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Mao A, Guo Y, Zhou W, Lv P, Wang X, Lai L. Crystal Field Engineering Inducing Transformation from Narrow Band of Eu 3+ to Broadband of Eu 2. Inorg Chem 2024; 63:16134-16145. [PMID: 39034681 DOI: 10.1021/acs.inorgchem.4c00991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/23/2024]
Abstract
The complete transformation from narrow peak emission of Eu3+ to broadband emission of Eu2+ was first realized in La1-xSr2+xAl1-xSixO5:Eu series solutions relying on crystal field engineering and adjustment of synthesis parameters. The original red phosphor La0.97Sr2AlO5:0.03Eu3+peaks at 703 nm originated from 5D0 →7F4 transition of Eu3+ under 395 nm excitation. As the x value regularly increased, Sr2SiO4-type green phosphor La0.17Sr2.8Al0.2Si0.8O5:0.03Eu2+ was synthesized at x = 0.8, which can be efficiently excited by UV/blue light chips. Moreover, when x > 0.975, Sr3SiO5:Eu2+ type broadband orange phosphor Sr2.945Al0.025Si0.975O5:0.03Eu2+ with excellent thermal stability (91.3% peak intensity at 150 °C) was obtained. Variations in the crystal structure, phase, and luminescence properties were studied in detail. We hope this work can provide a reference that solid solution between distinct but structurally related systems is a strategy to explore the possible phosphors for phosphor-converted light-emitting diodes.
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Affiliation(s)
- Aijun Mao
- Department of Materials Science, School of Materials Science & Engineering, Lanzhou Jiaotong University, Lanzhou 730070, P.R. China
| | - Yali Guo
- Department of Materials Science, School of Materials Science & Engineering, Lanzhou Jiaotong University, Lanzhou 730070, P.R. China
| | - Weihui Zhou
- Department of Materials Science, School of Materials Science & Engineering, Lanzhou Jiaotong University, Lanzhou 730070, P.R. China
| | - Pai Lv
- Department of Materials Science, School of Materials Science & Engineering, Lanzhou Jiaotong University, Lanzhou 730070, P.R. China
| | - Xinwei Wang
- Department of Materials Science, School of Materials Science & Engineering, Lanzhou Jiaotong University, Lanzhou 730070, P.R. China
| | - Lin Lai
- Department of Materials Science, School of Materials Science & Engineering, Lanzhou Jiaotong University, Lanzhou 730070, P.R. China
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Luo Z, Zou H, Zheng Z, Zhao Y, Wang C, Sun Q, Song Y. Ca 9-yMg yNaGd 0.667(PO 4) 7:Eu 2+: A Single Eu 2+-Doped Full-Spectrum White Light Emission Phosphor with High Color Rendering Index. Inorg Chem 2024. [PMID: 39207770 DOI: 10.1021/acs.inorgchem.4c01750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/04/2024]
Abstract
The multi-cationic site occupation control of rare earth doped phosphor materials is one of the key factors in achieving single-phase full-spectrum emission. In this work, the site distribution of Eu2+ in Ca9NaGd0.667(PO4)7 (CNGP):x%Eu2+ phosphors with multi-cationic sites was determined. Under 385 nm excitation, CNGP:x%Eu2+ samples exhibited a cyan emission composed of three sub-Gaussian components. The CNGP:1.5%Eu2+ phosphor was structurally modified through the partial substitution of Mg2+ for Ca2+ according to the crystallographic site engineering theory, and corresponding luminescent properties had been adjusted. When the concentration of Mg2+ changed, the Ca9-yMgyNaGd0.667(PO4)7:1.5%Eu2+ (CNGPE:yMg2+) phosphors exhibited a tunable emission from cyan to orange and achieved white light emission at y = 0.6. Based on the change of the crystal field environment, the mechanism of Mg2+ substitution affecting the luminescence characteristics of CNGP:x%Eu2+ phosphors was researched in detail. The light-emitting diode device consisted of a CNGPE:0.6Mg2+ phosphor and a 385 nm chip and had a high color rendering index (CRI = 91.9), low correlated color temperature (CCT = 4852 K), and excellent color stability. The optical performance of this device makes it promising to be used in full spectrum lighting.
