摘要
用发射、激发、时间分辨光谱和荧光衰减曲线测量，研究了玻璃基质中ＺｎＳＭｎ２＋纳米晶的荧光瞬态行为．发现材料中的３８９ｎｍ和４０４ｎｍ的蓝色发射不是通常报导的Ｄ－Ａ对自激活发光，而是Ｍｎ２＋的间隙态引起的变化的自激活发光．这与我们前面的光谱和ＥＰＲ谱实验结果是一致的．这种发射与Ｍｎ２＋间无能量传递．与ＺｎＳＭｎ２＋体粉末相比Ｍｎ２＋的４Ｔ１→６Ａ１的跃迁荧光寿命明显变短．这说明由于量子限域效应，在纳米晶中ＺｎＳ向Ｍｎ２＋能量传递速度加快。
The transient behavious of ZnS∶Mn 2+ nanocrystallites dispersed in Pyrex glasses were studied by emission, excitation, time resolved spectra and luminescence decays. It was found that blue emissions peaked at 389 and 404nm are not self activated luminescence due to D A pairs but the emission from Mn 2+ located at the intersticial sites. This is in good agreement with the results of the previous EPR experiments. There are no energy transfers between this emission and Mn 2+ ions. The lifetimes of 4T 1→ 6A 1 transition to Mn 2+ ions were shortened compared with that of ZnS∶Mn 2+ bulk powder. It is suggested that the ratio of the energy transfer from ZnS to Mn 2+ ions gets faster by quantum confinements and efficient radiationless channels provided by surface states.
出处
《发光学报》
EI
CAS
CSCD
北大核心
1999年第2期106-108,共3页
Chinese Journal of Luminescence
基金
国家自然科学基金
中国科学院激发态物理开放实验室基金
关键词
纳米复合体
荧光寿命
玻璃基质
硫化锌
掺锰
nanocoposites, luminescence lifetime, time correlated single photon counting technology
