Laser-induced blue-shift of the photoluminescence from PbS quantum dots in glasses

We report the effects of laser-induced blue-shift of the photoluminescence from PbS quantum dots embedded in the glass matrix. When the excitation irradiance increased from 70 to 850 W/cm2, photoluminescence bands from the PbS quantum dots underwent a blue-shift of ∼60 meV. At the same time, the values of the full width at half maximum (FWHM) intensities increased from 76 to 117 meV. These changes were due to the increase in the local temperatures induced by the excitation beam.