The application at medium and low energies of lead tungstate scintillators,
so far optimized for the ECAL calorimeter of CMS for the future LHC, is st
rongly limited by their poor light yield. Suitable dopants like molybdenum
and terbium can help to overcome this problem. Concepts, results, advantage
s and drawbacks of this approach are discussed. (C) 2000 Elsevier Science B
.V. All rights reserved.