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Issue 42, 2014
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CaY2Si2S8:Ce3+: a novel green-emitting thiosilicate phosphor for white light-emitting diodes

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Abstract

A novel green-emitting Ce3+-doped CaY2Si2S8 thiosilicate phosphor was synthesized by using solid-state methods in a sealed silica ampoule. This compound could be excited over a broad range from UV to blue light (400–450 nm) and generated a broadband emission peaking at ∼495 nm, with a quantum efficiency of ∼57%, which is promising for solid-state lighting applications. Temperature-dependent optical measurements of CaY2Si2S8:Ce3+ from 25 to 225 °C were performed. In addition, a white LED device was fabricated by using the green-emitting CaY2Si2S8:Ce3+ phosphor and commercially-available red-emitting CaAlSiN3:Eu2+ pumped with a 450 nm blue chip. The CRI value and CCT were measured to be 91–95 and 3800–8600 K, respectively, showing promising potential for solid-state lighting applications. The preparation, spectroscopic characterization, quantum efficiency, decay lifetime, thermal stability, and related LED device data are also presented.

Graphical abstract: CaY2Si2S8:Ce3+: a novel green-emitting thiosilicate phosphor for white light-emitting diodes

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Publication details

The article was received on 18 Jul 2014, accepted on 30 Aug 2014 and first published on 03 Sep 2014


Article type: Paper
DOI: 10.1039/C4TC01572J
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J. Mater. Chem. C, 2014,2, 8925-8931

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    CaY2Si2S8:Ce3+: a novel green-emitting thiosilicate phosphor for white light-emitting diodes

    S. Lee, C. Huang and T. Chen, J. Mater. Chem. C, 2014, 2, 8925
    DOI: 10.1039/C4TC01572J

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