SIZE EFFECTS ON LUMINESCENCE DYNAMICS OF CDS MICROCRYSTALLITES EMBEDDED IN POLYMER-FILMS

被引：78

作者：

MISAWA, K ^{[1
]}

YAO, H ^{[1
]}

HAYASHI, T ^{[1
]}

KOBAYASHI, T ^{[1
]}

机构：

[1] MITSUI TOATSU CHEM CO LTD,CENT RES INST,SAKAE KU,YOKOHAMA 247,JAPAN

来源：

CHEMICAL PHYSICS LETTERS | 1991年 / 183卷 / 1-2期

关键词：

D O I：

10.1016/0009-2614(91)85109-A

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：113 / 118

页数：6

共 18 条

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