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Optical absorption and luminescence energies of F centers in CaO from ab initio embedded cluster calculations

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We calculated the optical absorption and luminescence energies of electrons trapped at oxygen vacancies in CaO using a consistent embedded cluster method which accounts for the long-range polarization effects and partial covalence of CaO. Optical absorption and luminescence energies of neutral 􏰏F center􏰎 and positively charged 􏰏F+ center􏰎 vacancies are calculated by means of time dependent density functional theory using the B3LYP exchange-correlation density functional. Our results demonstrate that using large basis sets to describe a diffuse nature of excited states, and properly accounting for long-range polarization induced by charged and excited defect states, is crucial for accurate predictions of optical excitation and luminescence energies of these defects.

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CARRASCO RODRÍGUEZ, Javier, SOUSA ROMERO, Carmen, ILLAS I RIERA, Francesc, SUSHKO, P.v., SHLUGER, A.l.. Optical absorption and luminescence energies of F centers in CaO from ab initio embedded cluster calculations. _Journal of Chemical Physics_. 2006. Vol. 125, núm. 7, pàgs. 074710-1-074710-9. [consulta: 28 de gener de 2026]. ISSN: 0021-9606. [Disponible a: https://hdl.handle.net/2445/150704]

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