White Light-Emitting Diode Lamps Using Oxynitride and Nitride Phosphor Materials. - Ken Sakuma; Naoto Hirosaki; Naoki Kimura; Masakazu Ohashi; Rong-Jun Xie; Yoshinobu Yamamoto; Takayuki Suehiro; Kenichiro Asano; Daiichiro Tanaka (IEICE Trans. Electron., 2005)