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K7Ca9[Si2O7]4F:Ce3+: A Novel Blue-Emitting Phosphor with Good Thermal Stability for Ultraviolet-Excited Light Emitting Diode

Abstract

In this work, a novel potassium-calcium silicate-fluoride based phosphor: K7Ca9[Si2O7]4F (KCSOF) has been successfully synthesized by the solid-state reaction at low temperature. The occupation of Ce3+ is studied by Rietveld refinement, luminescence properties and decay curves. KCSOF: Ce3+ presents a wide absorption band ranging from 240 to 420 nm and performs blue emission (λmax = 445 nm). The good thermal stability has also been detected, which shows that it still keeps 90% of the initial intensity at 200 oC. In addition, a white LED device has been manufactured by connecting a 380 nm UV chip with a blend of KCSOF: Ce3+, (Sr,Ba)SiO4: Eu2+ and CaAlSiN3: Eu2+. The color coordinate, correlated color temperature and color rendering index of the manufactured LED device are (0.421, 0.407), 3256 K and 95.55, respectively. These results suggest that the blue-emitting KCSOF: Ce3+ phosphor has the prospect of becoming applications in white UV LEDs.

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Publication details

The article was received on 09 Jun 2017, accepted on 10 Oct 2017 and first published on 11 Oct 2017


Article type: Paper
DOI: 10.1039/C7TC02561K
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    K7Ca9[Si2O7]4F:Ce3+: A Novel Blue-Emitting Phosphor with Good Thermal Stability for Ultraviolet-Excited Light Emitting Diode

    W. Geng, X. Zhou, J. Ding, G. Li and Y. Wang, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC02561K

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