Luminescence Associated with Self-Trapped Excitons in LiI
作者： Hitoshi Nishimura , Yoshimitsu Saka , Shunji Nagata , Satoshi Hashimoto , Takeyuki Okada
DOI: 10.1143/JPSJ.56.3715
关键词: Atomic physics 、 Atmospheric temperature range 、 Liquid helium 、 Rectangular potential barrier 、 Optics 、 Luminescence 、 Photoluminescence 、 Crystal 、 Materials science 、 Exciton 、 Inorganic compound 、 General Physics and Astronomy
摘要: Absorption, luminescence and excitation spectra of LiI crystals have been observed in a wide temperature range. Being extremely hygroscopic, were cleaved liquid helium inside cryostat before optical measurements. With this method crystal cleavage, the spectrum is drastically changed. Experimental results led to following conclusions: (1) steepness constant exciton absorption (Urbach) tail 0.87, (2) at least one self-trapped state stably exists, (3) from band peaking 3.4 eV occurs (4) potential barrier between free states 55 meV. A possibility be three-center type discussed.
harvard.edu
jps.jp
sci-hub.se 参考文章(27)
Y. Nakaoka, Crystal Structure Dependence of Hole Stability in Ionic Crystals physica status solidi (b). ,vol. 127, pp. 327- 338 ,(1985) , 10.1002/PSSB.2221270133
Herbert Mahr, Ultraviolet Absorption of KI Diluted in KCl Cryst als Physical Review. ,vol. 125, pp. 1510- 1516 ,(1962) , 10.1103/PHYSREV.125.1510
Hitoshi Nishimura, Structure of excitation spectra of luminescence induced by photo-generated excitons in alkali iodide crystals Journal of Luminescence. ,vol. 36, pp. 75- 83 ,(1986) , 10.1016/0022-2313(86)90055-4
M. Matsuura, H. Büttner, Optical properties of excitons in polar semiconductors: Energies, oscillator strengths, and phonon side bands Physical Review B. ,vol. 21, pp. 679- 691 ,(1980) , 10.1103/PHYSREVB.21.679
Takashi Eshita, Katsumi Tanimura, Noriaki Itoh, Hitoshi Nishimura, Two Slowly Decaying Luminescence Bands in Alkali Iodides Journal of the Physical Society of Japan. ,vol. 54, pp. 4418- 4430 ,(1985) , 10.1143/JPSJ.54.4418
Y. Petroff, R. Pinchaux, C. Chekroun, M. Balkanski, Hiroshi Kamimura, Excitonic Structure of Alkali Halides Physical Review Letters. ,vol. 27, pp. 1377- 1380 ,(1971) , 10.1103/PHYSREVLETT.27.1377
A. Barry Kunz, Combined Plane-Wave Tight-Binding Method for Energy-Band Calculations with Application to Sodium Iodide and Lithium Iodide Physical Review. ,vol. 180, pp. 934- 941 ,(1969) , 10.1103/PHYSREV.180.934
Takehisa Yoshinari, Masamitsu Hirai, Exciton-Phonon Coupling in KI and RbI under Two-Photon Excitation Journal of the Physical Society of Japan. ,vol. 39, pp. 720- 725 ,(1975) , 10.1143/JPSJ.39.720
J.U. Fischbach, D. Fröhlich, M.N. Kabler, Recombination luminescence lifetimes and the self-trapped excition in alkali halides Journal of Luminescence. ,vol. 6, pp. 29- 43 ,(1973) , 10.1016/0022-2313(73)90092-6
T Higashimura, Y Nakaoka, T Iida, Stability and optical properties of self-trapped exciton in alkali halides Journal of Physics C: Solid State Physics. ,vol. 17, pp. 4127- 4140 ,(1984) , 10.1088/0022-3719/17/23/013