LI Yang;HU Li-Li;YANG Bo-Bo;SHI Ming-Ming;ZOU Jun
Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences;University of Chinese Academy of Sciences;School of Material Science and Engineering, Shanghai Institute of Technology;Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences;School of Science, Shanghai Institute of Technology;School of Science, Shanghai Institute of Technology;School of Science, Shanghai Institute of Technology
The color conversion glass is a promising material for light emitting diodes encapsulation due to its high thermal conductivity and good thermal stability. In present study, color conversion glasses were prepared by sintering a mixture of borosilicate glass frits and a YAG phosphor at temperature from 600 °C to 900 °C. The effects of sintering temperature on luminescence properties were examined. Characteristics of color conversion glasses, with respect to luminescence intensity, CIE (Commission International de I’Eclairage) chromaticity and CCT (Correlated Color Temperature) were analyzed based on luminescence excitation and emission spectra. These characteristics are dependent on sintering temperature of the color conversion glasses. The CIE coordinates shift with the increase of sintering temperature. The glass, sintered at 700 °C, shows the best luminescence properties. But for the glasses sintered above 850 °C, their luminescence properties may be destroyed. Test results of X-ray diffraction (XRD), differential scanning calorimetry (DSC)and X-ray photoelectron spectroscopy (XPS) reveal that degradation of luminescence properties with the increase of sintering temperature is ascribed to the lattice disturbance of YAG and oxidation of Ce 3+, which is caused by reactions between glass matrix and YAG phosphors. The present study may promote the application of color conversion glasses in light emitting diodes encapsulation.
Ce:YAG color conversion glass;luminescence intensity;CIE coordinates shift;sintering temperature
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