ChemistrySelect
·
2025
·Vol. 10
·期 17
·e202500785
·
IF 2
Jing Wang,Xingke Zheng,Jiaqi Gao,Yue Luo,Zhe Jiang
Graphical This study reports the synthesis of Ca 2 La(Ta,Mn)O 6 double perovskite red emitters, exhibiting strong red emission at 691 nm, with excellent thermal stability and UV excitation. A wireless power transfer system demonstrates adjustable luminescence under various voltages and frequencies, positioning this material as a promising candidate for indoor lighting and noncontact circuits. The rapid adoption of light emitting diodes technology stems from its high efficiency, long lifespan, and energy-saving capabilities. However, achieving high-quality white light emitting diodes, particularly through the integration of efficient red emitters, remains a significant challenge. This study reports the synthesis of Ca₂La(Ta,Mn)O₆ double perovskite red emitters via high-temperature solid-state reactions. The material exhibits a strong red emission peak at 691 nm, attributed to Mn⁴⁺ ions at symmetrical [TaO₆]⁷⁻ octahedral sites, confirmed by g = 2.008 in electron paramagnetic resonance spectroscopy. The UV excitation spectrum (250–600 nm) and thermal stability were analyzed, showing a retained optical intensity of 41% at 423 K. Additionally, a red emitter was developed, and a noncontact LCC-S wireless power transfer driving system was constructed. The system demonstrated adjustable luminescence under varying input voltages (4–7.3 V) and frequencies (90–110 kHz), highlighting its potential for dynamic lighting applications. These findings suggest Ca 2 La(Ta,Mn)O 6 double perovskite as a promising candidate for indoor lighting and noncontact circuit systems.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Photonics Research
·
2023
·Vol. 4
·期 6
·2300106
·
IF 3.7
Yuqi Chen,Guixian Li,Yang Ding,Qinan Mao,Meijiao Liu,Chunhua Wang,Runtian Zheng,Bao-Lian Su,Jiasong Zhong
Luminescence thermometry plays significant roles in various fields including industrial production, environmental detection, aerospace, and medicine. However, its accuracy improvement remains highly challenging due to the thermal quenching effect of phosphors. Herein, for the first time, a thermal-activated electron compensation Mn 2+ - and Tb 3+ -codoped Ca 2 LaTaO 6 phosphor is developed for multiparametric temperature sensing with tunable emission of Mn 2+ and antithermal quenching emission of Tb 3+ , leading to excellent accuracy at high temperatures. By virtue of the deep electron trap states induced by Mn 2+ dopant, the electrons in the deep trap can be thermally activated at high temperatures, which can replenish the attenuated Tb 3+ emission caused by thermal quenching, thus bringing out the antithermal quenching phenomenon. On account of the prominent emission properties, the luminescence intensity ratio (LIR) readout and lifetime-based thermometry are designed, providing a maximum relative sensitivity S R of 3.603% and 1.941% K −1 , respectively. Multiparametric temperature sensing and novel data analysis are also employed to further improve the accuracy of the luminescence thermometer. The outstanding relative thermal sensitivity ranging from 8.72% to 16.11% K −1 and temperature uncertainty order of 10 −3 are achieved. These results demonstrate that the designed Ca 2 LaTaO 6 :Mn 2+ /Tb 3+ phosphor material is a promising thermal-sensing candidate.
研究领域:
材料科学
·
光学传感器
·
发光材料
·
测温技术
·
固态物理
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Zongjie Zhang,Liangling Sun,Balaji Devakumar,G. Annadurai,Jia Liang,Shaoying Wang,Qi Sun,Xiaoyong Huang
In this paper, a series of Eu 3+ -activated double-perovskite Ca 2 LaTaO 6 (abbreviated as CLT: x Eu 3+ ; x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8) red-emitting phosphors have been successfully synthesized via the conventional high-temperature solid-state reaction method. These samples were characterized by X-ray diffraction, Rietveld refinement , field-emission scanning electron microscope , elemental mapping, energy-dispersive spectrum, room-temperature photoluminescence , decay lifetimes, quantum efficiency, CIE color coordinates, and temperature-dependent emission spectra . Interestingly, under blue excitation into the 7 F 0 → 5 D 2 transition of Eu 3+ at 466 nm, the CLT: x Eu 3+ phosphors could emit bright red light corresponding to the 5 D 0 → 7 F J (J = 1, 2, 3, 4) transitions. Their luminescence properties have been investigated as a function of the Eu 3+ ions concentration . It was found that the CLT:0.4Eu 3+ sample exhibited the strongest emission intensity, and the concentration quenching effect was caused by the dipole-dipole interaction among Eu 3+ activators. Impressively, the emission intensity of the as-prepared CLT:0.4Eu 3+ phosphors was about 4.3 times higher than the commercial Y 2 O 3 :Eu 3+ red phosphors. Moreover, the CLT:0.4Eu 3+ sample had excellent CIE color coordinates of (0.665, 0.334) and supereminent color purity of 95.3%. Notably, the study on temperature-dependent emission spectra of the CLT:0.4Eu 3+ sample revealed its good thermal stability and color stability at high temperatures. These excellent photoluminescence properties of CLT:0.4Eu 3+ phosphors indicated their promising application potential in white light-emitting diodes as blue-light-excitable red phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·
IF 3.5
Hang Liu,Haozhou Tian,Chunhui Sun,Qiang Wang,Hongqun Zhu,Xuezhong Yang,Haoran Wang,Yuhong Zhang
A series of Nd3+/Yb3+ co-doped Ca2LaTaO6 (CLTO) phosphors are synthesized by a high temperature solid phase method. Structural characterization confirms the successful incorporation of Nd3+ and Yb3+ ions into the CLTO host lattice. The photoluminescence excitation (PLE) spectra and photoluminescence (PL) spectra of CLTO:Nd3+ and CLTO:Nd3+/Yb3+ are investigated in detail. Under the excitation of ultraviolet (UV) and visible (VIS) light, the CLTO:Nd3+/Yb3+ phosphor emits broadband near infrared (NIR) luminescence. In particular, the luminescence intensity of the Yb3+ ion is increased through an energy transfer (ET) process from Nd3+ to Yb3+. The luminescence mechanism of the CLTO:Nd3+/Yb3+ sample is analyzed based on the decay lifetime and PL spectra. In addition, the NIR emission intensity of Yb3+ ions is also enhanced by doping K+ ions. The broadband luminescence (850–1050 nm) of the CLTO:Nd3+/Yb3+/K+ phosphor has good application in solar cells and anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）