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Pösl, Christine; Schnick, Wolfgang (2017): Crystal Structure and Nontypical Deep-Red Luminescence of Ca3Mg[Li2Si2N6]:Eu2+. In: Chemistry of Materials, Vol. 29, No. 8: pp. 3778-3784
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Abstract

Rare-earth-doped nitridosilicates exhibit outstanding luminescence properties and have been intensively studied for solid-state lighting. Here, we describe the new nitridolithosilicate Ca3Mg-[Li2Si2N6]:Eu2+ with extraordinary luminescence characteristics. The compound was synthesized by the solid-state metathesis reaction in sealed Ta ampules. The crystal structure was solved and refined on the basis of single-crystal X-ray diffraction data. Ca3Mg[Li2Si2N6]:Eu2+ crystallizes in the monoclinic space group C2/m (no. 12) [Z = 4, a = 5.966(1), b = 9.806(2), c = 11.721(2) angstrom, beta = 99.67(3)degrees, V = 675.9(2)angstrom(3)] and exhibits a layered anionic network made up of edge- and corner sharing LiN4 tetrahedra and [Si2N6](10-) bow-tie units. The network charge is compensated by Ca2+ and Mg2+ ions. Upon irradiation with UV to blue light, red emission at exceptionally long wavelengths (lambda(em) = 734 nm, fwhm approximate to 2293 cm(-1)) is observed. According to emission in the near-infrared, application in LEDs for horticultural lighting appears promising.