PHOTOACOUSTIC AND PHOTOLUMINESCENCE STUDIES OF CDSXSE1-X DOPED GLASSES

A series of CdSxSe1-x doped glasses with a mole fraction of sulfur in the range 0.68 less than or equal to x less than or equal to 0.91 is s tudied by photoacoustic (PA) and photoluminescence (PL) methods. Unlik e the usual transmitted optical absorption measurement in which the sa mples have to be thin and have good quality surfaces, the photoacousti c spectroscopy (PAS) measurement yields relatively true optical spectr a even if the glasses are quite thick. From the PA spectra, shifts in absorption bands due to the quantum confinement effect are observed in the glasses having larger x values. The quantum confinement effect be comes larger in glasses with larger mole fractions of sulfur. The size s of the microcrystals are expected to be smaller in the glasses havin g larger x values. This is also consistent with the PL experimental re sults.