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Affiliation(s)
- Zhou Luo
- College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China
| | - Haifeng Zou
- College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China
| | - Zhibo Zheng
- College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China
| | - Yanxia Zhao
- College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China
| | - Chao Wang
- College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China
| | - Qinghai Sun
- College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China
| | - Yanhua Song
- College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China
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Zhao Y, Zheng Z, Li Z, Shi Z, Song Y, Zou B, Zou H. Ba 3Lu(BO 3) 3:Ce 3+,Tb 3+/Mn 2+: Dual-Functional Material for WLEDs and Optical Pressure Sensing. Inorg Chem 2024; 63:4288-4298. [PMID: 38369784 DOI: 10.1021/acs.inorgchem.3c04454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2024]
Abstract
Ba3Lu(BO3)3(BLB):Ce3+,Tb3+/Mn2+ phosphors were designed to explore effective and multifunctional applications. Under the excitation of near-ultraviolet (n-UV) light, the BLB:Ce3+ phosphor showed broad-band blue emission. After codoping with Mn2+ ions, the single-phase white light phosphor is achieved through the energy transfer (ET) between Ce3+ and Mn2+. In addition, thermal stability is significantly enhanced by the addition of Tb3+ (BLB:0.02Ce3+,0.20Tb3+) compared to that codoped with Mn2+ (BLB:0.02Ce3+,0.10Mn2+). The light-emitting diode (LED) device with warm white light emission is fabricated with UV-chip-coated BLB:0.02Ce3+,0.05Tb3+ and Sr2Si5N8:Eu2+ phosphors, showing a good potential application value for LEDs. Additionally, the spectral properties of borate-based phosphors (BLB:0.02Ce3+) under high pressure were studied for the first time. Surprisingly, the change of pressure enabled the emission peak of BLB:0.02Ce3+ to be tuned from 485 to 552 nm, and dλ/dP is 3.51 nm GPa-1. The color changes from blue to yellow with an increase of pressure. Compared with the reported data, the pressure-sensing sensitivity based on the central peak shift in this work is the highest in all Ce3+ single-doped samples. In addition, the emitting color and intensity were gradually regained after decompression. The intensity can reach 80% of the initial intensity. All data demonstrate that the BLB:0.02Ce3+ phosphor has the potential to be utilized as an optical pressure sensor due to the high-pressure sensitivity and visible color tuning.
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Affiliation(s)
- Yanxia Zhao
- Department of Chemical Engineering and Applied Chemistry, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, P.R. China
| | - Zhibo Zheng
- Department of Chemical Engineering and Applied Chemistry, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, P.R. China
| | - Zhongliang Li
- Department of Chemical Engineering and Applied Chemistry, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, P.R. China
| | - Zhan Shi
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P.R. China
| | - Yanhua Song
- Department of Chemical Engineering and Applied Chemistry, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, P.R. China
| | - Bo Zou
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Qianjin Street 2699, Changchun 130012, P.R. China
| | - Haifeng Zou
- Department of Chemical Engineering and Applied Chemistry, College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, P.R. China
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Zeng Q, Runowski M, Xue J, Luo L, Marciniak L, Lavín V, Du P. Pressure-Induced Remarkable Spectral Red-Shift in Mn 2+ -Activated NaY 9 (SiO 4 ) 6 O 2 Red-Emitting Phosphors for High-Sensitive Optical Manometry. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2308221. [PMID: 38103000 PMCID: PMC10916622 DOI: 10.1002/advs.202308221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 11/25/2023] [Indexed: 12/17/2023]
Abstract
To settle the low sensitivity of luminescent manometers, the Mn2+ -activated NaY9 (SiO4 )6 O2 red-emitting phosphors with splendid pressure sensing performances are developed. Excited by 408 nm, the resulting products emit bright red emission originating from 4 T1 (4 G) → 6 A1 transition of Mn2+ , in which the optimal concentration of the activator ion is ≈1 mol%. Moreover, the admirable thermal stability of the developed phosphors is studied and confirmed by the temperature-dependent emission spectra, based on which the activation energy is derived to be 0.275 eV. By analyzing the pressure-dependent Raman spectra, the structural stability of the synthesized compounds at extreme conditions is verified. Furthermore, the designed phosphors exhibit remarkable spectral red-shift at elevated pressure. Especially, as pressure increases from 0.75 to 7.16 GPa, the emission band centroid shifts from 617.2 to 663.4 nm, resulting in a high sensitivity (dλ/dP) of 7.00 nm GPa-1 , whereas the full width at half maximum (FWHM) increases from 83.0 to 110.6 nm, leading to the ultra-high sensitivity (dFWHM/dP) of 10.13 nm GPa-1 . These achievements manifest that the designed red-emitting phosphors are appropriate for ultrasensitive optical manometry. More importantly, the developed manometer is a current global leader in sensitivity, when operating in the band-width mode, that is, FWHM.
