CAJ | 학술논문

通过正电子湮没寿命谱研究了PbWO4晶体退火处理前后缺陷的变化，发现氧退火后，晶体正电子寿命值τ2变小，正电子捕获率κ增大，真空退火反之。并且PbWO4晶体氧退火后发光主峰位从440nm移到485nm的绿光处，而真空退火晶体发射谱谱形并未变化。从不同退火处理对晶体的影响，提出了PbWO4晶体中铅空位形成WO3+O-发绿光的发光模型。
통과정전자인몰수명보연구료PbWO4정체퇴화처리전후결함적변화，발현양퇴화후，정체정전자수명치τ2변소，정전자포획솔κ증대，진공퇴화반지。병차PbWO4정체양퇴화후발광주봉위종440nm이도485nm적록광처，이진공퇴화정체발사보보형병미변화。종불동퇴화처리대정체적영향，제출료PbWO4정체중연공위형성WO3+O-발록광적발광모형。
The change of the defects in PbWO4 crystals before and after annealing was studied by positron annihilation lifetime spectrum. It was found that the lifetime τ2 turned short and the positron capture ability κ increased after oxygen annealing. The results for the case of vacuum annealing were the reverse for that of oxygen annealing. Meanwhile, the main emission peak of the crystal after oxygen annealing shifted from 440nm to 485nm, but the peak for the case of vacuum annealing remained at 440nm, i.e. similar to that of an untreated crystal. From the results affected by different treatments, it is proposed that WO3+O- produced by lead vacancy leads to the green luminescence in PbWO4 crystal.