Photoluminescence characteristics of ZnO clusters confined in the micropores of zeolite L
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- 作者：Fang Wang ; Hongwei Song ; Guohui Pan ; Libo Fan ; Qilin Dai ; Biao Dong ; Huihui Liu ; Jihong Yu ; Xi Wang ; Li Li
- 关键词：A. Composites ; A. Semiconductors ; D. Optical properties
- 刊名：Materials Research Bulletin
- 出版年：2009
- 出版时间：5 March 2009
- 年：2009
- 卷：44
- 期：3
- 页码：600-605
- 全文大小：1053 K
文摘
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.