Luminescence of impurity-bound excitons in corundum

Autor:	B. R. Namozov, V. A. Vetrov, R. I. Zakharchenya, S. M. Muradov
Rok vydání:	2002
Předmět:	Ionic radius Materials science Exciton Electron shell Condensed Matter Physics Electronic Optical and Magnetic Materials Physics::Popular Physics Condensed Matter::Materials Science Absorption edge Computer Science::Sound Impurity Energy level Atomic physics Luminescence Biexciton
Zdroj:	Physics of the Solid State. 44:1459-1462
ISSN:	1090-6460 1063-7834
DOI:	10.1134/1.1501337
Popis:	The luminescence characteristics of M3+: Al2O3 crystals, where M3+ stands for an isoelectronic cation impurity with a filled electron shell, namely, Sc3+, Y3+, or La3+, were studied. The luminescence of excitons bound (BE) to these impurities was detected. The position of the BE energy states at the long-wavelength absorption edge as a function of the M3+ ionic radius was established. The energies of the long-wavelength BE creation threshold and of the maximum of the BE luminescence band were approximated empirically by third-order polynomials of the Toyozawa polynomial type, which describes electron-phonon interaction. The energy and spatial structure of the BE was found to be similar to that of a self-trapped exciton (STE). The BE and STE states are separated by an energy barrier, and energy transfer from the STE to BE is frozen at low temperatures.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ecde4a2acc5008ed38be306bf5d8b855 https://doi.org/10.1134/1.1501337 Zobrazit plný text záznamu Full text from SpringerLink