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首页> 外文期刊>Optical Materials >Preparation and optical properties of sol-gel derived thick YAG:Ce~(3+) phosphor film
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Preparation and optical properties of sol-gel derived thick YAG:Ce~(3+) phosphor film

机译：溶胶-凝胶法制备厚YAG：Ce〜（3+）荧光粉的光学性能

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摘要

A sol-gel process for the preparation of thick YAG:Ce~(3+) films has been developed. YAG:Ce~(3+) phosphor films with a typical yttrium aluminum garnet (YAG) photoluminescence (PL) profile were prepared successfully. Single phase YAG films with a maximum thickness of 2 μm were prepared in the present work. The refractive index of the YAG films prepared (～1.85 @ 633 nm and ～1.80 @ 1540 nm) was very close to that of YAG single crystal. It was confirmed that the PL efficiency of the prepared films was strongly related to the degree of YAG phase formation in the samples and the rate of YAG phase evolution strongly depended on the film thickness. To achieve high YAG:Ce~(3+) PL efficiency, a minimum 1.2 nm of thickness is necessary. It was also found that the optical quality of the YAG films decreased following the deposition and thermal annealing processes, probably as a result of the growth of YAG crystals inside. As an example of a compromise between high PL efficiency and good optical quality, prism coupling was achieved on a 30-layer planar waveguide sample annealed at 1000 ℃ for 30 min. It was proved that this sample could support multiple waveguide modes at visible wavelengths and its propagation loss at 1540 nm was estimated at 4.2 dB/cm. The temperature quenching effect in the films of the present work was also measured, being the same as that of commercial YAG:Ce~(3+) phosphors with relatively high Ce concentration. The present technology is intended for YAG:Ce~(3+) phosphor films that may be applied on white LED and it may also be of benefit to any areas where YAG films may be of interest.
机译：开发了一种溶胶凝胶法制备厚的YAG：Ce〜（3+）薄膜。成功制备了具有典型钇铝石榴石（YAG）光致发光（PL）轮廓的YAG：Ce〜（3+）荧光粉薄膜。在本工作中，制备了最大厚度为2μm的单相YAG膜。制备的YAG薄膜的折射率（在633 nm处为〜1.85 @在1540 nm处为〜1.80）与YAG单晶的折射率非常接近。可以确认，所制备的膜的PL效率与样品中YAG相的形成程度密切相关，并且YAG相的演化速率强烈取决于膜厚度。为了获得高的YAG：Ce〜（3+）PL效率，最小厚度为1.2 nm是必需的。还发现，在沉积和热退火过程之后，YAG膜的光学质量下降，这可能是内部YAG晶体生长的结果。以高PL效率和良好光学质量之间的折衷为例，在30层平面波导样品中于1000℃退火30分钟，实现了棱镜耦合。证明该样品可以在可​​见波长下支持多种波导模式，其在1540 nm处的传播损耗估计为4.2 dB / cm。还测量了本工作膜中的温度猝灭效果，其与具有相对高的Ce浓度的商业YAG：Ce〜（3+）磷光体相同。本技术旨在用于可应用于白光LED上的YAG：Ce〜（3+）荧光粉膜，并且它也可能有益于可能关注YAG膜的任何领域。

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