Recombination luminescence between trapped electrons and self-trapped holes in SrCl2doped with alkali cations after X-irradiation
- 14 July 1977
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 10 (13) , 2285-2293
- https://doi.org/10.1088/0022-3719/10/13/005
Abstract
After X-irradiation in the range 10-145K, SrCl2 doped with M+(M+=Na+,K+,Rb+) gives rise to a post-luminescence whose spectrum, independent of the M+ cation nature, is formed principally of a broad band at 500 nm. The hyperbolic law of isothermal decay of post-luminescence (It=C N0-t where N0 is the initial number of Vk centres) suggests that this emission is due to a tunnelling recombination between Vk and perturbed F-centres. While between 10 and 38K the coefficient C does not depend on T, at higher temperatures the value of C is very sensitive to the X-irradiation temperature. In particular, in the range 35-100K, the behaviour of the coefficient C with temperature is well explained by the motion of Vk-centres viewed as small polarons.Keywords
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