Optical and Spectral Parameters in Ce3+-Doped Gadolinium Gallium Aluminum Garnet Glass-Ceramics
GONG Hua1, ZHAO Xin2, YU Xiao-bo1, Setsuhisa Tanabe3, LIN Hai1*
1.School of Chemical Engineering and Materials, Dalian Polytechnic University, Dalian 116034, China 2.School of Information Science and Engineering, Dalian Polytechnic University, Dalian 116034, China 3.Graduate School of Human and Environmental Studies, Kyoto University, Kyoto-Ku 606-8501, Japan
Abstract：The crystalline phases of Ce3+-doped gadolinium gallium aluminum garnet (GGAG) glass-ceramics were investigated by X-ray diffraction, and the fluorescence spectra were recorded under the pumping of blue light-emitting diode (LED) using an integrating sphere of 10-inch in diameter, which connected to a CCD detector.The spectral power distribution of the glass-ceramics was obtained from the measured spectra first, and then the quantum yield was derived based on the photon distribution.The quantum yield of Ce3+ emission in GGAG glass-ceramics is 29.2%, meanwhile, the color coordinates and the correlated color temperature (CCT) of combined white light were proved to be x=0.319, y=0.349 and 6 086 K, respectively.Although the quantum yield is a little smaller than the value in Ce3+-doped YAG glass-ceramics, the CCT of the combined white light is much smaller than that in the latter.The optical behavior of GGAG glass-ceramics provides new vision for developing comfortable LED lighting devices.
Key words：Glass-ceramics;Crystalline phases;Spectral power distribution;Quantum yield;Correlated color temperature
