4.6 Article Proceedings Paper

Soft chemical synthesis and luminescent properties of Na3Al2Li3F12:Mn4+ garnet-type nanophosphor

Journal

OPTICAL MATERIALS
Volume 89, Issue -, Pages 340-343

Publisher

ELSEVIER
DOI: 10.1016/j.optmat.2019.01.039

Keywords

Nanophosphors; Time resolved photoluminescence; Cathodoluminescence; Mn4+ red luminescence; Fluoride garnets; Warm white LEDs

Funding

  1. TK141 Advanced materials and high-technology devices for sustainable energetics, sensorics and nanoelectronics
  2. Russian Foundation for Basic Research [16-52-76028 ERA_a]
  3. Estonian Research Council [PRG111]
  4. Estonian Ministry of Education and Research [IUT2-24, IUT2-26]
  5. ERA.Net RUS Plus Programme Project NANOLED Advanced nanophosphors for white light generation with light emitting diodes [361]

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For the first time we report the synthesis of nanocrystalline powders of Na3Al2Li3F12 phase, both pure and doped with Mn4+ using slow room temperature co-precipitation in methanol-water mixtures. Optical properties of obtained highly crystalline nanoparticles with the size in the range of 40-80 nm are studied. The synthesized Mn4+ doped fluoride garnet nanophosphors show typical Mn4+ luminescence spectrum in the red region (620-630 nm) under both photo- and 10 keV electron excitation, which is optimal emission wavelength for red phosphors in warm white LEDs. The relaxation dynamics of Mn4+ luminescence in this host has a complicated nature. Under the intra-centre excitation of Mn4+ ions and charge-transfer band excitation the decay is non exponential in the studied temperature range, which indicates that there exists some additional mechanism of quenching, which is not related to intrinsic thermal quenching of Mn4+ luminescence.

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