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Low energy tail of the exciton luminescence band in 2H-PbI2and its relation to Urbach rule

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
56
Issue
1
Identifiers
DOI: 10.1016/0038-1098(85)90543-5
Disciplines
  • Physics

Abstract

Abstract We have measured luminescence spectra of 2H-PbI 2 at different temperatures between 77 and 180 K. The lower energy tail of the luminescence band due to free exciton annihilation decreases exponentially with decreasing the photon energy over an order of magnitude, which corresponds to the Urbach tail in the absorption spectrum. This fact suggests that the exciton state corresponding to the exponential tail is in the thermal equilibrium and the steepness coefficient δ 0 = 1.67 in Urbach rule is obtained also from the luminescence spectra.

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