Optical Functions and Luminescence Quantum Yield of Lead Tungstate

The reflectivity and the quantum yield of the ‘blue’ and ‘green’ luminescence bands of high-purity PbWO4 single crystals were investigated in a wide excitation energy region from 3.5 up to 35 eV at 10 K. The results of Kramers-Kronig calculations of other optical functions of lead tungstate in the fundamental absorption region are presented. The analysis of the quantum yield spectra of ‘blue’ and ‘green’ luminescence allows to estimate the band gap of lead tungstate and to identify the mechanisms of energy transfer to the luminescence centres responsible for blue and green emission.