Ambient Dependence of Photoluminescence for ZnO Nanocrystalline Films Synthesized in a Sonochemical Method

초록

We investigated the photoluminescence (PL) spectra of solution-based synthesized ZnO nanocrystalline (NC) films under various ambient conditions. While the PL spectra typically showed a sharp peak near 375nm (near-band-edge, NBE) and a broad structure near 550nm (deep level, DL), the NBE peak was enhanced and the DL emission was significantly suppressed in an O-2-free atmosphere at room temperature. Interestingly, the PL spectra changed in an opposite manner in an O-2-rich atmosphere. These findings indicate that the light emission from ZnO NC films is easily controlled by the O-2 concentration in the atmosphere at room temperature, which is clearly distinguished from the post-annealing effect. (C) 2011 The Japan Society of Applied Physics

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