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

✍ Scribed by Wonkeun Chung; Hong Jeong Yu; Sun Hee Park; Byung-Hee Chun; Jihyun Kim; Sung Hyun Kim

• Book ID: 104022334
• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 591 KB
• Volume: 326
• Category: Article
• ISSN: 0022-0248
• DOI: 10.1016/j.jcrysgro.2011.01.055

✦ Synopsis

The UV excited green emitting Eu 2 + -activated BaAl 2 O 4 and SrAl 2 O 4 phosphors were prepared by ultrasonic spray pyrolysis at low temperature. The morphologies of phosphors were spherical and $ 1 mm size with non-aggregation. The BaAl 2 O 4 :Eu 2 + and SrAl 2 O 4 :Eu 2 + 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 Eu 2 + . 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 BaAl 2 O 4 :Eu 2 + phosphor LEDs showed the CIE coordinate of (0.171, 0.432) in bluish-green emission, and SrAl 2 O 4 :Eu 2 + phosphor LEDs showed that of (0.224, 0.518) in green emission.