Abstract
Abstract This paper reports the results of a time-resolved photoluminescence and energy transfer processes study in Ce 3+ doped SrAlF 5 single crystals. Several Ce 3+ centers emitting near 4 eV due to 5d-4f transitions of Ce 3+ ions substituting for Sr 2+ in non-equivalent lattice sites were identified. The lifetime of these transitions is in the range of 25–35 ns under intra-center excitation in the energy region of 4–7 eV at T = 10 K. An effective energy transfer from lattice defects to dopant ions was revealed in the – 7–11 eV energy range. Both direct and indirect excitation channels are efficient at room temperature. Excitons bound to dopants are revealed at T = 10 K under excitation in the fundamental absorption region above 11 eV, as well as radiative decay of self-trapped excitons resulting in luminescence near 3 eV.
Highlights
SrAlF5 (SAF) crystals have recently become promising candidates for the realization of all-solid-state lasers and other nonlinear optical applications which operate in the ultraviolet and vacuum ultraviolet (VUV) spectral range
Several Ce3þ centers emitting near 4 eV due to 5d-4f transitions of Ce3þ ions substituting for Sr2þ in non-equivalent lattice sites were identified
The main goal of the present work is the investigation of luminescence under direct intra-center excitation of Ce3þ ions and through energy transfer processes from the host to dopants by electronic excitations resulting from absorption of VUV photons
Summary
SrAlF5 (SAF) crystals have recently become promising candidates for the realization of all-solid-state lasers and other nonlinear optical applications which operate in the ultraviolet and vacuum ultraviolet (VUV) spectral range. There are only few works devoted to the spectroscopical properties of rare earth ions in SrAlF5 host lattice. Photon cascade emission in the Pr3þ:SrAlF5 system (Potapov et al, 2005), the properties of Ce3þ ions (Dubinskii et al, 1998) and Sm2þ ions by (Penhouet and Hagemann, 2008) have been investigated. We have studied lattice defects and electronic excitations in pure SrAlF5 crystals (Pustovarov et al, 2008, in press). The main goal of the present work is the investigation of luminescence under direct intra-center excitation of Ce3þ ions and through energy transfer processes from the host to dopants by electronic excitations resulting from absorption of VUV photons. A preliminary report on the present research was published in (Omelkov et al, in press)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
