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Transparency and microstructure of YAG:Ce phosphor particles

机译：YAG：Ce荧光粉颗粒的透明度和微观结构

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Influence of microstructure of YAG:Ce powder particles on their optical properties is studied to estimate light extraction efficiency from them. YAG:Ce powders are obtained using co-precipitation method and subsequent heat treatment. Single-phase garnet powder is obtained after heating to 1000 degrees C and higher. Microstructure changes significantly with increase of heat treatment temperature: after heat treatment at 900 degrees C powder comprises pieces of xerogel consisting of 20 nm particles and transparent in transmitted light under the optical microscope; after a heat treatment at 1300 degrees C well defined grains and pores are formed in powder particles, which is accompanied by a significant decrease of optical transparency. Photoluminescence intensity increases most significantly up to heat treatment temperature of 1300 degrees C, further increase of temperature leads to increase of photoluminescence intensity by less than 10%. It is supposed that development of pores in the particles obtained after thermal treatment above 1300 degrees C diminishes light extraction. (C) 2017 Elsevier B.V. All rights reserved.
机译：研究了YAG：Ce粉末颗粒的微观结构对其光学性能的影响，以估计它们的光提取效率。 YAG：Ce粉末是使用共沉淀法和随后的热处理获得的。加热到1000摄氏度或更高温度后，可获得单相石榴石粉末。显微组织随热处理温度的升高而发生显着变化：在900摄氏度下进行热处理后，粉末由20纳米颗粒组成的干凝胶片在光学显微镜下透射光透明；在1300℃下进行热处理之后，在粉末颗粒中形成了明确定义的晶粒和孔，这伴随着光学透明度的显着降低。直到1300℃的热处理温度，光致发光强度最显着地增加，温度的进一步升高导致光致发光强度的增加小于10％。据推测，在高于1300℃的热处理之后获得的颗粒中的孔的发展减少了光提取。 （C）2017 Elsevier B.V.保留所有权利。

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