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• 作者：Philipp Strobel ; Volker Weiler ; Cora Hecht ; Peter J. Schmidt ; Wolfgang Schnick
• 刊名：Chemistry of Materials
• 出版年：2017
• 出版时间：February 14, 2017
• 年：2017
• 卷：29
• 期：3
• 页码：1377-1383
• 全文大小：393K
• ISSN：1520-5002

文摘

The nitridomagnesosilicates Li<sub>2sub>Ca<sub>2sub>[Mg<sub>2sub>Si<sub>2sub>N<sub>6sub>]:Eu<sup>2+sup> and Li<sub>2sub>(Ca<sub>1.88sub>Sr<sub>0.12sub>)[Mg<sub>2sub>Si<sub>2sub>N<sub>6sub>]:Eu<sup>2+sup> show narrow-band red emission at 638 and 634 nm, respectively, with an emission bandwidth of 62 nm (∼1513 cm<sup>–1sup>) after excitation in the blue spectral region. Ce<sup>3+sup>-doped samples show luminescence in the green spectral range (λ<sub>emsub> = 540 nm). The compounds were synthesized via solid-state metathesis reaction in Li melts. Refinement of single-crystal X-ray diffraction data revealed that Li<sub>2sub>(Ca<sub>1.88sub>Sr<sub>0.12sub>)[Mg<sub>2sub>Si<sub>2sub>N<sub>6sub>] crystallizes isomorphic to Li<sub>2sub>Ca<sub>2sub>[Mg<sub>2sub>Si<sub>2sub>N<sub>6sub>]: C2/m [Z = 2, a = 5.5744(2), b = 9.8439(3), c = 6.0170(2) Å, β = 97.2520(10)°, R<sub>1sub> = 0.021, wR<sub>2sub> = 0.047]. Crystal composition was checked by EDS and ICP-OES measurements and luminescence properties are compared to state of the art narrow-band red emitting luminophors. On the basis of its narrow-band emission, application of the novel red luminophor in high CRI white pcLEDs is promising.