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Chin. Phys. B, 2013, Vol. 22(2): 027801    DOI: 10.1088/1674-1056/22/2/027801
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Hydrothermal synthesis of hexagonal-phase NaYF4: Er, Yb with different shapes for application as photovoltaic up-converters

Wang Dong-Feng (王东丰)a, Zhang Xiao-Dan (张晓丹)a c, Liu Yong-Juan (刘永娟)b, Wu Chun-Ya (吴春亚)a, Zhang Cun-Shan (张存善)b, Wei Chang-Chun (魏长春)a, Zhao Ying (赵颖)a
a Institute of Photo-electronics Thin Film Devices and Technique of Nankai University, Key Laboratory of Photo-electronics Thin Film Devices and Technique of Tianjin, Key Laboratory of Photo-electronic Information Science and Technology (Nankai University), Ministry of Education, Tianjin 300071, China;
b School of Information Engineering. Hebei University of Technology, Tianjin 300071, China;
c State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
Abstract  Hexagonal β-NaYF4 co-doped with Yb3+ and Er3+ is directly synthesized under mild conditions using a hydrothermal method. The variation of the ratio of Ln3+ to F- and ethylenediaminetetraacetic acid (EDTA) causes the shape of the microcrystal to change from microplate to microcolumn. The NaYF4 powder is mixed with polydimethylsiloxane (PDMS) to create an up-converter for thin film amorphous silicon solar cells so as to evaluate the effectiveness of the synthesized material as up-converter. In order to overcome the difficulty in measuring the effectiveness of up-conversion material, a new method of using near infrared illumination to measure the short circuit current densities of solar cells both with and without up-converters is developed. Up-converter with pure hexagonal NaYF4:Yb3+/Er3+microcrystal produces a high current output. Emission intensity data obtained by photoluminescence suggest that pure hexagonal NaYF4:Yb3+/Er3+ microcrystals are more efficient than nanocrystals when used as up-converting phosphors.
Keywords:  up-convesion      NaYF4      hydrothermal method      up-convertor      solar cells  
Received:  14 May 2012      Revised:  12 June 2012      Accepted manuscript online: 
PACS:  78.20.-e (Optical properties of bulk materials and thin films)  
  42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)  
  78.55.-m (Photoluminescence, properties and materials)  
  42.70.Nq (Other nonlinear optical materials; photorefractive and semiconductor materials)  
Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2011CBA00705, 2011CBA00706, and 2011CBA00707); the National Natural Science Foundation of China (Grant No. 60976051); the Science and Technology Support Program of Tianjin, China (Grant No. 12ZCZDGX03600); and the Program for New Century Excellent Talents in University of China (Grant No. NCET-08-0295).
Corresponding Authors:  Zhang Xiao-Dan     E-mail:  xdzhang@nankai.edu.cn

Cite this article: 

Wang Dong-Feng (王东丰), Zhang Xiao-Dan (张晓丹), Liu Yong-Juan (刘永娟), Wu Chun-Ya (吴春亚), Zhang Cun-Shan (张存善), Wei Chang-Chun (魏长春), Zhao Ying (赵颖) Hydrothermal synthesis of hexagonal-phase NaYF4: Er, Yb with different shapes for application as photovoltaic up-converters 2013 Chin. Phys. B 22 027801

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