Enhanced red emission of CaMoO4:Eu3+phosphor by structural adjustment for white light-emitting diodes application

✍ Scribed by Zhang, Zhan Hui ;Huang, Qiang ;Zhao, Xu ;Huang, Zhi Liang

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 182 KB
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200925086

✦ Synopsis

Abstract

Na^+^ was incorporated into red‐emitting CaMoO~4~:Eu^3+^ phosphor to form solid solutions and reduce the crystal symmetry. For a fixed Eu^3+^ concentration, the luminescent properties as a function of Na^+^ concentrations were systematically studied under near‐ultraviolet (UV) excitation. Enhanced red emission at 613 nm was observed and the strongest intensity was 4.5 times that of the sample without Na^+^. Differing from the charge‐compensation mechanism, this enhancement was related to the structural distortion and decreasing centrosymmetry. The increased ratios of red emission (^5^D~0~ → ^7^F~2~) to orange (^5^D~0~ → ^7^F~1~) in intensity revealed that the structural adjustment was achieved in the phosphors via the incorporation of Na^+^.