Photon cascade luminescence in CaAl12O19 : Pr, Cr

摘要

In this report, the Cr3+ ion was chosen as a co-dopant to modify the unpractical photon cascade emission properties of pr(3+)-doped CaAl12O19 phosphors, which emit one near-UV photon from the S-1(0) state followed by visible photons from the P-3(0) state, into phosphors that emits two visible photons through energy transfer. The photon cascade emission process via energy transfer and the transfer mechanisms were systemically investigated by luminescence spectra and dynamics using synchrotron radiation its one of the excitation sources. The internal visible quantum efficiency of CaAl12O19:Pr, Cr was estimated and compared with CaAl12O19:Pr and the drawback to obtain the visible quantum efficiency higher than unit for CaAl12O19:Pr, Cr as a practical VUV phosphor was also discussed. (C) 2007 Elsevier Inc. All rights reserved.