论文部分内容阅读
The BaAl2Si2O8:Eu2+blue emitting phosphor was obtained through the one-step calcination process of precursors prepared bychemical co-precipitation method. The phase structure and luminescence propertied of the phosphor were investigated usingX-ray diffraction (XRD) and a fluorescence spectrophotometer. The excitation spectrum exhibited a broad band between 230nm and 400 nm and the emission peaking at about 470 nm was observed, which originated from the allowed f-d transition ofEu2+ions at Ba2+sites. Owing to the different optimal concentrations under different excitation wavelengths (254 nm and 365nm), the energy-transfer mechanism in this phosphor has changed from the dipole-dipole interaction to the exchange interac-tion of Eu2+ions.
The BaAl2Si2O8: Eu2 + blue emitting phosphor was obtained through the one-step calcination process of precursors prepared by chemical co-precipitation method. The phase structure and luminescence propertied of the phosphor were investigated using X-ray diffraction (XRD) and a fluorescence spectrophotometer. excitation spectrum exhibited a broad band between 230 nm and 400 nm and the emission peaking at about 470 nm was observed, which originated from the allowed fd transition of Eu2 + ions at Ba2 + sites. Owing to the different optimal concentrations under different excitation wavelengths (254 nm and 365 nm), the energy-transfer mechanism in this phosphor has changed from the dipole-dipole interaction to the exchange interation of Eu2 + ions.