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

doi:10.1088/1674-1056/22/2/027801

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:Yb^3+/Er³⁺microcrystal produces a high current output. Emission intensity data obtained by photoluminescence suggest that pure hexagonal NaYF₄:Yb^3+/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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Hydrothermal synthesis of hexagonal-phase NaYF4: Er, Yb with different shapes for application as photovoltaic up-converters

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