Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7907902 | Optical Materials | 2017 | 6 Pages |
Abstract
Trace alkali metal ions doped elpasolite K2LiAlF6:X+, Mn4+ (XÂ =Â Li, Na, K) was studied as a red phosphor for white light emitting diodes (WLEDs). It exhibited red emission consisted of a series of narrow bands in the spectral range from 610 to 650Â nm. The excitation bands were mainly centered at 360Â nm and 465Â nm, which matches well with emission of the UV and blue LED chips. The energy levels of Mn4+ in K2LiAlF6 were calculated using the exchange charge model of crystal field. The effects of trace alkali metal ions (Li+, Na+, K+) doping on the morphology and photoluminescence properties were investigated in detail. The emission intensity of K2LiAlF6:0.5 %K+, 3 %Mn4+ was enhanced obviously, which is 25 times higher than that one of the samples without alkali metal ions.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yiwen Zhu, Yong Liu, Mikhail G. Brik, Lin Huang, Tongtong Xuan, Jing Wang,