Journal
JOURNAL OF LUMINESCENCE
Volume 147, Issue -, Pages 147-154Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2013.11.008
Keywords
Upconversion mechanisms; Luminescence; Lanthanides; Solar cells; Ho3+; Yb3+
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Funding
- EU-FP7 NanoSpec programme (NMP) [246200]
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Upconversion materials have regained interest in recent years due to their potential to enhance the efficiency of solar cells. The research has focused on lanthanide based upconverters, especially Er3+- and Yb3+-doped materials. In this paper we report Ho3+ and Yb3+ upconversion after excitation into the I-5(6) Ho3+ state in LiYF4. Infrared excitation into the I-5(6) Ho3+ level at 1150 nm induces both visible F-5(5) -> I-5(8) Ho3+ and near-infrared F-2(5/2) -> F-2(7/2) Yb3+ upconversion luminescence, around 650 nm and 1000 nm, respectively. The concentration dependence was investigated and the most efficient Ho3+ upconversion was found for LiYE4: 2%Yb3+, 20%Ho3+. Time-resolved spectroscopy as well as temperature dependent measurements were used to unravel the mechanism underlying the upconversion processes. Experimental results and rate equation modeling provides evidence for infrared to near-infrared/visible upconversion mechanisms that are different from those previously reported in the literature. (C) 2013 Elsevier B.V. All rights reserved.
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