniec G, Kaczmarek SM, Sheu HS, Liu RS. Control of Luminescence by Tuning of Crystal Symmetry and Local Structure in Mn 4+ -Activated Narrow Band Fluoride Phosphors. Angew Chem Int Ed Engl 2018; 57:1797-1801. [PMID: 29266619 DOI: 10.1002/anie.201708814] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2017] [Revised: 12/13/2017] [Indexed: 11/09/2022]
Abstract
Mn4+ -doped fluoride phosphors have been widely used in wide-gamut backlighting devices because of their extremely narrow emission band. Solid solutions of Na2 (Six Ge1-x )F6 :Mn4+ and Na2 (Gey Ti1-y )F6 :Mn4+ were successfully synthesized to elucidate the behavior of the zero-phonon line (ZPL) in different structures. The ratio between ZPL and the highest emission intensity υ6 phonon sideband exhibits a strong relationship with luminescent decay rate. First-principles calculations are conducted to model the variation in the structural and electronic properties of the prepared solid solutions as a function of the composition. To compensate for the limitations of the Rietveld refinement, electron paramagnetic resonance and high-resolution steady-state emission spectra are used to confirm the diverse local environment for Mn4+ in the structure. Finally, the spectral luminous efficacy of radiation (LER) is used to reveal the important role of ZPL in practical applications.
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Affiliation(s)
- Mu-Huai Fang
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Wei-Lun Wu
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Ye Jin
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan.,School of Science, Chongqing University of Technology, Chongqing, 400054, China
| | - Tadeusz Lesniewski
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Gdansk, Wita Stwosza 57, 80-308, Gdansk, Poland
| | - Sebastian Mahlik
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Gdansk, Wita Stwosza 57, 80-308, Gdansk, Poland
| | - Marek Grinberg
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk, Gdansk, Wita Stwosza 57, 80-308, Gdansk, Poland
| | - Mikhail G Brik
- College of Sciences, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China.,Institute of Physics, University of Tartu, Tartu, 50411, Estonia.,Institute of Physics, Jan Dlugosz University, Czestochowa, 42200, Poland
| | | | - Chang-Yang Chiang
- EaStCHEM, School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, UK
| | - Wuzong Zhou
- EaStCHEM, School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, UK
| | - Donghyuk Jeong
- Western Seoul Center, Korea Basic Science Institute, University-Industry Cooperation Building, Seoul, 120-140, Korea
| | - Sun Hee Kim
- Western Seoul Center, Korea Basic Science Institute, University-Industry Cooperation Building, Seoul, 120-140, Korea
| | - Grzegorz Leniec
- Institute of Physics, Department of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology Szczecin, al. Piastow 48, 70-311, Szczecin, Poland
| | - Slawomir M Kaczmarek
- Institute of Physics, Department of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology Szczecin, al. Piastow 48, 70-311, Szczecin, Poland
| | - Hwo-Shuenn Sheu
- National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan
| | - Ru-Shi Liu
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan.,Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei, 106, Taiwan
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16
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Lin CC, Tsai YT, Johnston HE, Fang MH, Yu F, Zhou W, Whitfield P, Li Y, Wang J, Liu RS, Attfield JP. Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors. J Am Chem Soc 2017; 139:11766-11770. [DOI: 10.1021/jacs.7b04338] [Citation(s) in RCA: 149] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chun Che Lin
- Department
of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Yi-Ting Tsai
- Department
of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Hannah E. Johnston
- Centre
for Science at Extreme Conditions and School of Chemistry, University of Edinburgh, King’s Buildings, Mayfield Road, EH9 3JZ Edinburgh, U.K
| | - Mu-Huai Fang
- Department
of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Fengjiao Yu
- School
of Chemistry, University of St Andrews, St Andrews, Fife KY16
9ST, U.K
| | - Wuzong Zhou
- School
of Chemistry, University of St Andrews, St Andrews, Fife KY16
