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Issue 44, 2017
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K7Ca9[Si2O7]4F:Ce3+: a novel blue-emitting phosphor with good thermal stability for ultraviolet-excited light emitting diodes

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Abstract

In this work, a novel potassium-calcium silicate-fluoride based phosphor: K7Ca9[Si2O7]4F (KCSOF) has been successfully synthesized by a 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 displays blue emission (λmax = 445 nm). Good thermal stability has also been detected, which shows that it still retains 90% of the initial intensity at 200 °C. 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 coordinates, 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 good prospects for applications in white UV LEDs.

Graphical abstract: K7Ca9[Si2O7]4F:Ce3+: a novel blue-emitting phosphor with good thermal stability for ultraviolet-excited light emitting diodes

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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, 2017,5, 11605-11613
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    K7Ca9[Si2O7]4F:Ce3+: a novel blue-emitting phosphor with good thermal stability for ultraviolet-excited light emitting diodes

    W. Geng, X. Zhou, J. Ding, G. Li and Y. Wang, J. Mater. Chem. C, 2017, 5, 11605
    DOI: 10.1039/C7TC02561K

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