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Y2Si4N6C:Ce3+ Carbidonitride Green-Yellow Phosphors:Novel Synthesis, Photoluminescence Properties, and Applications

Abstract

The Y2Si4N6C:Ce3+ carbidonitride phosphor has been successfully synthesized via a novel acid–driven carbonization & carbothermal reduction nitridation method (ADC-CRN). This novel approach for Y2Si4N6C:Ce3+ promises lower heating temperature and shorter heating time than classic methods, indicating of a cost-effective and facile way to search for new silicon-based carbidonitrides. In contrast to Ce3+ activated (oxy)nitrides almost showing blue-green emisisons, Y2Si4N6C:Ce3+ exhibits an individual green-yellowish emission band centered at 550 nm which is ascribed to the incorporation of high covalent C4- into the host lattice. The sp3 hybrid C4- was identified through high resolution electron energy loss spectroscopy analysis (EELS). A direct evidence of Ce3+ sole substitution for Y3+ in Y2Si4N6C is first represented with electron paramagnetic resonance (EPR) spectra. The red shift induced by increasing Ce3+ content in Y2Si4N6C is reasonably deduced by the energy transfer model of intra-Ce3+ and inter-Ce3+ ions. A pc-w-LED packaging was fabricated by combining the prepared yellow Y2Si4N6C:Ce3+ and blue La2Si4N6C:Ce3+ phosphors with a 365 nm n-UV chip. The w-LED device shows good color rendering index (Ra), CIE chromaticity coordinates and correlated color temperature (CCT) of 83.8, (0.3258, 0.3314) and 5819 K, respectively. These results suggest that Y2Si4N6C:Ce3+ has great potentials for use in UV-LED-driven white emitting diodes.

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Publication details

The article was received on 09 Mar 2017, accepted on 23 Apr 2017 and first published on 24 Apr 2017


Article type: Paper
DOI: 10.1039/C7TC01010A
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Y2Si4N6C:Ce3+ Carbidonitride Green-Yellow Phosphors:Novel Synthesis, Photoluminescence Properties, and Applications

    J. Wan, Q. Liu, G. Liu, Z. zhou and R. Xie, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01010A

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