1
|
Srivastava AM, Brik MG, Ma CG, Beers WW, Cohen WE, Piasecki M. Effect of Covalence and Degree of Cation Order on the Luminous Efficacy of Mn 4+ Luminescence in the Double Perovskites, Ba 2BTaO 6 ( B = Y, Lu, Sc). J Phys Chem Lett 2024; 15:4175-4184. [PMID: 38597687 PMCID: PMC11033934 DOI: 10.1021/acs.jpclett.4c00205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 04/03/2024] [Accepted: 04/05/2024] [Indexed: 04/11/2024]
Abstract
The spectroscopic properties of the Mn4+ ion are investigated in the series of isostructural double perovskite compounds, Ba2BTaO6 (B = Y, Lu, Sc). A comparison of these properties highlights the influence of covalent bonding within the perovskite framework and the degree of order between the B3+-Ta cations on the energy and intensity of the Mn4+2E → 4A2 emission transition (R-line). These two parameters of the emission spectrum are of importance for practical application since they determine the phosphor luminous efficacy. The influence of covalent bonding within the corner shared BO6/2 and TaO6/2 perovskite framework on the energy of the R-line energy is investigated. From the spectroscopic data, we have derived information on the influence of the degree of order between the B3+ and Ta5+ cations on the intensity of the R-line. The lowest energy and the highest intensity of the R-line are found in the double perovskite, Ba2ScTaO6. The purpose of this work is to propose for first time an explanation of these effects in the considered double perovskites. The obtained results are useful guidelines for practical improvement and tuning of key parameters of phosphors to the desired values.
Collapse
Affiliation(s)
- Alok M. Srivastava
- Current
Chemicals, 1099 Ivanhoe
Road, Cleveland, Ohio 44110, United States
| | - Mikhail G. Brik
- School
of Optoelectronic Engineering & CQUPT-BUL Innovation Institute, Chongqing University of Posts and Telecommunications, Chongqing 400065, PR China
- Center
of Excellence for Photoconversion, Vinča Institute of Nuclear
Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade 11351, Serbia
- Institute
of Physics, University of Tartu, W. Ostwald Str. 1, Tartu 50411, Estonia
- Academy
of Romanian Scientists, Ilfov Str. No. 3, Bucharest 050663, Romania
| | - Chong-Geng Ma
- School
of Optoelectronic Engineering & CQUPT-BUL Innovation Institute, Chongqing University of Posts and Telecommunications, Chongqing 400065, PR China
| | - William W. Beers
- Current
Chemicals, 1099 Ivanhoe
Road, Cleveland, Ohio 44110, United States
| | - William E. Cohen
- Current
Chemicals, 1099 Ivanhoe
Road, Cleveland, Ohio 44110, United States
| | - Michal Piasecki
- Faculty of
Science and Technology, Jan Długosz
University, Armii Krajowej
13/15, Czestochowa 42200, Poland
| |
Collapse
|
2
|
Wang L, Zhang Y, Gao D, Sha X, Chen X, Zhang Y, Zhang J, Zhang X, Cao Y, Wang Y, Li X, Xu S, Yu H, Chen B. Luminescence properties and Judd-Ofelt analysis of Tb 3+ doped Sr 2YTaO 6 double perovskite phosphors for white LED applications. Dalton Trans 2024; 53:6399-6409. [PMID: 38498319 DOI: 10.1039/d4dt00302k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
A series of Tb3+-doped Sr2YTaO6 double perovskite phosphors (SYT:Tb3+) were synthesized using a conventional solid-state reaction method. A strong green emission was observed in the SYT:Tb3+ phosphors, and the optimal doping concentration of Tb3+ was confirmed to be 5 mol%. The electric dipole-dipole interaction was ascribed to be the main mechanism for the luminescence concentration quenching. Analysis of the concentration-dependent fluorescence decay confirmed that the self-generated quenching model holds for the dynamic process of Tb3+ decays in SYT. Furthermore, the internal quantum efficiencies, non-radiative transition rates, and energy transfer rates of the 5D4 level for the SYT:Tb3+ samples were estimated, respectively. The luminescence thermal stability of the sample was also evaluated based on the Arrhenius model. The chromaticity shift of the SYT:5 mol% Tb3+ phosphor was examined to be 0.013 when the sample temperature was increased from 303 to 483 K, thus indicating excellent chromaticity shifting resistance under high temperature conditions. Moreover, the Judd-Ofelt parameters were calculated from the emission spectra of SYT:Tb3+ to be Ω2 = 0.29 × 10-20, Ω4 = 0.45 × 10-20, and Ω6 = 0.72 × 10-20 cm2, respectively. The fluorescence branching ratios and radiative transition rates for the 5D4 level were calculated based on the obtained Judd-Ofelt parameters. Finally, a white light-emitting diode (LED) prototype was assembled using a 310 nm LED chip combined with a prepared green SYT:Tb3+ phosphor and two other commercial blue and red phosphors. The obtained warm white light exhibits good chromaticity coordinates (0.32, 0.32) and a high color rendering index of 96.1. Based on the above results, it can be known that the prepared SYT:Tb3+ phosphors have a potential application as green emitting phosphors in white LEDs.
