Visible quantum cutting through downconversion in green-emitting K 2GdF5:Tb3+ phosphors

Te Ju Lee*, Li Yang Luo, Wei-Guang Diau, Teng-Ming Chen, Bing Ming Cheng, Chien Yueh Tung

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

Visible quantum cutting under excitations at 212 and 172 nm in a green-emitting phosphor K2GdF5:Tb3+ (11%) via a downconversion mechanism is investigated. The authors measured the vacuum ultraviolet (VUV) excitation and emission spectra and proposed mechanisms to rationalize the quantum-cutting effect. One short-UV or one VUV photon absorbed by Tb3+ is split into multiple visible photons emitted by Tb 3+ through cross relaxation and direct energy transfer. Calculations indicate an optimal quantum efficiency as great as 189% for this phosphor.

Original languageEnglish
Article number131121
JournalApplied Physics Letters
Volume89
Issue number13
DOIs
StatePublished - 6 Oct 2006

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