[10a-S223-1~10] 13.8 Optical properties and light-emitting devices

[10a-S223-5] The mechanism of thermal and photo reduction of Eu doped KSr_1-xBa_xPO₄ alloy system

〇Masaya Tsuta¹, Susumu Nakamura², Ariyuki Kato¹ (1.Nagaoka Univ., 2.Nagaoka Inst.)

Keywords:Photo reduction, Thermal reduction, Phosphate phosphor

To obtain the divalent Eu emission from phosphate phosphor which is important for phosphor applications, heat treatments under reducing atmosphere at high temperature are required usually. However, we have found that the divalent emission can be also obtained by laser irradiation. In this study, the KSr_1-xBa_xPO₄:Eu alloy system was irradiated with a laser, and the photo reduction effect was examined in more detail. Based on the results obtained, a reduction scheme was constructed and compared with the results of thermal reduction, the mechanism was discussed thoroughly.