Author/Authors :
Yutaka Fujimoto، نويسنده , , Hiroaki Tanno، نويسنده , , Kazuhiro Izumi، نويسنده , , Shigetomo Yoshida، نويسنده , , Shiori Miyazaki، نويسنده , , Masanobu Shirai، نويسنده , , Kouichirou Tanaka، نويسنده , , Yutaka Kawabe، نويسنده , , Eiichi Hanamura، نويسنده ,
Abstract :
Spinel MgAl2O4 crystals doped with transition metals show charge-transfer transitions for Ti:MgAl2O4 on one hand and multiplet transitions of (3d)-electrons for Mn:, Fe:, and Co:MgAl2O4 on the other hand. We will show that optical responses of V:MgAl2O4 are closer to those of Ti:MgAl2O4 and also that white emission spectrum is observed. The microscopic process of the white emission is also proposed.
Keywords :
V:MgAl2O4 , Tungsten-doped spinel , Charge-transfer excitation , Vanadium-doped spinel , color center , Crystalline field splitting
