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8528550 
Journal Article 
Synthesis, crystal structure and luminescence properties of a Y4Si2O7N2:Ce3+ phosphor for near-UV white LEDs 
Wu, Q; Yang, Z; Zhao, Z; Que, M; Wang, X; Wang, Y; , 
2014 
Journal of Materials Chemistry C
ISSN: 2050-7526
EISSN: 2050-7534 
ROYAL SOC CHEMISTRY 
CAMBRIDGE 
4967-4973 
WOS:000337129700009 
A near-UV excited phosphor, Y4Si2O7N2: Ce3+, was synthesized using a solid-state reaction. The crystal structure and luminescence properties were studied. Y4Si2O7N2 crystallizes in a monoclinic unit cell with space group P2(1)/c, lattice constants a = 7.5678(2) angstrom, b = 10.4529(1) angstrom, c = 10.7779(3) angstrom and beta = 110.06 degrees, and cell volume = 800.85(2) angstrom(3). The crystal structure of Y4Si2O7N2, featuring Si(O,N) 4 polyhedra, is provided, and there are four different Y3+ coordination environments with two different coordination numbers in the structure. Ce3+-doped Y4Si2O7N2 exhibited a broad emission band, and the maximum emission wavelength could be tuned from blue (lambda(em) = 450 nm) to green (lambda(em) = 515 nm) by increasing the concentration of Ce3+. The quantum efficiency was determined to be about 47%. The results show that Y4Si2O7N2:Ce3+ is a candidate for use as a conversion phosphor for near-UV white LED applications.