Open Access Nano Express

Near-infrared quantum cutting in Ho3+, Yb3+-codoped BaGdF5 nanoparticles via first- and second-order energy transfers

Linna Guo, Yuhua Wang*, Jia Zhang, Yanzhao Wang and Pengyu Dong

Author affiliations

Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, People's Republic of China

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Citation and License

Nanoscale Research Letters 2012, 7:636  doi:10.1186/1556-276X-7-636

Published: 22 November 2012

Abstract

Infrared quantum cutting involving Yb3+ 950–1,000 nm (2 F5/22 F7/2) and Ho3+ 1,007 nm (5S2,5F45I6) as well as 1,180 nm (5I65I8) emissions is achieved in BaGdF5: Ho3+, Yb3+ nanoparticles which are synthesized by a facile hydrothermal route. The mechanisms through first- and second-order energy transfers were analyzed by the dependence of Yb3+ doping concentration on the visible and infrared emissions, decay lifetime curves of the 5 F55I8, 5S2/5F45I8, and 5 F35I8 of Ho3+, in which a back energy transfer from Yb3+ to Ho3+ is first proposed to interpret the spectral characteristics. A modified calculation equation for quantum efficiency of Yb3+-Ho3+ couple by exciting at 450 nm was presented according to the quantum cutting mechanism. Overall, the excellent luminescence properties of BaGdF5: Ho3+, Yb3+ near-infrared quantum cutting nanoparticles could explore an interesting approach to maximize the performance of solar cells.

Keywords:
Near infrared quantum cutting; First- and second-order energy transfers; Back energy transfer; BaGdF5: Ho3+; Yb3+