10:30 AM - 10:45 AM [21a-S423-5] First Principle Calculation and Analysis of Surface Defect Levels to Characterize Temperature Dependence of Quantum Efficiency in YAG:Ce3+ Phosphors. 〇Nobuaki Nagao1, Nitta Mitsuru1, Inada Yasuhisa1 (1.Panasonic Corp.)