Quantum size effects on CdTexS1−x semiconductor‐doped glass

We present experimental evidences of quantum confinement in borosilicate glasses with a new microcrystallite CdTexS1−x semiconductor. The microcrystallite sizes are controlled by the heat‐treatment time and temperature. Transmission electron microscopy measurements show the microcrystallites average diameters near 55 A for the sample treated for the longest time. We observe a red shift from 570 to 640 nm in the absorption and photoluminescence spectra as the size increases. These shifts agree with the expected quantum‐confined energies, varying from 0.80 to 0.60 eV. The absorption spectra also show a second feature which can be assigned to the second quantum‐confined transition.

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