Abstract
By measurements of luminescence and the Urbach tail of indirect absorption, exciton states were investigated in mixed crystals of thallous halides for a wide range of compositions. From the estimation of the steepness coefficients of the Urbach tail in TlCl x Br 1- x mixed crystals, the relaxed exciton state was found to change from the self-trapped state to the free state at x =0.7-0.6, consistent with the results of the emission studied before. On the other hand, the indirect excitons in TlBr x I 1- x (0.3< x <1) were found, upon analysis of the emission band and the steepness coefficient of the Urbach tail, to relax always to the self-trapped states, which become shallow with increasing iodine concentration. Exciton states in mixed thallous halides are discussed together with a theoretical study on a binary mixed crystal and in relation to percolation of minority-halogen ion clusters.
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