Spray pyrolysis synthesis of MAl2O4:Eu2 (M=Ba, Sr) phosphor for UV LED excitation

Wonkeun Chung, Jeong Yu Hong, Hee Park Sun, Byung Hee Chun, Jihyun Kim, Hyun Kim Sung

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The UV excited green emitting Eu2-activated BaAl 2O4 and SrAl2O4 phosphors were prepared by ultrasonic spray pyrolysis at low temperature. The morphologies of phosphors were spherical and ∼1 μm size with non-aggregation. The BaAl2O4:Eu2 and SrAl2O 4:Eu2 were efficiently excited under UV range from 320 to 370 nm, and exhibited broad band emission at about 500 and 520 nm, respectively, corresponding to the 5d4f transition of Eu2. The detailed properties of crystal structure and luminescence behaviors were discussed by measurements of X-ray diffraction and photoluminescence. Phosphor conversion LEDs were fabricated by combining GaN-based 380 nm emitting UV LED as an optical pumping source with the prepared phosphors. The BaAl2O4:Eu 2 phosphor LEDs showed the CIE coordinate of (0.171, 0.432) in bluish-green emission, and SrAl2O4:Eu2 phosphor LEDs showed that of (0.224, 0.518) in green emission.

Original languageEnglish
Pages (from-to)73-76
Number of pages4
JournalJournal of Crystal Growth
Volume326
Issue number1
DOIs
Publication statusPublished - 2011 Jul 1

Keywords

  • B1. Alloy
  • B2. Phosphors
  • B3. Light emitting diodes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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