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Efficient and controllable photoluminescence in novel solid solution phosphors Ca1-xSrxHf4(PO4)6:Eu2+ with high thermal stability for white light emitting diodes

Abstract

To explore a new family of phosphate phosphors for application in ultraviolet-based light emitting diodes (LEDs), a novel promising blue emission solid solution phosphor Ca1-xSrxHf4(PO4)6:Eu2+ with efficient and controllable photoluminescence were synthesized and identified in the full range of 0≤x≤1. To deep understand the relationship between the structure and the properties of phosphors, the phase purity, crystal structure and the linear structural evolution of Ca1-xSrxHf4(PO4)6:Eu2+ solid-solutions were investigated in detail by FT-IR spectrum, power XRD patterns of Rietveld structure refinement and verified by high transmission electron microscopy (HRTEM). The linear structural evolution induced controllable blue emission with high quantum efficiency and excellent thermal stability can be obtained in the Ca1-xSrxHf4(PO4)6:Eu2+ solid-solution phosphors. Moreover, the photoluminescence property in the Ca1-xSrxHf4(PO4)6:Eu2+ can be optimized through adjusting the components. The mechanism of the controllable luminescence property is also investigated in detail. The excellent thermal stability is obtained in Ca1-xSrxHf4(PO4)6:Eu2+ and the thermal quenching mechanism is investigated. Finally, white LEDs are fabricated and the electroluminescence properties are investigated. Such a simple and effective method to optimize the photoluminescence property of phosphors can be used for designing other novel solid-solution phosphors.

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Supplementary files

Publication details

The article was received on 31 May 2018, accepted on 04 Jul 2018 and first published on 04 Jul 2018


Article type: Paper
DOI: 10.1039/C8CE00898A
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Efficient and controllable photoluminescence in novel solid solution phosphors Ca1-xSrxHf4(PO4)6:Eu2+ with high thermal stability for white light emitting diodes

    S. Xin, M. Gao, C. Wang, X. Wang, G. Zhu, F. Zhou, Z. Li and Y. Wang, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00898A

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