Infrared to near-infrared and visible upconversion mechanisms in LiYF 4: Yb3+, Ho3+

R. Martín-Rodríguez*, A. Meijerink

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review


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 Yb 3+-doped materials. In this paper we report Ho3+ and Yb3+ upconversion after excitation into the 5I6 Ho3+ state in LiYF4. Infrared excitation into the 5I6 Ho3+ level at 1150 nm induces both visible 5F55I8 Ho3+ and near-infrared 2F5/22F7/2 Yb3+ upconversion luminescence, around 650 nm and 1000 nm, respectively. The concentration dependence was investigated and the most efficient Ho3+ upconversion was found for LiYF4: 2%Yb 3+, 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.

Original languageEnglish
Pages (from-to)147-154
Number of pages8
JournalJournal of Luminescence
Publication statusPublished - 1 Jan 2014


  • Ho
  • Lanthanides
  • Luminescence
  • Solar cells
  • Upconversion mechanisms
  • Yb


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