Photoluminescence characteristics of Bi-sensitized YVO4:Eu phosphor
نویسندگان
چکیده
A possibility of YVO4:Eu phosphor as a red phosphor for the application to ultraviolet (UV) light emitting diodes (LEDs) was investigated. Bi was used as a sensitizer for Eu to improve photoluminescence (PL) intensity in the longer wavelengths region than 350 nm and Bi-sensitized YVO4:Eu phosphor was characterized in terms of crystal structure, and PL excitation/emission spectra. Addition of Bi 0.15 mol into YVO4:Eu phosphor improved its PL intensity by 12 times under 365 nm UV radiation. However, a new broad band spectrum at around 552 nm appeared besides very sharp spectrum at 619 nm of Eu ion. By the addition of Bi, PLE intensity in the longer wavelengths than 330 nm was improved. CIE color coordinates of Y0.95xVO4:Eu0.05,Bix phosphor was distributed from red to orange region because of the emission (552 nm) of Bi.
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