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Zuo C, Chen R, Jiang X, Leng Z, Yang Y, Zhang Z, Zhou L, Li C, Yang W, Lin H, Liu L, Li S, Zeng F, Su Z. A novel single-phase color tunable LiYGeO 4:Dy 3+, Eu 3+ phosphor exhibiting warm white light and excellent thermal stability. Phys Chem Chem Phys 2024; 26:3375-3388. [PMID: 38204322 DOI: 10.1039/d3cp04754g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2024]
Abstract
LiYGeO4 phosphors doped with Dy3+ and Eu3+ ions were synthesized using the solid phase method, and their color characteristics were adjustable. The bandgap value of LiYGeO4 calculated by diffuse reflection data is very close to the theoretical value of 3.669 eV, indicating that LiYGeO4 is an ideal candidate for doped rare earth activated ions. The analysis of the emission spectra and fluorescence attenuation curves of Dy3+ and Eu3+ co-doped LiYGeO4 phosphors revealed a clear energy transfer process: energy transfer from Dy3+ to Eu3+. Analysis of emission spectra and fluorescence attenuation curves revealed a transfer of energy from Dy3+ to Eu3+. This transfer mechanism is attributed to the dipole-dipole interactions. In addition, by constantly adjusting the doping levels of Dy3+ and Eu3+, a warm white phosphor with a color temperature of 3881 K was obtained. Finally, the emission intensity of the LiYGeO4:0.015Dy3+,0.02Eu3+ phosphor at 423 K was 86%, indicating that the phosphor has excellent thermal stability and 40% internal quantum efficiency, which proves the potential application of the LiYGeO4 phosphor in white light-emitting diodes (w-LEDs).
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Affiliation(s)
- Chunyu Zuo
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Rujia Chen
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Xiliang Jiang
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Zhuang Leng
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Yimin Yang
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Zhipeng Zhang
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Lingbo Zhou
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Chun Li
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Weiling Yang
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Hai Lin
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Lina Liu
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Shasha Li
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Fanming Zeng
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China
| | - Zhongmin Su
- Jilin University, Changchun 130012, P. R. China
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Zhang Q, Ding X, Liu B, Wang Y. A promising yellow-emitting langbeinite-type phosphor NaBaY 2(PO 4) 3:Eu 2+ for WLEDs. Dalton Trans 2024; 53:996-1003. [PMID: 38088051 DOI: 10.1039/d3dt03467d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2024]
Abstract
The development of novel phosphors with excellent luminescence properties for white light-emitting diodes (WLEDs) is always a formidable task. Compared with the traditional laborious and aimless "trial and error" experiments, a mineral-inspired prototype strategy can provide an efficient and accurate method. Herein, for the first time, a novel yellow-emitting phosphor NaBaY2(PO4)3:Eu2+ was discovered using the mineral-inspired prototype strategy and cation substitution method. The phosphor was prepared via the high-temperature solid-state reaction method, and its crystal structure, luminescence properties and potential application for WLEDs were systematically investigated. The NaBaY2(PO4)3 phase was derived from the K2Mg2(SO4)3-type mineral structure and a photoluminescence study revealed that the phosphor can emit bright yellow light with a maximum at 545 nm upon excitation at 351 nm. A WLED lamp was fabricated by the use of a blend of commercial blue-emitting BaMgAl10O17:Eu2+, yellow-emitting NaBaY2(PO4)3:Eu2+ and red-emitting (Ca, Sr)AlSiN3:Eu2+ phosphors with a 380 nm LED chip. The CIE, CCT, Ra and efficiency of the as-fabricated LEDs were measured to be equal to (0.366, 0.365), 4327 K, 91.2 and 40.8 lm W-1, respectively. These results suggest that NaBaY2(PO4)3:Eu2+ could be a promising candidate for n-UV WLEDs.
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Affiliation(s)
- Qiang Zhang
- School of Stomatology, Lanzhou University, Lanzhou, PR China.
- National and Local Joint Engineering Laboratory for Optical Conversion Materials and Technology of National Development and Reform Commission, Department of Materials Science, School of Materials and Energy, Lanzhou University, Lanzhou, PR China.
| | - Xin Ding
- College of Materials Science and Engineering, Qingdao University, Ningxia Road NO. 308, Qingdao 266071, PR China
| | - Bin Liu
- School of Stomatology, Lanzhou University, Lanzhou, PR China.
| | - Yuhua Wang
- National and Local Joint Engineering Laboratory for Optical Conversion Materials and Technology of National Development and Reform Commission, Department of Materials Science, School of Materials and Energy, Lanzhou University, Lanzhou, PR China.
