The influence of additional doping on the spectroscopic and scintillation parameters of PbWO4 crystals

Abstract

The Yb, ties structural peculiarities and the influence of additional doping of PbW04 crystals with Nb, Bi, and Mg ions have been investigated. It is shown that even a small amount of specific impurileads to an important redistribution of the structural point defects, the radiating centres, and their properties in the crystals. The data have been used for further optimization of PbW04 scintillator development for electromagnetic calorimeter (ECAL) of compact muon solenoid (CMS) at CERN. ') B.P. 110,

Contribution of structural order-disorder to the green photoluminescence ofPbWO4

“…[20][21][22][23] For example, numerous experimental works directed at identifying several types of defects and their spectral roles in PWO have recently been published. [24][25][26][27][28][29] Particularly, there are discussions 30,31 over the contribution of color centers to the photoluminescence ͑PL͒ emission band, mainly to the green emission band. Groenink and Blasse 2 and Korzhik's group 4,7,32,33 concluded that the green emission originated from the ͑WO 3 + F͒ center in undoped PWO crystal, where F is an electron bound to a negative ion vacancy.…”

Influence of trivalent ions codoping on the Mo:PbWO4 luminescence properties

“…So the Mo 6+ ion is presented as an undesired impurity despite the fact that it can increase this material's light yield. Doping by Y 3+ and other selected trivalent ions is found to be the most effective tool for efficient suppression of trapping states, which take part in energy transfer and storage processes [11], or presumably substitute Pb 3+ ions [12] as well with pentevalent Nb-taking sites of tungsten atom [13].…”

Growth of trivalent ions doped PbWO4 crystals and their scintillation properties

“…Doping is another approach to artificially introduce local charge imbalance and thus compensate structure defects [9,10]. Early studies showed that doping by La 3+ and other selected trivalent ions is found to the most effective tool for efficient suppression of trapping states, which take part in energy transfer and storage processes [11], or presumably substitute Pb 3+ ions [12] as well as with pentevalent Nb taking sites of tungsten atom [13].…”