Efficient Yellow-Orange Phosphor Lu4Ba2[Si9ON16]O:Eu2+ and Orange-Red Emitting Y4Ba2[Si9ON16]O:Eu2+: Two Oxonitridosilicate Oxides with Outstanding Structural Variety

• Published in: Chemistry of materials Vol. 29; no. 19; pp. 8377 - 8384
• Main Authors: Maak, Christian, Niklaus, Robin, Friedrich, Franziska, Mähringer, Andre, Schmidt, Peter J., Schnick, Wolfgang
• Format: Journal Article
• Language: English
• Published: American Chemical Society 10.10.2017
• ISSN: 0897-4756; 1520-5002
• DOI: 10.1021/acs.chemmater.7b02900

The oxonitridosilicate oxides Y4Ba2[Si9ON16]­O:Eu2+ and Lu4Ba2[Si9ON16]­O:Eu2+ have been synthesized starting from REF3, RE 2O3 (RE = Y, Lu), BaH2, Si­(NH)2, and EuF3 in a radiofrequency furnace at 1550 °C. The crystal structures were solved and refined from single-crystal X-ray data supported with Rietveld refinement on X-ray powder diffraction data. Both compounds are isotypic and crystallize in monoclinic space group P21/c (no. 14) with Z = 4 and a = 6.0756(2), b = 27.0606(9), c = 9.9471(3) Å, and β = 91.0008(8)° for RE = Y and a = 6.0290(3), b = 26.7385(12), c = 9.8503(5) Å, and β = 90.7270(30)° for RE = Lu. The unique crystal structure exhibits a three-dimensional network made up from Q4-type SiN4 and Q3-type SiON3 tetrahedra. Containing 4-fold bridging N[4] atoms in star-shaped units [N[4](SiN3)4] next to N[3], N[2], O[1], and noncondensed oxide ions, the title compounds illustrate the vast structural variety in (oxo)­nitridosilicates. Under excitation with UV to blue light, Y4Ba2[Si9ON16]­O:Eu2+ shows emission in the orange-red spectral range (λmax = 622 nm, full width at half-maximum (fwhm) ≈ 2875 cm–1). Yellow-orange emitting Lu4Ba2[Si9ON16]­O:Eu2+ (λmax = 586 nm, fwhm ≈ 2530 cm–1) exhibits high internal quantum efficiency (IQE) ≈ 85%. This makes Lu4Ba2[Si9ON16]­O:Eu2+ a promising phosphor for low color rendering index (CRI) warm white phosphor converted light emitting diodes (pcLEDs).