Synthesis and characterization of CdSe-doped Li2O-Al2O3-P2O5 glass

The paper presents the synthesis and optical/structural characterization of 1% CdSe-doped Li₂O-Al₂O₃-P₂O₅ glasses as promising materials for temperature sensors based on luminescence. The doped glasses were synthesized by a conventional dry route, embedding the dopant into the molten glass under continuous stirring. UV-Vis absorption revealed characteristic features for CdSe semiconductor with a cut-off correlated with the band gap of the dopant. Structural information was provided by FTIR and Raman spectroscopy. FTIR and Raman maxima are assigned to vibration modes characteristic for the phosphate vitreous network. Fluorescence spectroscopy by 365 nm excitation put in evidence the luminescent emission of the doped glass in the visible range. SEM images show CdSe particles which are responsible for the yellow color of the doped samples, being detected 12-24 nm quantum dots and the smaller particles are under the detection limit.