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A sol–gel process for the preparation of thick YAG:Ce3+ films has been developed. YAG:Ce3+ 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 lm 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:Ce3+ PL efficiency, a minimum 1.2 lm 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 C 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:Ce3+ phosphors with relatively high Ce concentration. The present technology is intended for YAG:Ce3+ 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. |
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真强必胜: 金币+1, 谢谢 2014-01-08 21:31:35
miaobobo510: 金币+5, 翻译EPI+1 2014-01-12 00:14:41
真强必胜: 金币+1, 谢谢 2014-01-08 21:31:35
miaobobo510: 金币+5, 翻译EPI+1 2014-01-12 00:14:41
| 一种制备厚YAG:Ce3+膜的溶胶-凝胶工艺被开发出来。 典型的钇铝柘榴石荧光外形的YAG:Ce3+磷光膜被成功制备。目前介绍的工作制备了最大厚度2lm的单相钇铝柘榴石。所制备的钇铝柘榴石膜的折光率(1.85 @ 633 nm and 1.80 @ 1540 nm)非常接近于钇铝柘榴石单晶体。我们制备的膜的发光效率被证实与样品中钇铝柘榴石的相形成和取决于膜厚度的钇铝柘榴石的相演化率相密切相关。为了达到高YAG:Ce3+发光效率，最小厚度1.2lm是必要的。同时发现了钇铝柘榴石膜的光学质量随着沉积和热处理过程而降低，可能是因为内部钇铝柘榴石晶体的生长。作为一种在高发光效率和良好光学质量之间的折衷，在1000°C下煅烧了30分钟的30层平面波导样品中完成了镜耦合。证明了这个样品能够支持在可见光波长下的多波导模型而且它在1540nm下的增殖损失被估计为4.2 dB/cm。在这项工作中，膜的温度淬火效应也被测试，与相对高Ce浓度的商业YAG:Ce3+膜相同。目前的技术旨在可能用于白LED上YAG:Ce3+磷光膜，而且可能也有益于可能对钇铝柘榴石膜感兴趣的任何领域。 |
2楼2014-01-08 16:02:08
qiaoxiaojing
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3楼2014-01-08 21:46:18