Fast luminescence of undoped PbWO4 crystal

✍ Scribed by A.N. Belsky; V.V. Mikhailin; A.N. Vasil'ev; I. Dafinei; P. Lecoq; C. Pedrini; P. Chevallier; P. Dhez; P. Martin

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 511 KB
• Volume: 243
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)00896-c

✦ Synopsis

The results of an investigation of PbWO 4 luminescence properties obtained by time-resolved techniques under VUV, X-ray synchrotron radiation and ~-radiation excitation are presented. The fast luminescence in the 430 nm band with fwhm of 0.5 eV is characterized by a decay time of about 4-5 ns under X-ray excitation. A slow luminescence with decay time of more than 1 t~s can be attributed to a green emission band. An intermediate decay time was also detected. This time changes from 20 ns (for 360 nm emission) to 50 ns (for 550 nm). The PbWO 4 fast band excitation spectrum and reflectivity were measured in the fundamental absorption region using VUV synchrotron radiation (4-150 eV). A comparison between these two spectra allowed us to suppose the excitonic type of the excitation mechanism of the fast emission band. The role of Pb 2+ ions in the PbWO 4 luminescence is discussed.