Y2O2S:Eu3+ nanocrystals, a strong quantum-confined luminescent system

Autor:	Jagannathan Thirumalai, D. C. Trivedi, R. Jagannathan
Rok vydání:	2007
Předmět:	Photoluminescence Chemistry Exciton Biophysics Analytical chemistry General Chemistry Condensed Matter Physics Biochemistry Atomic and Molecular Physics and Optics Nanocrystalline material Blueshift Absorption edge Quantum dot Diffuse reflection Absorption (electromagnetic radiation)
Zdroj:	Journal of Luminescence. 126:353-358
ISSN:	0022-2313
DOI:	10.1016/j.jlumin.2006.08.064
Popis:	Trivalent europium-doped yttrium oxysulfide nanocrystals synthesized using sol–gel thermolysis show significant blue shifts in the excitation bands corresponding to fundamental absorption, charge-transfer absorption. A significant blue shift observed in the fundamental absorption edge for the nanocrystals having an average crystallite size ( φ ) in the range 9–15 nm indicates a strong quantum confinement with a Bohr exciton radius of 5–13 nm. Also, the diffuse reflectance spectra and the corresponding Kubelka–Munk plot indicate the possibility of profound decrease in the absorption coefficient of Eu 3+ –ligand charge-transfer species necessitating further studies in this wide-gap semiconductor nanocrystalline system.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bcb5ad459f720cd349ad7f5e5b37ae8b https://doi.org/10.1016/j.jlumin.2006.08.064 Zobrazit plný text záznamu Full Text from ScienceDirect