Abstract
Recombination luminescence of a single crystal LiH was studied at various temperatures. Results of decay time measurements and of the temperature dependence of luminescence intensity suggest the formation of (H-2 + e) type relaxed excitons. The emission at 2.5 eV is ascribed to a singlet SA1g of the exciton or to a different mode of relaxation like (LiH+ + e). The transient absorption band at 2.05 eV was ascribed to be due to metastable excitons. It is noted that hydrides are close to iodides in nature.
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