9ST, U.K
| | - Pamela Whitfield
- Chemical
and Engineering Materials Division, Oak Ridge National Laboratory, Oak
Ridge, Tennessee 37831, United States
| | - Ye Li
- MOE Key Laboratory
of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic
Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510275, China
| | - Jing Wang
- MOE Key Laboratory
of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic
Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510275, China
| | - Ru-Shi Liu
- Department
of Chemistry, National Taiwan University, Taipei 106, Taiwan
- Department
of Mechanical Engineering and Graduate Institute of Manufacturing
Technology, National Taipei University of Technology, Taipei 106, Taiwan
| | - J. Paul Attfield
- Centre
for Science at Extreme Conditions and School of Chemistry, University of Edinburgh, King’s Buildings, Mayfield Road, EH9 3JZ Edinburgh, U.K
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17
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Zhang N, Tsai YT, Fang MH, Ma CG, Lazarowska A, Mahlik S, Grinberg M, Chiang CY, Zhou W, Lin JG, Lee JF, Zheng J, Guo C, Liu RS. Aluminate Red Phosphor in Light-Emitting Diodes: Theoretical Calculations, Charge Varieties, and High-Pressure Luminescence Analysis. ACS Appl Mater Interfaces 2017; 9:23995-24004. [PMID: 28605911 DOI: 10.1021/acsami.7b06840] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Searching for a non-rare-earth-based oxide red-emitting phosphor is crucial for phosphor-converted light-emitting diodes (LEDs). In this study, we optimized a blue and UV-light excited Sr4Al14O25:Mn phosphor exhibiting red emission peaked at ∼653 nm, which was successfully synthesized by solid-state reaction. The crystal structure, micromorphology, and luminescent properties of Sr4Al14O25:Mn phosphors were characterized by X-ray Rietveld refinement, high-resolution transmission electron microscopy, and photoluminescence spectra. The band gap and electronic structure of Sr4Al14O25 were analyzed by density functional theory calculations using the hybrid exchange-correlation functional. The crystal field environment effect of Al sites from introducing activator Mn ions was investigated with the aid of Raman 27Al nuclear magnetic resonance spectra and electron spin resonance. The pressure dependent luminescent properties and decay time of this compound were presented. The tricolor display spectrum by combining blue InGaN chips, commercial β-SiAlON:Eu2+ green phosphor, and Sr4Al14O25:Mn red phosphor were evaluated for commercial applications: using the present Sr4Al14O25:Mn red phosphor converted LED as a backlighting source.
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Affiliation(s)
- Niumiao Zhang
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
- Institute of Photonics and Photon-Technology, Northwest University , Xi'an 710069, China
| | - Yi-Ting Tsai
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
| | - Mu-Huai Fang
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
| | - Chong-Geng Ma
- College of Sciences, Chongqing University of Posts and Telecommunications , Chongqing 400065, China
| | - Agata Lazarowska
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdansk , Wita Stwosza 57, 80-308 Gdansk, Poland
| | - Sebastian Mahlik
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdansk , Wita Stwosza 57, 80-308 Gdansk, Poland
| | - Marek Grinberg
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdansk , Wita Stwosza 57, 80-308 Gdansk, Poland
| | - Chang-Yang Chiang
- EaStCHEM, School of Chemistry, University of St. Andrews , St. Andrews, KY169ST, United Kingdom
| | - Wuzong Zhou
- EaStCHEM, School of Chemistry, University of St. Andrews , St. Andrews, KY169ST, United Kingdom
| | - Jauyn Grace Lin
- Center for Condensed Matter Sciences, National Taiwan University , Taipei 106, Taiwan
| | - Jyh-Fu Lee
- National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan
| | - Jiming Zheng
- Institute of Photonics and Photon-Technology, Northwest University , Xi'an 710069, China
| | - Chongfeng Guo
- Institute of Photonics and Photon-Technology, Northwest University , Xi'an 710069, China
| | - Ru-Shi Liu
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
- Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology , Taipei 106, Taiwan
