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首页> 外文期刊>CERAMICS INTERNATIONAL >Preparation Eu-doped ca-alpha-SiAlON phosphor by heterogeneous precipitation: An orange-yellow phosphor for white light-emitting diodes
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Preparation Eu-doped ca-alpha-SiAlON phosphor by heterogeneous precipitation: An orange-yellow phosphor for white light-emitting diodes

机译：通过异相沉淀制备Eu掺杂的ca-alpha-SiAlON荧光粉：用于白色发光二极管的橙黄色荧光粉

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摘要

In this research, Ca-alpha-SiAlON phosphors with compositions of Ca1-xEuxSi9Al3ON15 (x=2.5%, 5.0%, 7.5%, 10.0% and 15.0%) were synthesized by heterogeneous precipitation processing. The solid state reaction and nitridation reaction were completed at 1400-1500 degrees C for 12 h in a flow of N-2-H-2 (H-2, 5 vol%). The phase of alpha-SiAlON was prepared at 1450 degrees C for 12 h. The phosphors showed strong and broad absorption in the range of 230-530 nm and a broad orange-yellow emission band ranging from 500 to 700 nm for peaking at 582-600 nm which were corresponding to the phosphor prepared by the conventional solid state reaction. The results indicate a concentration quenching effect at x >= 7.5% and a systematic red-shift in emission wavelength as the heat-treatment temperature or the Eu2+ concentration increases. The quantum efficiency of the sample heat-treated at 1600 degrees C for 12 h, reached 70.56% (internal) and 45.7% (external) with the 450 nm excitation. The corresponding CCT (Correlated color temperature) range of white LED lamps consisting of a blue LED chip and the Ca-alpha-SiAlON phosphor can be ranging from 2000 to 2700 K. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
机译：在这项研究中，通过异质沉淀工艺合成了具有Ca1-xEuxSi9Al3ON15组成的Ca-alpha-SiAlON荧光粉（x = 2.5％，5.0％，7.5％，10.0％和15.0％）。在N-2-H-2（H-2，5体积％）的流动下，在1400-1500摄氏度下完成了12h的固态反应和氮化反应。 α-SiAlON相在1450摄氏度下制备12小时。该磷光体在230-530nm的范围内显示出强而宽的吸收，并且在582-600nm处达到峰值时在500-700nm的宽橙黄色发射带，这是通过常规固态反应制备的磷光体。结果表明，随着热处理温度或Eu2 +浓度的增加，x> = 7.5％时的浓度猝灭效应和发射波长的系统红移。在450纳米激发下，在1600摄氏度下热处理12小时的样品的量子效率达到70.56％（内部）和45.7％（外部）。由蓝色LED芯片和Ca-alpha-SiAlON荧光粉组成的白色LED灯的相应CCT（相关色温）范围可以在2000到2700 K之间。（C）2015 Elsevier Ltd和Techna Group S.r.l.版权所有。

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