CdSSe doped aluminophosphate glasses obtained by a wet method

摘要

Aluminophosphate glasses doped with CdS_xSe_(1-x) have been produced by a wet nonconventional method that provides a better homogeneity of the glass matrix. The glass samples belong to the oxide systems:Li_2O-BaO-Al_2O_3-La_2O_3-SiO_2-P_2O_5andLi_2O-Na_2O-BaO-Al_2O_3- La_2O_3-SiO_2-P_2O_5. The band gaps of the doped samples were determined by UV- VIS-NIR transmission spectro-scopy, using the dependence of the absorption coefficient on photon energy. Structural investigations on semicon-ductor doped glasses were performed by infrared absorp-tion and Raman spectroscopy. Infrared absorption spectra revealed structural units of the phosphate glass matrix. Raman spectra obtained by excitation with 458 and 514 nm revealed CdS_(0.696)Se_(0.304)peaks and by excita-tion with 325 nm, revealed the phosphate matrix bonds. Transmission electron microscopy, selected area electron diffraction (SAED) and fluorescence spectroscopy were used to investigate the semiconductor doped glasses. SAED patterns allowed the calculation of the composition and consequently the band gap of the CdSSe crys-tallites embedded in the glass matrix. A strong CdSSe fluorescence was observed, indicating well ordered crys-tallites with a molar fraction of S and Se close to 0.5 as intended.