Optical and scintillation properties of bulk ZnO crystal

Single crystal bulk ZnO scintillator grown by the hydrothermal method was tested on its scintillation performances. In X-ray induced radio luminescence spectrum, it exhibited two intense emission peaks at 400 and 550 nm. The former was ascribed to the free and bound exciton related luminescence and the latter to oxygen vacancy related one, respectively. X-ray induced scintillation decay time of the exciton related emission measured by the pulse X-ray streak camera system resulted similar to 4 ns. Finally, the light yield under Am-241 5.5 MeV alpha-ray was examined and it resulted similar to 500 ph/5.5 MeV-alpha. (c) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim