Anisotropic intrinsic photoluminescence in NaI*

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Abstract
The intrinsic photoluminescence in NaI is observed to have an emission intensity that is direction dependent. The experimental results are explained by calculating the interference between the direct luminescence and that which has undergone internal reflection. The result is a two-parameter theory. The two parameters are the absorption coefficient, α, and the thickness of a nonluminescing “dead” surface layer, d. Typical values are α ~ 107 m-1 and 1.0 × 10-8 m ≤ d ≤ 3.0 × l0-8 m.