Nonlinear Photoluminescence Behavior in Closely Packed CdSe Nanocrystal Thin Films

Nonlinear Photoluminescence Behavior in Closely Packed CdSe Nanocrystal Thin Films
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密堆积 CdSe 纳米晶体薄膜中的非线性光致发光行为

DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Y. Yamaguchi
Y. Yamaguchi
中科院分区：
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文献类型：
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作者：
S. Maenosono;E. Ozaki;K. Yoshie;Y. Yamaguchi

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We report on the cooperative photoluminescence (PL) properties of closely packed CdSe nanocrystal thin films and propose a model to elucidate the nonlinear PL behavior. The PL exhibits an initial decay and a subsequent enhancement under continuous excitation, which are attributed to the photodarkening and the effects of photooxidation (neutralization and suppression of the photoionization rate). The PL enhancement correlates with the degree of oxidation. X-ray photoelectron spectroscopy (XPS) confirms that photooxidation of nanocrystals proceeds as a function of time.