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Affiliation(s)
- Qifeng Zeng
- School of Physical Science and TechnologyNingbo UniversityNingboZhejiang315211China
| | - Marcin Runowski
- Faculty of ChemistryAdam Mickiewicz UniversityUniwersytetu Poznańskiego 8Poznań61–614Poland
| | - Junpeng Xue
- School of ScienceJiangsu University of Science and TechnologyZhenjiang212100China
| | - Laihui Luo
- School of Physical Science and TechnologyNingbo UniversityNingboZhejiang315211China
| | - Lukasz Marciniak
- Institute of Low Temperature and Structure ResearchPolish Academy of SciencesOkólna 2Wrocław50–422Poland
| | - Víctor Lavín
- Departamento de FísicaMALTA‐Consilider TeamUniversidad de La LagunaApartado de Correos 456San Cristóbal de La LagunaSanta Cruz de TenerifeE‐38200Spain
| | - Peng Du
- School of Physical Science and TechnologyNingbo UniversityNingboZhejiang315211China
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Dong L, Gao J, Guo Y, Hou J, Shao B, Fang Y. Development of a novel Eu 2+ activated oxonitridosilicate cyan phosphor for enhancing the color quality of a violet-chip-based white LED. Dalton Trans 2024; 53:4175-4184. [PMID: 38319141 DOI: 10.1039/d3dt04188c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Cyan phosphors are urgently needed to fill the cyan gap and improve the spectral continuity of white light-emitting diodes (LEDs) to cater to the high demand for high-quality lighting. Here, a series of new Eu2+-activated La3Si6.5Al1.5N9.5O5.5 (LSANO) cyan phosphors were prepared, and their luminescence properties and color centers were analyzed through fluorescence spectral measurements from 7 K to 475 K. At 300 K, the photoluminescence excitation (PLE) spectrum monitored at 483 nm presents a broadband of 200-460 nm with a peak at 398 nm, matching well with commercial violet LED chips. When excited by 398 nm violet light, the photoluminescence emission (PL) spectrum of LSANO:0.01Eu2+ exhibits a cyan emission band at about 483 nm. At 7 K, the emission spectrum clearly shows an asymmetric emission band and the emission peak wavelength changes from 483 nm (300 K) to 500 nm (7 K), indicating that there are two possible color centers in the LSANO:Eu2+ phosphor. Moreover, the maximum emission value can be adjusted from 480 to 499 nm by adjusting the doping content of Eu2+. Finally, a violet-chip-based white LED with the optimized color quality of Ra = 91.4, Rf = 90.1, and Rg = 93.6 was fabricated by adding the prepared cyan phosphor, verifying the potential application of the prepared cyan phosphor LSANO:Eu2+ in high-quality white LEDs.
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Affiliation(s)
- Langping Dong
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 201418, China.
| | - Jinqing Gao
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 201418, China.
| | - Yijia Guo
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 201418, China.
| | - Jingshan Hou
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 201418, China.
| | - Baiqi Shao
- Joint Centre of Translation Medicine, Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, Zhejiang 325000, P.R. China
| | - Yongzheng Fang
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 201418, China.
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Yasunaga T, Kobayashi M, Oqmhula K, Qi H, Ichibha T, Hongo K, Yamamoto S, Maezono R, Mitsuishi M, Osada M, Kato H, Kakihana M. Multiemission of Ce 3+ from a Single Crystallographic Site Induced by Disordering of Ions. Inorg Chem 2024; 63:1288-1295. [PMID: 38175191 DOI: 10.1021/acs.inorgchem.3c03789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
White-light emission with a single activator is an attractive function of phosphors. In this work, we investigated the photoluminescence properties of Ca5.7Y1.3Si7O16.7N3.3, which is a compound denoted as Ca4+xY3-xSi7O15+xN5-x discovered by our group, with Ce-activation using optical measurements and density functional theory (DFT) calculation. Samples showed a tunable emission from purple to white under ultraviolet (UV) light. In this compound, Ca and Y as well as anions are distributed disorderly, and Ca/Y ions occupy two crystallographically distinct sites; those sites are possible sites for Ce substitution. DFT calculation and structural refinement revealed that the tunable emission was generated by Ce at the crystallographically equivalent site but with distinct local structures caused by the disordering of cations and anions. As far as we know, this is the first report about a white-light-emitting phosphor with only Ce activation.
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Affiliation(s)
- Takuya Yasunaga
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
| | - Makoto Kobayashi
- Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Kenji Oqmhula
- School of Information Science, JAIST (Japan Advanced Institute of Science and Technology), Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan
| | - Huan Qi
- School of Information Science, JAIST (Japan Advanced Institute of Science and Technology), Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan
| | - Tom Ichibha
- School of Information Science, JAIST (Japan Advanced Institute of Science and Technology), Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan
| | - Kenta Hongo
- Research Center for Advanced Computing Infrastructure, JAIST (Japan Advanced Institute of Science and Technology), Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan
| | - Shunsuke Yamamoto
- Graduate School of Engineering, Tohoku University, 6-6-11, Aramaki Aza Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Ryo Maezono
- School of Information Science, JAIST (Japan Advanced Institute of Science and Technology), Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan
| | - Masaya Mitsuishi
- Graduate School of Engineering, Tohoku University, 6-6-11, Aramaki Aza Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Minoru Osada
- Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
- Research Center for Crystalline Materials Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Hideki Kato
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
| | - Masato Kakihana
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
- Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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