SIZE EFFECTS ON LUMINESCENCE DYNAMICS OF CDS MICROCRYSTALLITES EMBEDDED IN POLYMER-FILMS
SIZE EFFECTS ON LUMINESCENCE DYNAMICS OF CDS MICROCRYSTALLITES EMBEDDED IN POLYMER-FILMS
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DOI：
10.1016/0009-2614(91)85109-a
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发表时间：
1991-08-23
影响因子：
2.8
通讯作者：
KOBAYASHI, T
中科院分区：
文献类型：
--
作者：
MISAWA, K;YAO, H;KOBAYASHI, T
我们研究了CdS微晶带边发射的皮秒动力学的尺寸依赖性。 从直径大于50埃的CdS微晶中观察到激子超辐射，而小于35埃的微晶仅从表面捕获态产生浅陷阱发射。 超辐射衰减率随粒子直径增加，在阈值温度以下几乎是恒定的，在该温度以上则减小。 的微晶的半径为25和29埃的阈值温度分别为45和30 K，与计算的径向压缩模式频率43.2和37.2 K，使用弹性球模型的良好协议。
We investigated the size dependence of picosecond dynamics of the band-edge emission from CdS microcrystallites. Excitonic superradiance was observed from CdS microcrystallites with larger diameters than 50 angstrom, while microcrystallites smaller than 35 angstrom yield only shallow-trap emission from surface-trapping states. The superradiant decay rate increases with particle diameter, is nearly constant below a threshold temperature, and decreases above that temperature. The threshold temperatures of microcrystallites of 25 and 29 angstrom in radius are 45 and 30 K, respectively, in good agreement with the calculated radial-compression-mode frequencies of 43.2 and 37.2 K, using the elastic-sphere model.