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

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

    59 Citaten (Scopus)

    Samenvatting

    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+.
    Originele taal-2Engels
    Pagina's (van-tot)23871-23876
    Aantal pagina's6
    TijdschriftJournal of Materials Chemistry
    Volume22
    DOI's
    StatusGepubliceerd - 2012

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