☆ 4.4 Article

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

JOURNAL OF CRYSTAL GROWTH (2011)

期刊

JOURNAL OF CRYSTAL GROWTH

卷 326, 期 1, 页码 73-76

出版社

ELSEVIER

DOI: 10.1016/j.jcrysgro.2011.01.055

关键词

Alloy; Phosphors; Light emitting diodes

类别

Crystallography Materials Science, Multidisciplinary Physics, Applied

资金

Carbon Dioxide Reduction and Sequestration Center
Ministry of Education, Science and Technology of Korea

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Protocol

Reagent

摘要

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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