Optical functions and luminescence quantum yield of lead tungstate

The reflectivity and the quantum yield of the 'blue' and 'green' luminescen ce bands of high-purity PbWO4 single crystals were investigated in a wide e xcitation energy region from 3.5 up to 35 eV at 10 K. The results of Kramer s-Kronig calculations of other optical functions of lead tungstate in the f undamental absorption region are presented. The analysis of the quantum yie ld spectra of 'blue' and 'green' luminescence allows to estimate the band g ap of lead tungstate and to identify the mechanisms of energy transfer to t he luminescence centres responsible for blue and green emission.