Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 741, Issue -, Pages 300-306Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.12.316
Keywords
Rare-earth ions; White LEDs; Luminescence; Eu3+; Red phosphors
Categories
Funding
- National Natural Science Foundation of China [51502190]
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
- Start-up Research Grant of Taiyuan University of Technology [Tyutrc201489a]
- Excellent Young Scholars Research Grant of Taiyuan University of Technology [2014YQ009, 2015YQ006, 2016YQ03]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2017-skllmd-01]
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A series of novel Na3Sc2(PO4)(3):Eu3+ phosphors with different Eu3+ doping concentrations were synthesized by conventional solid-state method and their crystal structure, morphology, luminescence properties, temperature-dependent emission spectra, decay curves and quantum efficiency were investigated in detail. Under near-ultraviolet excitation at 394 nm, all samples exhibited strong red emissions peaking at 593, 621, 654, and 699 nm, corresponding to the characteristic D-5(0)-> F-7(1,2,3,4) transitions of Eu3+ ions. From the concentration-dependent photoluminescence studies of Na3Sc2(PO4)(3):Eu3+ phosphors, the optimal doping concentration of Eu3+ ions was found to be 35 mol% and the concentration quenching mechanism was dominated by dipole-dipole interactions. More importantly, the emission intensity of Na3Sc2(PO4)(3) phosphors was about 6.17 times stronger than that of commercial red phosphor Y2O2S:Eu3+. Furthermore, the prepared Na3Sc2(PO4)(3):0.35Eu(3+) sample also possessed good colour coordinates of (0.642, 0.353) and its internal quantum efficiency was measured to be 49%. The temperature-dependent emission spectra suggested that the resultant products possessed excellent thermal stability, and the activation energy was determined to be 0.23 eV. These good results indicate that the Na3Sc2(PO4)(3):Eu3+ phosphors are very appropriate red-emitting phosphors for applications in near-ultraviolet-excited white light-emitting diodes. (C) 2018 Elsevier B.V. All rights reserved.
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