Influence in the absorption spectrum of PbWO4 crystal by K+ doping

The positions of the impurity K ion in the crystal are simulated by computer technology. The various kinds of defects corresponding in the K:PbWO4 are calculated. The defect chemistry and the defect reactions with the different impurity concentration doping PWO crystal have been studied. The origin of the decrease of the 350 nm absorption band of K:PbWO4 under low concentration is discussed, and the previous experimental results recur by computer simulation. The calculated results show that the 420 nm absorption band will be eliminated and the property of the light-induced refractive will be enhanced under the condition of heavily doped K:PbWO4.