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Controllable optical tuning and improvement in Li+, Eu3+-codoped BaSc2O4:Bi3+ based on energy transfer and charge compensation

Abstract

In pursuit of highly efficient phosphors for white LEDs (w-LEDs) lighting, chemical modification of host lattice and design of energy transfer in a variety of cation sites have been extensively concerned. In this work, a series of novel Bi3+, Li+, Eu3+-doped BaSc2O4 phosphors with blue-to-red tunable emission were synthesized by high-temperature solid-state reaction process. Charge compensators (Li+) and fluxes (BaF2) were jointly employed to improve the phase purity and luminescence properties of phosphors based on appropriate chemical modifications. The crystal structures were analyzed by the XRD and Rietveld refinement, and the photoluminescence properties and thermal stabilities of the studied phosphors were investigated in detail. For BaSc2O4:Bi3+, it could be efficiently excited by n-UV light (250-350 nm), and exhibit a bright broad blue emission band (400-520 nm) with a peak at 440 nm. Moreover, the introduction of Li+ ion and BaF2 could efficiently enhance emission intensity and decrease thermal quenching, which should be due to the lattice modification. Interestingly, systematic luminescence tuning from blue to red could be achieved by designing Bi3+→Eu3+ energy transfer. The corresponding luminescence mechanism was discussed and proposed. In addition, Bi3+,Li+-doped BaSc2O4 phosphors with BaF2 demonstrate good thermal stability, whose emission intensity at 150 °C still exceed 70% of the initial RT value. The above results indicate that the BaSc2O4:Bi3+, Li+ phosphor would be a potential blue phosphor for n-UV based w-LEDs devices. Moreover, the controllable emission adjustment from Bi3+, Eu3+-codoped BaSc2O4 phosphors could derivate a series of novel phosphor materials for improving the light quality of w-LEDs source.

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Publication details

The article was received on 28 Mar 2018, accepted on 11 May 2018 and first published on 12 May 2018


Article type: Paper
DOI: 10.1039/C8TC01463A
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Controllable optical tuning and improvement in Li+, Eu3+-codoped BaSc2O4:Bi3+ based on energy transfer and charge compensation

    P. Dang, S. Liang, G. Li, Y. Wei, Z. Cheng, H. Lian, M. Shang, S. J. Ho and J. Lin, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC01463A

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