24小时热门版块排行榜

返回列表

miaobobo510

新虫 (初入文坛)

应助: 0 (幼儿园)
金币: 596.5
帖子: 38
在线: 7.8小时
虫号: 2780079
注册: 2013-11-05
专业: 资源化工

[求助] 麻烦给位虫友翻译下摘要

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.

回复此楼