Spray pyrolysis synthesis of MAl2O4:Eu2+ (M=Ba, Sr) phosphor for UV LED excitation
- Authors
- Chung, Wonkeun; Yu, Hong Jeong; Park, Sun Hee; Chun, Byung-Hee; Kim, Jihyun; Kim, Sung Hyun
- Issue Date
- 1-7월-2011
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Alloy; Phosphors; Light emitting diodes
- Citation
- JOURNAL OF CRYSTAL GROWTH, v.326, no.1, pp.73 - 76
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF CRYSTAL GROWTH
- Volume
- 326
- Number
- 1
- Start Page
- 73
- End Page
- 76
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/112034
- DOI
- 10.1016/j.jcrysgro.2011.01.055
- ISSN
- 0022-0248
- Abstract
- The UV excited green emitting Eu2+-activated BaAl2O4 and SrAl2O4 phosphors were prepared by ultrasonic spray pyrolysis at low temperature. The morphologies of phosphors were spherical and similar to 1 mu m size with non-aggregation. The BaAl2O4:Eu2+ and SrAl2O4: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 5d-4f 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:Eu2+ 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. (C) 2011 Elsevier B.V. All rights reserved.
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