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Aliovalent substitution toward reinforced structural rigidity in Ce3+-doped garnet phosphors featuring improved performance

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Abstract

Highly efficient phosphors with thermal stability and color-tunable emission are required for the fabrication of phosphor-converted white light-emitting diodes (pc-WLEDs). Currently developed engineering strategies are generally successful in photoluminescence tuning but, unfortunately, suffer severe deterioration in emission intensity/efficiency and/or thermal stability. Herein, an efficient aliovalent substitution strategy toward reinforced structural rigidity is proposed and demonstrated experimentally. By incorporating Be2+ ion into the garnet-type Lu2SrAl4SiO12:Ce3+ phosphor, the phosphor shows enhanced internal/external quantum efficiency, from 79.2%/26.7% to 84.5%/32.9%, photoluminescence tuning from green (peaking at ∼512 nm) to yellow (peaking at ∼552 nm), and zero thermal quenching, even up to 200 °C. The Be2+ substitution at the Al2/Si2 site enables stable and rigid local surroundings around the Ce3+ activator, which is responsible for the unprecedented performance. In addition, high-quality warm WLED devices with a luminous efficiency of 158.1 lm W−1, correlated color temperature of 3858 K and high color rendering index of 81.7, are obtained by combining Lu2SrAl4SiO12:Ce3+,Be2+ as the yellow emitter, CaAlSiN3:Eu2+ as the red emitter and a blue-emitting InGaN chip. These findings highlight a new strategy for performance optimization of LED phosphors by selecting rigid covalent compounds with further reinforced structural rigidity via aliovalent substitution.

Graphical abstract: Aliovalent substitution toward reinforced structural rigidity in Ce3+-doped garnet phosphors featuring improved performance

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Publication details

The article was received on 29 Sep 2019, accepted on 28 Oct 2019 and first published on 29 Oct 2019


Article type: Paper
DOI: 10.1039/C9TC05354A
J. Mater. Chem. C, 2019, Advance Article

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    Aliovalent substitution toward reinforced structural rigidity in Ce3+-doped garnet phosphors featuring improved performance

    T. Hu, M. S. Molokeev, Z. Xia and Q. Zhang, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C9TC05354A

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