Collapse
Affiliation(s)
- Li Wang
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
- College of Medical Laboratory, Dalian Medical University, Dalian, 116044, Liaoning, PR China
| | - Yuhang Zhang
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| | - Duan Gao
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| | - Xuezhu Sha
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| | - Xin Chen
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| | - Yanqiu Zhang
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| | - Jinsu Zhang
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| | - Xizhen Zhang
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| | - Yongze Cao
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| | - Yichao Wang
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| | - Xiangping Li
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| | - Sai Xu
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| | - Hongquan Yu
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| | - Baojiu Chen
- School of Science, Dalian Maritime University, Dalian, 116026, Liaoning, PR China.
| |
Collapse
|
3
|
Li F, Ye Y, Cui R, Zhang J, Xu C, Xu H, Zhang G, Deng C. Phosphors Ba 2 LaTaO 6 :Mn 4+ and its alkali metal charge compensation for plant growth illumination. LUMINESCENCE 2023; 38:1562-1571. [PMID: 37309260 DOI: 10.1002/bio.4537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 06/06/2023] [Accepted: 06/06/2023] [Indexed: 06/14/2023]
Abstract
A series of Mn4+ -doped and Mn4+ ,K+ -co-doped Ba2 LaTaO6 (BLT) double-perovskite phosphors was synthesized using a high-temperature solid-state reaction. The phase purity and luminescence properties were also studied. The optimum doping concentration of Mn4+ and K+ was obtained by investigating the photoluminescence excitation spectra and photoluminescence emission spectra. The comparison of BLT:Mn4+ phosphors with and without K+ ions shows that the photoluminescence intensity of K+ -doped phosphors was greatly enhanced. This is because there was a charge difference when Mn4+ ions were doped with Ta5+ ions in BLT. Mn4+ -K+ ion pairs were formed after doping K+ ions, which hinders the nonradiative energy transfer between Mn4+ ions. Therefore, the luminescence intensity, quantum yield, and thermal stability of phosphors were enhanced. The electroluminescence spectra of BLT:Mn4+ and BLT:Mn4+ ,K+ were measured. The spectra showed that the light emitted from the phosphors corresponded well with chlorophyll a and phytochrome PR . The results show that the BLT:Mn4+ ,K+ phosphors had good luminescence properties and application prospects and are ideal materials for plant-illuminated red phosphors.
Collapse
Affiliation(s)
- Fadong Li
- Key Laboratory of Functional Composite Materials of Guizhou Province, College of Big Data and Information Engineering, Guizhou University, Guiyang, China
- School of Electronics and Information Engineering, Guiyang University, Guiyang, China
| | - Yaosen Ye
- Key Laboratory of Functional Composite Materials of Guizhou Province, College of Big Data and Information Engineering, Guizhou University, Guiyang, China
| | - Ruirui Cui
- Key Laboratory of Functional Composite Materials of Guizhou Province, College of Big Data and Information Engineering, Guizhou University, Guiyang, China
| | - Jun Zhang
- College of Computer and Information Engineering, Guizhou University of Commerce, Guiyang, China
| | - Cong Xu
- Key Laboratory of Functional Composite Materials of Guizhou Province, College of Big Data and Information Engineering, Guizhou University, Guiyang, China
| | - Hui Xu
- Key Laboratory of Functional Composite Materials of Guizhou Province, College of Big Data and Information Engineering, Guizhou University, Guiyang, China
| | - Gangyi Zhang
- Key Laboratory of Functional Composite Materials of Guizhou Province, College of Big Data and Information Engineering, Guizhou University, Guiyang, China
| | - Chaoyong Deng
- Key Laboratory of Functional Composite Materials of Guizhou Province, College of Big Data and Information Engineering, Guizhou University, Guiyang, China
- School of Electronics and Information Engineering, Guiyang University, Guiyang, China
| |
Collapse
|