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Singh K, Pradhan P, Priya S, Mund S, Vaidyanathan S. Recent progress in trivalent europium (Eu 3+)-based inorganic phosphors for solid-state lighting: an overview. Dalton Trans 2023; 52:13027-13057. [PMID: 37656121 DOI: 10.1039/d3dt00303e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Narrow band red-emitting phosphors are significant constituents but still a bottleneck for next-generation smart displays and high-performance lighting (solid-state lighting based white light-emitting diodes (WLEDs)) technology. This review emphasizes the fundamental understanding and comprehensive overview of the recent progress and challenges associated with inorganic phosphors or down (wavelength) convertors, providing special attention to narrowband red-emitting oxide phosphors for phosphor-converted WLEDs (pc-WLEDs). In this context, the comprehensive progress on trivalent europium (Eu3+, in scheelite and double perovskite structures) based oxide phosphors with special emphasis on structure-composition-property-correlations is briefly reviewed. Furthermore, the challenges faced in the design of new oxide red phosphors and strategies to improve their absorption, emission efficiency, and future research direction are highlighted.
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Affiliation(s)
- Kasturi Singh
- Department of Chemistry, National Institute of Technology Rourkela, India
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, India.
| | | | - Savita Priya
- Department of Chemistry, National Institute of Technology Rourkela, India
| | - Sibani Mund
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, India.
| | - Sivakumar Vaidyanathan
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, India.
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Li J, Lu YM, Yang QH, Yang CF, Chen CC, Houng MP. Effect of different temperatures to remove reduction gas on the photoluminescence properties of Eu-doped Li 2 (Ba 1-x Sr x )SiO 4 phosphors. LUMINESCENCE 2020; 36:20-27. [PMID: 32602601 DOI: 10.1002/bio.3910] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 06/14/2020] [Accepted: 06/26/2020] [Indexed: 01/09/2023]
Abstract
In this study, Eu-doped Li2 (Ba1-x Srx )SiO4 powders (x = 0, 0.2, 0.4, and 0.6) were synthesized at 850°C in a reduction atmosphere (5% H2 + 95% N2 ) for a duration of 1 h using a solid-state reaction method. The reduction atmosphere was infused as the synthesis temperature reached 850°C, and was removed as the temperature dropped to 800-500°C. Li2 (Ba1-x Srx )SiO4 (or Li2 BaSiO4 ), (Ba,Sr)2 SiO4 (or BaSiO4 ), and Li4 SiO4 phases co-existed in the synthesized Eu-doped Li2 (Ba1-x Srx )SiO4 powders. A new finding was that the reduction atmosphere removing (RAR) temperature of the Li2 (Ba1-x Srx )SiO4 phosphors had a large effect on their photoluminescence excitation (PLE) and PL properties. Except for the 800°C-RAR-treated Li2 BaSiO4 phosphor, PLE spectra of all other Li2 (Ba1-x Srx )SiO4 phosphors had one broad emission band with two emission peaks centred at ~242 and ~283 nm; these PL spectra had one broad emission band with one emission peak centred at 502-514 nm. We showed that the 800°C-RAR-treated Li2 BaSiO4 phosphor emitted a red light and all other Li2 (Ba1-x Srx )SiO4 phosphors emitted a green light. Reasons for these results are discussed thoroughly.
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Affiliation(s)
- Jie Li
- Department of Electrical Engineering, National University of Tainan, Tainan City, Taiwan
| | - Yang-Ming Lu
- Department of Electrical Engineering, National University of Tainan, Tainan City, Taiwan
| | - Qing-Hao Yang
- Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung, Taiwan
| | - Cheng-Fu Yang
- Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung, Taiwan.,Department of Aeronautical Engineering, Chaoyang University of Technology, Taichung, Taiwan
| | - Chih-Cheng Chen
- Department of Aeronautical Engineering, Chaoyang University of Technology, Taichung, Taiwan
| | - Mau-Phon Houng
- Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University, Tainan City, Taiwan
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