A series of new glass compositions based on PbX2 (X: Cl, Br or I) have been studied. Binary and ternary glasses resulted from the association of PbI2, Pb-Cl-2, AgI, KCl and KBr. By means of differential scanning calor...A series of new glass compositions based on PbX2 (X: Cl, Br or I) have been studied. Binary and ternary glasses resulted from the association of PbI2, Pb-Cl-2, AgI, KCl and KBr. By means of differential scanning calorimetry (DSC), the mechanism and kinetics of crystallization process were studied. X-ray diffraction studies demonstrate that there is the formation of complicated crystalline phases in crystallized lead iodide based glasses. By heat treating halide glasses of appropriate composition under adequate heating temperature and duration, the lead iodide based glasses could be converted into glass-ceramics with microcrystal size less 1 mu m of which mechanical properties are improved.展开更多
Upconversion luminescence of Er3+/Yb3+-doped halide tellurite glass is investigated experimentally upon 976-nm excitation. Three intense emissions centered at 525, 545 and 655 nm owing to the transitions 2H11/2-4I15/2...Upconversion luminescence of Er3+/Yb3+-doped halide tellurite glass is investigated experimentally upon 976-nm excitation. Three intense emissions centered at 525, 545 and 655 nm owing to the transitions 2H11/2-4I15/2, 4S3/2 -4I15/2 and 4F9/2-4I15/2, respectively, are observed when pumping power is as low as 20 mW. The upconversion mechanisms and power dependent intensities are discussed. The high-populated 4I11/2 level is supposed to serve as the intermediate state responsible for the upconversion processes.展开更多
基金This project was supported by the National Natural Science Foundation of China and the Foundation of the State Commission of Education
文摘A series of new glass compositions based on PbX2 (X: Cl, Br or I) have been studied. Binary and ternary glasses resulted from the association of PbI2, Pb-Cl-2, AgI, KCl and KBr. By means of differential scanning calorimetry (DSC), the mechanism and kinetics of crystallization process were studied. X-ray diffraction studies demonstrate that there is the formation of complicated crystalline phases in crystallized lead iodide based glasses. By heat treating halide glasses of appropriate composition under adequate heating temperature and duration, the lead iodide based glasses could be converted into glass-ceramics with microcrystal size less 1 mu m of which mechanical properties are improved.
基金This work was supported by Shanghai Science and Technology Foundation(022261046) and the National Natural Science FOundation(60207006)
文摘Upconversion luminescence of Er3+/Yb3+-doped halide tellurite glass is investigated experimentally upon 976-nm excitation. Three intense emissions centered at 525, 545 and 655 nm owing to the transitions 2H11/2-4I15/2, 4S3/2 -4I15/2 and 4F9/2-4I15/2, respectively, are observed when pumping power is as low as 20 mW. The upconversion mechanisms and power dependent intensities are discussed. The high-populated 4I11/2 level is supposed to serve as the intermediate state responsible for the upconversion processes.
