Thermal quenching and luminescence lifetime of saturated green Sr1-xEuxGa2S4 phosphors
Thermal quenching and luminescence lifetime of saturated green Sr1-xEuxGa2S4 phosphors
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DOI：
10.1016/j.optmat.2012.05.025
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发表时间：
2012-09-01
影响因子：
3.9
通讯作者：
Smet, Philippe F.
中科院分区：
文献类型：
--
作者：
Joos, Jonas J.;Meert, Katrien W.;Smet, Philippe F.
由于缺乏有效的发射绿色的固态光源，发射饱和绿色发射的转换磷光体对于显示器和信号应用都是非常令人感兴趣的。在这项工作中，我们研究了Sr 1-xEuxGa 2S 4荧光粉的发光性能在很宽的掺杂浓度范围内（x = 0.01-0.3），作为温度的函数。磷光体在整个研究范围内显示出饱和的绿色发射，典型的峰值波长约为536 nm，半高宽为50 nm。当x = 0.04时，内量子效率为71%。对于该浓度，在400 K下的发射强度仍然是室温下强度的90%。通过测量作为铕浓度的函数的衰减和热猝灭曲线，我们能够解释晶格中铕离子的局部环境的基础上的发射特性。(C)2012 Elsevier B. V.保留所有权利。
Due to the lack of efficient green emitting solid state light sources, conversion phosphors emitting saturated green emission are highly interesting, both for display and signalling applications. In this work, we study the luminescence properties of Sr1-xEuxGa2S4 phosphors over a wide dopant concentration range (x = 0.01-0.3), as function of temperature. The phosphors show a saturated green emission over the entire studied range, with a typical peak wavelength around 536 nm and a FWHM of 50 nm. The internal quantum efficiency is 71% for x = 0.04. For this concentration, the emission intensity at 400 K is still 90% of the intensity at room temperature. By measuring both decay and thermal quenching profiles as a function of europium concentration, we were able to explain the emission properties on the basis of the local environment of the europium ions in the lattice. (C) 2012 Elsevier B.V. All rights reserved.