Ultraviolet emissions from Gd3 ions excited by energy transfer from Ho3 ions

Ying Yu, Yangdong Zheng, Zhemin Cheng, Dan Wang, Lixin Liu, Feng Qin, Changbin Zheng, Zhiguo Zhang, Wenwu Cao

Research output: Contribution to journalArticle

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Abstract

Ultraviolet (UV) upconversion (UC) emissions of Gd3 ion were investigated in Y1.838-xGdxYb0.16Ho 0.002O3 (x=0, 0.16, 0.4, 1, 1.4) bulk ceramics under 976 nm laser diode (LD) excitation. The UC emissions centered at 309 and 315 nm are assigned to the transition of 6P5/28S7/2 (Gd) and 6P7/28S7/2 (Gd). The 6PJ levels of Gd3 ions are populated by an energy transfer (ET) process from 8S7/2 (Gd)(3P1, 3L 8, 3M10) (Ho)→6PJ (Gd)5I8 (Ho). A four-photon ET UC process was confirmed by the dependence of the 6P7/2 level emission intensity on the pumping power. We found that the intensity of the UC emissions increased with Gd3 ion concentration and peaked at 8 mol%, then starts to decrease until the Gd3 ion concentration reached 70 mol%. The variation in the UV emission intensity is the result of the competition between the ET process and concentration quenching effect. Theoretical calculations based on steady-state equations validated the proposed UC mechanisms.

Original languageEnglish (US)
Pages (from-to)347-351
Number of pages5
JournalJournal of Luminescence
Volume131
Issue number2
DOIs
Publication statusPublished - Feb 1 2011

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All Science Journal Classification (ASJC) codes

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

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