Nonlinear Photoluminescence Behavior in Closely Packed CdSe Nanocrystal Thin Films

1 June 2001

journal article
Published by IOP Publishing in Japanese Journal of Applied Physics

Vol. 40 (6B) , L638-641
https://doi.org/10.1143/jjap.40.l638

Abstract

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.

Keywords

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