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18
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Fang MH, Ni C, Zhang X, Tsai YT, Mahlik S, Lazarowska A, Grinberg M, Sheu HS, Lee JF, Cheng BM, Liu RS. Enhance Color Rendering Index via Full Spectrum Employing the Important Key of Cyan Phosphor. ACS Appl Mater Interfaces 2016; 8:30677-30682. [PMID: 27802017 DOI: 10.1021/acsami.6b10233] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A new concept called "full-spectrum lighting" has attracted considerable attention in recent years. Traditional devices are usually combined with ultraviolet-light-emitting diode (LED), red, green, and blue phosphors. However, a cyan cavity exists in the 480-520 nm region. Hence, cyan phosphors are needed to compensate for the cavity. (Sr,Ba)5(PO4)3Cl:Eu2+ phosphors feature an extremely unique and tunable photoluminescence spectrum. Nevertheless, the tuning mechanisms of these phosphors remain unclear. In this study, we elucidate the mechanism of the cation size-controlled activator uneven-occupation and reoxidation in (Sr,Ba)5(PO4)3Cl:Eu2+ phosphors. This mechanism could help tune the optical properties of related apatite families and structures with multiple cation sites and strongly uneven occupation of activators and cations. Finally, the package of the LED device is constructed to show that both color rendering index Ra and R9 are higher than 95. Thus, the device could be a potential candidate for full-spectrum lighting.
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Affiliation(s)
- Mu-Huai Fang
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
| | - Chenchen Ni
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
| | - Xuejie Zhang
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
| | - Yi-Ting Tsai
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
| | - Sebastian Mahlik
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk , 80-308 Gdańsk, Poland
| | - Agata Lazarowska
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk , 80-308 Gdańsk, Poland
| | - Marek Grinberg
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk , 80-308 Gdańsk, Poland
| | - Hwo-Shuenn Sheu
- National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan
| | - Jyh-Fu Lee
- National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan
| | - Bing-Ming Cheng
- National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan
| | - Ru-Shi Liu
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
- Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology , Taipei 106, Taiwan
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19
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Jin Y, Fang MH, Grinberg M, Mahlik S, Lesniewski T, Brik MG, Luo GY, Lin JG, Liu RS. Narrow Red Emission Band Fluoride Phosphor KNaSiF6:Mn(4+) for Warm White Light-Emitting Diodes. ACS Appl Mater Interfaces 2016; 8:11194-203. [PMID: 27104357 DOI: 10.1021/acsami.6b01905] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Red phosphors AMF6:Mn(4+) (A = Na, K, Cs, Ba, Rb; M = Si, Ti, Ge) have been widely studied due to the narrow red emission bands around 630 nm. The different emission of the zero-phonon line (ZPL) may affect the color rendering index of white light-emitting diodes (WLED). The primary reason behind the emergence and intensity of ZPL, taking KNaSiF6:Mn(4+) as an example, was investigated here. The effects of pressure on crystal structure and luminescence were determined experimentally and theoretically. The increase of band gap, red shift of emission spectrum and blue shift of excitation spectrum were observed with higher applied pressure. The angles of ∠FMnF and ∠FMF(M = Si, Ti, Ge) were found clearly distorted from 180° in MF6(2-) octahedron with strong ZPL intensity. The larger distorted SiF6(2-) octahedron, the stronger ZPL intensity. This research provides a new perspective to address the ZPL intensity problem of the hexafluorosilicate phosphors caused by crystal distortion and pressure-dependence of the luminescence. The efficacy of the device featuring from Y3Al5O12:Ce(3+) (YAG) and KNaSiF6:Mn(4+) phosphor was 118 lm/W with the color temperature of 3455 K. These results reveal that KNaSiF6:Mn(4+) presents good luminescent properties and could be a potential candidate material for application in back-lighting systems.
