Free and localized excitons in the luminescence spectrum of C60 crystals at high pressure

Autor:	V. D. Negrii, K. P. Meletov
Rok vydání:	1998
Předmět:	Materials science Physics and Astronomy (miscellaneous) Solid-state physics Band gap High pressure Exciton Spectrum (functional analysis) Direct and indirect band gaps Spontaneous emission Atomic physics Luminescence
Zdroj:	Journal of Experimental and Theoretical Physics Letters. 68:248-252
ISSN:	1090-6487 0021-3640
DOI:	10.1134/1.567854
Popis:	The luminescence spectra of C60 single crystals are studied at T≅10 K and pressure up to 4.0 GPa. It is observed that as the pressure increases, one fine-structure band in the spectrum intensifies sharply and dominates at pressures P≥1.7 GPa. The pressure shift of this band is much larger than the shift of other bands in the spectrum, and its magnitude correlates with the pressure dependence of the band gap. It is shown that this band could be due to radiative recombination of free Frenkel excitons.
Databáze:	OpenAIRE
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