Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 11, Pages 13832-13837Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.04.080
Keywords
Vanadate phosphor; Self-activated luminescence; UV-LED; Energy transfer; Excitation and emission spectra; Multicolor luminescent
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Funding
- National Natural Science Foundation of China of China [51702147]
- Youth project of Fujian education department (science and technology) [JAT170565]
- Scientific Start Foundation of Longyan University [LB2016001]
- Open Project Program of Provincial Key Laboratory of Clean Energy Materials, Longyan University [QJNY-201702]
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In this study, Eu3+-doped LiCa2Mg2V3O12 (LCMVO) phosphors with multicolor luminescent property were prepared by the solid phase reaction. Their structure, morphology and luminescent property were studied systematically by X-ray diffraction, scanning electron microscope and photoluminescence spectra. The LCMVO phosphors showed pure cubic crystal structure with space group (Ia (3) over bard) and irregular spherical morphology. The excitation spectra showed a strong absorption to ultraviolet light. Under the excitation wavelength at 360 nm, they exhibited a cyan emission with a luminescence center at 520 nm. When Eu3+ ions were doped into LCMVO system, the Eu3+ characteristic emissions were also observed and the emission colors were tuned from cyan to orange via adjusting Eu3+ ion concentration. Further, electric dipole-quadrupole interaction and luminescence decay curves were adopted to explain the energy transfer from (VO4)(3-) to Eu3+. The emission spectra of as-obtained phosphors at different temperature were measured to evaluate their thermal stability. The quantum efficiency values were measured to be 42.5% for LCMVO host and 38.6% for LCMVO: 0.01Eu(3+) sample. The final prepared LED lamp showed easeful warm white light with suitable Ra of 89 and CCT of 3847 K, respectively. These results suggest LCMVO phosphors may be applied in near ultraviolet chip-excited white light-emitting diodes.
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