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Affiliation(s)
- Ye Jin
- School of Optoelectronic Information, Chongqing University of Technology , Chongqing 400054, China
| | | | - Marek Grinberg
- Institute of Experimental Physics, University of Gdańsk , 80-952 Gdańsk, Poland
| | - Sebastian Mahlik
- Institute of Experimental Physics, University of Gdańsk , 80-952 Gdańsk, Poland
| | - Tadeusz Lesniewski
- Institute of Experimental Physics, University of Gdańsk , 80-952 Gdańsk, Poland
| | - M G Brik
- College of Sciences, Chongqing University of Posts and Telecommunications , Chongqing 400065, China
- Institute of Physics, University of Tartu , Tartu 50411, Estonia
- Institute of Physics, Jan Dlugosz University , Czestochowa PL-42200, Poland
| | | | | | - Ru-Shi Liu
- Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology , Taipei 106, Taiwan
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20
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Wei LL, Lin CC, Wang YY, Fang MH, Jiao H, Liu RS. Photoluminescent Evolution Induced by Structural Transformation Through Thermal Treating in the Red Narrow-Band Phosphor K₂GeF₆:Mn⁴⁺. ACS Appl Mater Interfaces 2015; 7:10656-9. [PMID: 25961499 DOI: 10.1021/acsami.5b02212] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This study explored optimal preparation conditions for K2GeF6:Mn(4+) red phosphors by using chemical coprecipitation method. The prepared hexagonal P3̅m1 K2GeF6:Mn(4+) exhibited efficient red emission, high color purity, good Mn(4+) concentration stability, and low thermal quenching. Structural evolution from hexagonal P3̅m1 to P63mc and then P63mc to cubic Fm3m occurred after thermal treatment at approximately 400 and 500 °C, respectively. Hexagonal P63mc phase showed an obvious zero phonon line peak at 621 nm, whereas cubic Fm3m phase showed no red emission. Yellowish K2GeF6:Mn(4+) with both hexagonal P3̅m1 and P63mc symmetries are promising commercial red phosphors for white light-emitting diodes.
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Affiliation(s)
- Ling-Ling Wei
- †School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, Shaanxi, P.R. China
| | - Chun Che Lin
- ‡Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Yi-Ying Wang
- †School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, Shaanxi, P.R. China
| | - Mu-Huai Fang
- ‡Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Huan Jiao
- †School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, Shaanxi, P.R. China
| | - Ru-Shi Liu
- ‡Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
- §Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 106, Taiwan
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21
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Lin JX, Zhan SL, Fang MH, Qian XQ, Yang H. Adsorption of basic dye from aqueous solution onto fly ash. J Environ Manage 2008; 87:193-200. [PMID: 17307284 DOI: 10.1016/j.jenvman.2007.01.001] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2006] [Revised: 12/17/2006] [Accepted: 01/10/2007] [Indexed: 05/14/2023]
Abstract
The fly ash treated by H2SO4 was used as a low-cost adsorbent for the removal of a typical dye, methylene blue, from aqueous solution. An increase in the specific surface area and dye-adsorption capacity was observed after the acid treatment. The adsorption isotherm and kinetics of the treated fly ash were studied. The experimental results were fitted using Langmuir and Freundlich isotherms. It shows that the Freundlich isotherm is better in describing the adsorption process. Two kinetic models, pseudo-first order and pseudo-second order, were employed to analyze the kinetic data. It was found that the pseudo-second-order model is the better choice to describe the adsorption behavior. The thermodynamic study reveals that the enthalpy (delta H0) value is positive (5.63 kJ/mol), suggesting an endothermic nature of the adsorption.
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Affiliation(s)
- J X Lin
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, PR China; College of Materials and Chemical Engineering, Zhejiang University, Hangzhou 310027, PR China
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Fang MH, Ginsberg AL, Dobbins WO. Marked elevation in serum alkaline phosphatase activity as a manifestation of systemic infection. Gastroenterology 1980; 78:592-7. [PMID: 7351297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Jaundice of severe bacterial infection is well known. Marked elevation of the alkaline phosphatase has not previously been emphasized as a manifestation of severe bacterial infection. We report 4 patients with bacterial infection manifested chemically by a markedly elevated serum alkaline phosphatase and a minimally elevated serum bilirubin.
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