THE BLUE LUMINESCENCE OF PBWO4 SINGLE-CRYSTALS

The blue emission spectra were measured in three different PbWO4 cryst als at T is an element of (80, 300)K showing rather low or no contribu tion of the green emission band. Non-elementary character of the blue luminescence spectrum is found which is qualitatively the same in all the crystals measured. It is explained by the influence of JT effect o n nearly tetrahedral (WO4)(2-) complex anion, At the same time, anothe r blurring of spectra is observed and is ascribed to small external pe rturbations influencing the final states of JT system mentioned.