Photoluminescence characteristics of ZnO clusters confined in the micropores of zeolite L |
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Authors: | Fang Wang Hongwei Song Guohui Pan Libo Fan Qilin Dai Biao Dong Huihui Liu Jihong Yu Li Li |
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Affiliation: | a Key Laboratory of Excited State Physics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 16 Eastern South-Lake Road, Changchun 130033, People's Republic of China b Graduate School of Chinese Academy of Sciences, Beijing 100039, People's Republic of China c State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, JiLin University, Changchun 130012, People's Republic of China d State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China |
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Abstract: | Sub-nanometric ZnO clusters were prepared in the micropores of zeolite L by the incipient wetness impregnation method. The X-ray patterns (XRD), transmission electron microscope (TEM), N2 adsorption-desorption isotherms, UV-vis absorption spectra (UV-vis) and photoluminescence spectra (PL) were used to characterize the composite materials. The results indicate that a small amount of sub-nanometric ZnO clusters can be introduced into the channel of zeolite L, however, when the amount of ZnO loading exceeds 20 wt%, macrocrystalline ZnO appears on the external surface of zeolite L. Different from bulk ZnO materials, these sub-nanometric ZnO clusters exhibit their absorption onset below 255 nm and a blue luminescence band in the range of 404-422 nm. The temperature-dependent luminescence demonstrates that the amount of the ZnO loading significantly affects the exciton-phonon interaction between the ZnO clusters and the zeolite host. The ZnO clusters exhibit a picosecond scale emission lifetime at room temperature. |
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Keywords: | A Composites A Semiconductors D Optical properties |
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