Photoluminescence properties of Yb2+ in CaAlSiN3 as a novel red-emitting phosphor for white LEDs

Zhijun Zhang, O.M. Kate, ten, A.C.A. Delsing, M.J.H. Stevens, Jingtai Zhao, P.H.L. Notten, P. Dorenbos, H.T.J.M. Hintzen

    Research output: Contribution to journalArticleAcademicpeer-review

    69 Citations (Scopus)


    This paper reports on the diffuse reflection spectra, photoluminescence spectra and chromaticity of ytterbium in CaAlSiN3 at room temperature. It can be excited efficiently over a broad spectral range between 280 and 580 nm and exhibits a single intense red emission at 629 nm with a full width at half maximum of 75 nm due to the electronic transitions from the excited state of 4f135d to the ground state 4f14 of Yb2+. The low energy of Yb2+ emission in CaAlSiN3 can be attributed to the large nephelauxetic effect and crystal field splitting due to the coordination of Yb2+ by nitrogen. This novel developed CaAlSiN3:Yb2+, which is the first Yb2+-activated nitride red-emitting phosphor, has potential applications in spectral conversion materials for warm-white LEDs. The width of the emission band, Stokes shift and thermal quenching mechanism of Yb2+ in CaAlSiN3 and (oxy)nitride-based phosphors are discussed and compared with those of Eu2+.
    Original languageEnglish
    Pages (from-to)23871-23876
    Number of pages6
    JournalJournal of Materials Chemistry
    Publication statusPublished - 2012


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