Crystal structure and optical performance of Al 3+ and Ce 3+ codoped Ca 3 Sc 2 Si 3 O 12 green phosphors for white LEDs

Yun Fang Wu, Ya Han Chan, Yung Tang Nien, In Gann Chen

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Ca3Sc2Si3O12:Ce3+ (CSS:Ce) green phosphors used for white light-emitting diodes (LEDs) are synthesized and codoped with Al3+ via a solid-state reaction method. The crystal structure and vibrational modes are analyzed by X-ray diffraction, Fourier transform infrared spectroscopy, and Raman scattering spectroscopy. The energy transfer behavior and optical performance are characterized by photoluminescence and excitation spectra, quantum efficiency, and time-resolved photoluminescence. The incorporation of Al3+ into CSS:Ce can inhibit the formation of the impurity phases Sc2O3 and CeO 2, improve crystallinity, and enhance the photoluminescence intensity as well as quantum efficiency. The substitution of Sc3+ with Al 3+ increased the crystal field splitting of Ce3+ and resulted in the red shift of photoluminescence. The results show that Ca 3Sc2-xAlxSi3O12:Ce 3+ has high quantum efficiency, making it a promising green phosphor that can be collocated with a commercial 450 nm blue LED and a red phosphor for solid-state lighting applications.

Original languageEnglish
Pages (from-to)234-240
Number of pages7
JournalJournal of the American Ceramic Society
Volume96
Issue number1
DOIs
Publication statusPublished - 2013 Jan 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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