[19p-P9-1~20] 13.8 Optical properties and light-emitting devices

[19p-P9-17] Analyses based on one-dimensional random walk for the long lasting phosphorescence (LLP) in Mn²⁺ ions doped divalent metal phosphate

〇Kai Ikegaya¹, Kazuteru Shinozaki¹, Shigeki Yamada¹ (1.Yokohama City Univ.)

Keywords:long lasting phosphorescence, one-dimensional random walk, divalent manganese ion

A mechanism of long lasting phosphorescence (LLP) has been discussed mainly for band structure. Although Mn²⁺ ions doped Zn₃(PO₄)₂ have a band gap of about 6.9 eV, red LLP was observed by using excitation at 4.9 eV. Thus, it was thought that the LLP is not able to be applied for band structure. For that reason, we applied one-dimensional random walk model to the LLP without band structure. As a result, we succeeded in reproducing experimental LLP intensity change in time for Mn²⁺ ions doped Zn₃(PO₄)₂ using the simulation.