SIZE EFFECTS OF EXCITONS OFBiI3IN LAYERED MATRICES

T. Komatsu, D. Kim, T. Kobayashi, K. Watanabe, V.F. Aguekian, T. Karasawa, I. Akai and T. Iida
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T. Komatsu: Department of Physics, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan
D. Kim: Department of Physics, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan
T. Kobayashi: Department of Physics, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan;
K. Watanabe: Department of Physics, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan;
V.F. Aguekian: Department of Physics, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan;
T. Karasawa: Department of Physics, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan
I. Akai: Department of Physics, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan
T. Iida: Department of Physics, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 1127-1131

Abstract: The size effects on the exciton absorption and luminescence spectra are studied in nanostructure ofBiI3embedded in the matrices of bulkBiI3andCdI2crystals. The quantum-confined exciton states are observed as the absorption lines of the seriesWJ(J=I, II, III, …). The results are compared with a model calculation of the confined excitons in the disks with thicknessLzand radius R. The disk-size distribution is directly observed with a high-resolution electron microscope. The relaxed luminescence from theBiI3disks inCdI2matrix is analyzed by the model of the confined excition interacting with acoustic phonons by taking into account the size-dependent Stokes shift and the distribution of the disk size.

Date: 1996
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DOI: 10.1142/S0218625X96002011

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