White-light emission of ZnO nanoparticles prepared by sol–gel method

doi:10.1088/1674-1056/20/12/127102

Abstract In:ZnO nanoparticles are prepared by the sol-gel process. The ratios of In/(Zn+In) are 0%, 5%, 8%, 10%, and 15%, respectively. Crystal phase structures and optoelectronic properties of these samples are characterized and the chromaticity coordinates of different samples are also calculated in CIE-XYZ colour system. The results show that preferred growth direction of ZnO changes from (002) plane to (001) plane and interplanar distance becomes shorter. When the doping amount of In is 5%, Zn atoms are completely replaced by In atoms. The resistivities of the samples first decrease, then increase afterwards with the increase of the amount of In. With the increase of In, the ultraviolet emission is redshifted and new peaks occur at 465 nm, 535 nm, and 630 nm. The sample with 10% indium has white-light emission. The band structures of samples with 0% and 12.5% indium are investigated by the first principle method. The mechanism of white emission is discussed from the viewpoint of additional energy levels.

Keywords: sol-gel resistivity chromaticity coordinate white-light emitting first principle

Received: 22 April 2011
Revised: 26 June 2011
Accepted manuscript online:

PACS:	71.55.Gs	(II-VI semiconductors)
	73.61.Ga	(II-VI semiconductors)
	78.66.Hf	(II-VI semiconductors)

Fund: Project supported by the Natural Science Foundation of Shandong Province of China (Grant No. Y2007G14), the Science and Technology Development Projects of Shandong Province of China (Grant Nos. 2009GG2003028 and 2010G0020423), the Doctoral Foundation of University of Jinan, China (Grant No. XBS0845), the Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, China (Grant No. 2010L0101), and the Scientific Research Foundation of University of Jinan, China (Grant No. XKY1029).

Cite this article:

Li Shi-Shuai(李世帅), Zhang Zhong(张仲), Hang Jin-Zhao(黄金昭), Feng Xiu-Peng(冯秀鹏), and Liu Ru-Xi(刘如喜) White-light emission of ZnO nanoparticles prepared by sol–gel method 2011 Chin. Phys. B 20 127102

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