Effect of light scattering on the transmission spectra of organic nanocrystals

Autor:	Selvakumar V. Nair, Takayoshi Kobayashi, Eiji Tokunaga, Kazuya Nakagawa, Heisuke Ishino
Rok vydání:	2011
Předmět:	Crystal Materials science Physics and Astronomy (miscellaneous) Absorption spectroscopy Scattering Extinction (optical mineralogy) Absorption band Exciton Analytical chemistry Physics::Optics Absorption (electromagnetic radiation) Molecular physics Light scattering
Zdroj:	Applied Physics Letters. 99:053304
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.3623434
Popis:	The effect of light scattering on the extinction spectra of organic nanocrystals was investigated by absorption and extinction measurement and by theoretical calculation for typical organic nanocrystals of α-perylene. In the extinction spectra, the exciton band shows a size-dependent redshift and tail toward longer wavelengths due to scattering as the crystal size is increased beyond ∼50 nm. In the absorption spectra, the exciton band blueshifts from that in the bulk crystal for crystal sizes less than ∼200 nm due to the anisotropic exciton structure in perylene. The calculation qualitatively supports these results. The effect of scattering always makes the extinction band redshift from the absorption band.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9b42dc24a5aeb228a8d22db1712bb8c1 https://doi.org/10.1063/1.3623434 Zobrazit plný text záznamu