Melilite-structure CaYAl3O7:Eu3+ phosphor: Structural and optical characteristics for near-UV LED-based white light

Seung Hyok Park, Kyoung Hwa Lee, Sanjith Unithrattil, Ho Shin Yoon, Ho Gyeom Jang, Won Bin Im

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

A red-emitting phosphor, CaY1-xEuxAl 3O7 (CYA:Eu3+), was prepared by conventional solid-state reaction, and its structural properties were investigated by means of Rietveld refinement method and maximum entropy method using an X-ray source. XRD patterns confirm the tetragonal phase of CYA:Eu3+ phosphors. The photoluminescence properties of the samples were investigated for application to white light-emitting diodes (WLEDs). The emission spectrum is dominated by a red peak located at 616 nm due to the 5D07F2 electric dipole transition of Eu3+ ions. Concentration quenching occurs when the Eu3+ concentration is about 0.35 and the critical transfer distance of the phosphor is also calculated. A white LED fabricated with blue, green, and CYA:Eu3+ red phosphor incorporated with an encapsulant in ultraviolet LEDs (λmax = 396 nm) is discussed.

Original languageEnglish
Pages (from-to)26850-26856
Number of pages7
JournalJournal of Physical Chemistry C
Volume116
Issue number51
DOIs
Publication statusPublished - 2012 Dec 27

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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