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Strobel, Philipp; Niklaus, Robin; Schmidt, Peter J.; Schnick, Wolfgang (2018): Oxoberyllates SrBeO2 and Sr12Be17O29 as Novel Host Materials for Eu2+ Luminescence. In: Chemistry-A European Journal, Vol. 24, No. 48: pp. 12678-12685
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Abstract

Beryllate structures are marginally investigated, but show intriguing structural relations to oxo- and nitridosilicates. A typical feature is the coordination of Be in both trigonal planar and tetrahedral coordination by O. A broad range of structures is accessible by variable combinations of both building units. Three novel ternary Sr-oxoberyllates are characterized by single-crystal X-ray diffraction analysis, density functional theory calculations and investigations on luminescence properties: alpha-SrBeO2, beta-SrBeO2 and Sr12Be17O29 are obtained with oxoberyllate substructures, made up of either BeO3 triangles or BeO4 tetrahedra. The compounds can be described as chain- and layer-type beryllates. When excited with blue light of (In,Ga)N LED chips, beta-SrBeO2 and Sr12Be17O29 show visible emission in the yellow and orange spectral range, respectively, upon doping with Eu2+. Exceptional narrow-band yellow emission (lambda(em)=564 nm, fwhm=55 nm) makes beta-SrBeO2:Eu2+ a promising phosphor for application in phosphor-converted (pc-)LEDs.