多孔質バイコールガラス坦持CdS微粒子の調製と光学特性

概要

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CdS-microcrystallites were prepared in porous Vycor glass (PVG) by impregnation of PVG with an aqueous solution of Cd(NO_3)_2・4H_20 and subsequent reaction with H_2S gas. The optical absorption edge of the CdS/PVG containing 1.0 wt% cadmium exhibited a blue shift by 0.37 eV compared to bulk CdS, indicating the quantum size effect. The blue shift decreased with increasing diameter of CdS-microcrystallites in PVG. In the photoluminescence spectra of the CdS/PVG, the band-edge emission and the deep-level emission were observed. In accordance with the optical absorption spectra, the blue-shifted band-edge emission was also observed. The deep-level emission was effectively quenched by heating the CdS/PVG up to 300℃ in air or by addition of methyl viologen (MV^<2+>) as an electron acceptor, suggesting that the emission arose from electron-hole pair recombination on the surface of CdS-microcrystallites.
社団法人日本セラミックス協会の論文
1993-08-01