Semiconductor-polymer composite with strong nonlinear optical properties

被引：0
|
作者：
Franc, Jan [1 ]
Babentsov, Volodymyr [2 ]
Feychuk, Petr [3 ]
Kunc, Jan [1 ]
Hlidek, P. [1 ]
机构：
[1] Charles Univ Prague, Inst Phys, Ke Karlovu 5, CZ-12116 Prague 2, Czech Republic
[2] Inst Semicond Phys, UA-03028 Kiev, Ukraine
[3] Chernivtsi Natl Univ, UA-58012 Chernovtsy, Ukraine
来源：
NONLINEAR OPTICS AND APPLICATIONS II | 2007年 / 6582卷
关键词：
nonlinear; nanocrystals; CdTe;
D O I：
10.1117/12.722491
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Photoluminescence (PL) characteristics of CdTe nanocrystals (NCs) adsorbed into polymer films are presented compared to the PL of bulk CdTe. Using the dependence of PL on excitation power we determined the carrier lifetime at 80K which indicates that carrier trapping in surface and polymer states was the main decay mechanism of excitation. The occurrence of at least two deep defect induced luminescence bands in CdTe NCs was demonstrated for the first time. Our investigation also revealed changes in PL properties induced by the visible light irradiation or by the preparation conditions. These results were explained by an increase of nonradiative recombination in the surface states of NCs and in the polymer.
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页数：8
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