Structure and photoluminescence properties of Na2Y 2B2O7:Ce3+,Tb3+ phosphors for solid-state lighting application

Dawei Wen, Hui Yang, Guanhui Yang, Jianxin Shi, Mingmei Wu, Qiang Su

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Novel phosphors of Na2Y2B2O 7:Ce3+ and Na2Y2B2O 7:Ce3+,Tb3+ were synthesized by a solid-state process and characterized with X-ray diffraction, photoluminescence (PL), PL excitation (PLE), and fluorescence decay time. The relationship between the observed Ce3+ emission properties and the crystal structure of Na2Y2B2O7 is built and the result shows that Ce3+ ions occupy two non-equivalent Y3+ sites in the host. The codoping of Tb3+ in Na2Y 2B2O7:Ce3+ can tune the emitting colour from blue to green and increase the luminescence quantum efficiency to 75.2% by the energy transfer of Ce3+→Tb3+. The energy transfer processes of Ce3+-Ce3+ and Ce 3+-Tb3+ are analysed and determined to be electric dipole-dipole and dipole-quadrupole, respectively. The broad PLE spectra of Na2Y2B2O7:Ce3+ and Na2Y2B2O7:Ce3+,Tb 3+ are well matched with the emission from near UV LED chips, which indicates that they are promising blue and green phosphors for phosphor-converted white LEDs.

Original languageEnglish
Pages (from-to)65-71
Number of pages7
JournalJournal of Solid State Chemistry
Volume213
DOIs
Publication statusPublished - 2014 May 1
Externally publishedYes

Keywords

  • Energy transfer
  • LED
  • Luminescence
  • Phosphors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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