Effects of additional Ce3+ doping on the luminescence of Li 2 SrSiO4: Eu2+ yellow phosphor

Tae Gon Kim, Hyo Sug Lee, Chun Che Lin, Taehyung Kim, Ru Shi Liu, Ting Shan Chan, Seoung Jae Im

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Abstract

Additional Ce3+ doping improves the luminescence of Li 2 SrSiO4: Eu2+, a yellow phosphor for ultraviolet or blue light-emitting diodes. By examining the photoluminescence of Li2 SrSiO4: Eu2+, Li2 SrSiO 4: Ce3+, and Li2 SrSiO4: Ce 3+, Eu2+, it was confirmed that the energy transfer from Ce3+ to Eu2+ ions contributes little to the enhanced luminescence of Li2 SrSiO4: Ce3+, Eu 2+. Alternatively, we suggested that Ce3+ ions could stabilize the Li vacancies, inhibit the oxidization of Eu2+ to Eu3+, and consequently increase emission intensity, based on the characterizations with decay time and synchrotron light source x-ray absorption measurements. The proposed argument was validated with first principle calculations of the defect formation energies.

Original languageEnglish
Article number061904
JournalApplied Physics Letters
Volume96
Issue number6
DOIs
Publication statusPublished - Feb 22 2010
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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