Luminescence properties for Eu3+ doped Na2La2Ti3O10 red phosphors

被引：0
作者：
Department of Physics, Dalian Maritime University, Dalian, China [1 ]
机构：
[1] Department of Physics, Dalian Maritime University, Dalian
来源：
Guangdianzi Jiguang | / 10卷 / 1916-1923期
关键词：
Concentration quenching; Energy transfer; Red phosphor; Thermal quenching;
D O I：
10.16136/j.joel.2015.10.0486
中图分类号：
学科分类号：
摘要：
Na2La2Ti3O10 red phosphors with various Eu3+ concentrations were successfully prepared via a traditional high temperature solid state reaction method. The influence of Eu3+ concentration on the luminescence properties and the crystal structure of Na2(La1-xEux)2Ti3O10 phosphors are investigated. XRD results indicate that the samples doped with 0-40% Eu3+ exhibit tetragonal phase Na2La2Ti3O10, while when Eu3+ concentration reaches 60%, another orthorhombic phase NaEuTiO4 appears. The excitation and emission spectra for the samples are investigated. It is found that the products could be effectively excited by a broad band in ultraviolet region, which indicates an efficient energy transfer from Na2La2Ti3O10 host to Eu3+ ions. Meanwhile, bright orange-red light emissions are detected with ultraviolet light excitation. Based on the Van model, exchange interaction of Eu3+ ions is confirmed to be the main reason for the concentration quenching. The reason why self-generated quenching process of Eu3+ occurs is explained based on Auzel's model. Besides, the temperature dependent emission spectra and fluorescence decay curves are measured. And the results reveal that thermal quenching behavior could be ascribed to the crossover process, and the activation energy is calculated to be 0.26 eV by the Arrhenius model. The results show that the luminescence of Eu3+ doped Na2La2Ti3O10 red phosphors has a good thermal stability. ©, 2015, Board of Optronics Lasers. All right reserved.
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页码：1916 / 1923
页数：7
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