Abstract
Absorption, emission and excitation spectra of CsI : Na were measured on bulk single crystals and thin films at room temperature (RT) and liquid nitrogen temperature (LNT) Excitonic absorption peaks as well as absorption in the long-wavelength tail of the fundamental absorption which is not present in pure CsI were observed. In addition to emission at 4250 Å, excitonic emission at 3400 Å, normally found at LNT, has also been observed at RT, This room temperature UV emission is closely related to the heat treatment process that the specimen received.
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