Absorption and emission due to localized excitons in CsI:Na |
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| Authors: | Olive Lee Hsu Clayton W Bates |
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| Institution: | Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA;Department of Materials Science and Engineering and Electrical Engineering, Stanford University, Stanford, California 94305, USA |
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| Abstract: | The absorption spectra and the characteristic emission and excitation spectra of CsI:Na bulk crystals at temperatures between 300 K and 4.2 K are reported. Localized exciton energies were calculated by considering a Born-Haber cycle. The results were compared with the experimental results and the origins of the absorption bands were identified. The characteristic emission spectrum consists of two bands, one peaking around 4200 Å, the other around 3800 Å. The corresponding excitation spectra show that this emission is due to the recombination of a relaxed exciton which was created by transferring an electron from an iodine ion to a substitutional sodium ion in an otherwise perfect CsI lattice. |
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