High pressure luminescence of

✍ Scribed by S. Mahlik; M. Grinberg; E. Cavalli; M. Bettinelli; P. Boutinaud

• Book ID: 103882213
• Publisher: Elsevier
• Year: 2009
• Tongue: English
• Weight: 388 KB
• Volume: 2
• Category: Article
• ISSN: 1875-3892
• DOI: 10.1016/j.phpro.2009.07.044

✦ Synopsis

Photoluminescence and time resolved photoluminescence spectra of YVO 4 doped with Pr 3+ obtained at high hydrostatic pressure up to 76 kbar applied in a diamond anvil cell are presented. At pressures lower than 60 kbar the steady state emission spectra consist of sharp lines peaking between 600 and 625 nm, related to 1 D 2 3 H 4 transition in Pr 3+ and two lines at 475 nm and 575 nm related to an uncontrolled amount of Dy 3+ ions. At pressures above 68 kbar the Pr 3+ and Dy 3+ emission intensity decreases and the corresponding bands are replaced by a broad band peaking at 530 nm attributed to perturbed YVO 4 host luminescence. The quenching of the 1 D 2 3 H 4 emission with increasing pressure is accompanied by a shortening of its lifetime from 12.5 s at ambient pressure to less than 3 s at 60 kbar and has been attributed to nonradiative transition to the charge transfer exciton trapped at Pr 3+ ion (Pr 4+ + electron bound by the Coulomb potential).