ChemInform Abstract: Blue-Emitting Phosphor M2B5O9Cl: Eu2+ (M: Sr, Ca) for White LEDs.

✍ Scribed by Chongfeng Guo; Yan Xu; Xu Ding; Ming Li; Jie Yu; Zhaoyu Ren; Jintao Bai

• Publisher: John Wiley and Sons
• Year: 2011
• Weight: 24 KB
• Volume: 42
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.201105004

✦ Synopsis

Blue-Emitting Phosphor M 2 B 5 O 9 Cl: Eu 2+ (M: Sr, Ca) for White LEDs. -The title phosphors are prepared by solid state reaction of stoichiometric amounts of SrCO3 or CaCO3, SrCl2 or CaCl2 (5% excess), H3BO3 (10% excess), and Eu2O3 (corundum crucible, 900 °C, 4 h). The luminescence properties of the as-synthesized phosphors are studied under near-UV excitation. Photoluminescence (PL) spectra reveal a blue emission band, and the emission band shifts to a longer wavelength region as Ca 2+ substitutes Sr 2+ . The highest PL intensity occurs for a Eu 2+ concentration of 0.08, i.e. M1.92Eu0.08B5O9Cl (M: Sr, Ca). Compared to the commercial blue phosphor BaMgAl10O17:Eu 2+ , the title phosphors exhibit a narrower full width at half-maximum and higher PL intensity under near-UV light excitation. -(GUO*, C.;