Electronic structure and photoluminescence properties of Eu2+-activated Ca2BN2F

Y.Q. Li, C.M. Fang, A.C.A. Delsing, G. With, de, H.T. Hintzen

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

The electronic structure of undoped and luminescence properties of Eu2+-doped Ca2BN2F have been investigated. First-principles calculations for Ca2BN2F show that the valence band is mainly composed of F and N 2p, B 2s and 2p orbitals, while the Ca 4s and 3d are almost empty, indicating that Ca2BN2F is a very ionic compound. The valence band close to the Fermi level is dominated by the N 2p states, and the bottom of the conduction band is determined by the Ca 3d and N/B 3s orbitals. The direct energy gap is calculated to be about 3.1 eV, in fair agreement with the experimental data of ~3.6 eV derived from the diffuse reflection spectrum. Due to the high degree of ionic bonding of the coordinations of Eu with (N, F) on the Ca sites, Ca2BN2F:Eu2+ shows strong blue emission with a maximum at about 420 nm upon UV excitation in the absorption range of 330-400 nm. © 2009 Elsevier Inc. All rights reserved.
Original languageEnglish
Pages (from-to)3299-3304
JournalJournal of Solid State Chemistry
Volume182
Issue number12
DOIs
Publication statusPublished - 2009

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