[12a-PB4-1~23] 13.8 Optical properties and light-emitting devices

[12a-PB4-16] Effect of crystal structure and defect on afterglow property of ZrO₂

〇(M1)Kenji Sawamura¹, Kenichiro Iwasaki¹, Fumitaka Iwakura², Yasushi Nakajima², Takayuki Nakanishi¹, Atsuo Yasumori¹ (1.Tokyo Univ. Science, 2.Daiichi Kigenso)

Keywords:afterglow, Phosphor

Afterglow materials show long persistent luminescence after stopping excitation (usually UV irradiation). It is mainly used as a night-vision materials. Long persistent property is considered to arise from trap levels which can store the photo-excited electrons, while the detail mechanism of trap level is still unclear. Therefore, it is important to make the detail mechanism of trap level cleat in order to control the trap level precisely. In this study, the effects of the reductive annealing and the addition of Y₂O₃ on the long persistent luminescence property of ZrO₂ were investigated to evaluate the influence of crystal structure and lattice defect.