Synthesis and Luminescence Properties of Amber Emitting La7Sr[Si10N19O3] : Eu2+ and Syntheses of the Substitutional Variants RE(8-x)AE(x)[Si10N20-xO2+x] : Eu2+ with RE=La, Ce;AE=Ca, Sr, Ba;0 <= x <= 2

Gamperl, Lisa; Strobel, Philipp; Schmidt, Peter J. and Schnick, Wolfgang (2022): Synthesis and Luminescence Properties of Amber Emitting La7Sr[Si10N19O3] : Eu2+ and Syntheses of the Substitutional Variants RE(8-x)AE(x)[Si10N20-xO2+x] : Eu2+ with RE=La, Ce;AE=Ca, Sr, Ba;0 <= x <= 2. In: Chemistry - A European Journal, Vol. 28, No. 36

Abstract

The oxonitridosilicate La7Sr[Si10N19O3] : Eu2+ and its substitutional variants RE(8-x)AE(x)[Si10N20-xO2+x] : Eu2+ with RE=La, Ce;AE=Ca, Sr, Ba and 0 <= x <= 2 were synthesized starting from REN, SrN/Ca3N2/Ba2N, SiO2, amorphous Si3N4 and Eu2O3 as doping agent at 1600 degrees C in a radiofrequency furnace. The crystal structure of La7Sr[Si10N19O3] was solved and refined based on single-crystal X-ray diffraction data. La7Sr[Si10N19O3] crystallizes in the orthorhombic space group Pmn2(1) (no. 31). The crystal structures of the isotypic compounds RE(8-x)AE(x)[Si10N20-xO2+x] were confirmed by Rietveld refinements based on powder X-ray diffraction data using the single-crystal data of La7Sr[Si10N19O3] as starting point. Crystal structure elucidation reveals a 3D network of vertex sharing SiN4 and SiN2(N1/2-x/4O1/2+x/4)(2) (0 <= x <= 2) tetrahedra. When excited with UV to blue light, La7Sr[Si10N19O3] : Eu2+ shows amber luminescence with lambda(em)=612 nm and fwhm=84 nm/2194 cm(-1), which makes it interesting for application in amber phosphor-converted light emitting diodes.

• Item Type: Journal article
• Faculties: Chemistry and Pharmacy > Department of Chemistry
• Subjects: 500 Science > 540 Chemistry
• ISSN: 0947-6539
• Language: English
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 491502892