Luminescence and Ultrafast Decay Profiles of Nano-Size ZnS:Cu,Al In Sol-Gel Silica Glasses

M. Morita Department of Applied Chemistry, Seikei University, Kichijoji, Musashino-shi, Tokyo, 180-8633, Japan

M. Baba ISSP, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan

D. Rau Department of Applied Chemistry, Seikei University, Kichijoji, Musashino-shi, Tokyo, 180-8633, Japan

M. Koike Department of Applied Chemistry, Seikei University, Kichijoji, Musashino-shi, Tokyo, 180-8633, Japan

K. Takada Department of Applied Chemistry, Seikei University, Kichijoji, Musashino-shi, Tokyo, 180-8633, Japan

T. Ishii Department of Applied Chemistry, Seikei University, Kichijoji, Musashino-shi, Tokyo, 180-8633, Japan

M. Yoshita ISSP, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan

H. Akiyama ISSP, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan

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Abstract

ZnS:Cu,Al nanocrystals are prepared in nanoporous xerogeland sol-gel silica glasses to investigate optical properties by the measurements of luminescence, time-resolved luminescence (TRS) and lifetimes in the temperature range 10-300 v; K. At room temperature, the doped-xerogel represents a green band at 19,000 v; cm m; 1 due to D(donor)-A(acceptor) pair recombinations. Under an excitation by a pico-second UV-laser light (300 v; nm), a combination of blue and green bands is observed in a delay time of 2 v; ns. Luminescence spectral features are associated with D-A pairs and self-activated (SA) centers in the presence of surface-modified defect centers.

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Luminescence and Ultrafast Decay Profiles of Nano-Size ZnS:Cu,Al In Sol-Gel Silica Glasses

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Luminescence and Ultrafast Decay Profiles of Nano-Size ZnS:Cu,Al In Sol-Gel Silica Glasses

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