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

Описание

Тип публикации: статья из журнала

Год издания: 2019

Идентификатор DOI: 10.1039/c9tc05354a

Аннотация: 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 intenПоказать полностьюsity/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. © 2019 The Royal Society of Chemistry.

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Издание

Журнал: Journal of Materials Chemistry C

Выпуск журнала: Vol. 7, Is. 46

Номера страниц: 14594-14600

ISSN журнала: 20507534

Издатель: Royal Society of Chemistry

Персоны

  • Hu T. (State Key Laboratory of Luminescent Materials and Devices, Institute of Optical Communication Materials, South China University of Technology, Guangzhou, 510641, China)
  • Molokeev M.S. (Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation, Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation)
  • Xia Z. (State Key Laboratory of Luminescent Materials and Devices, Institute of Optical Communication Materials, South China University of Technology, Guangzhou, 510641, China)
  • Zhang Q. (State Key Laboratory of Luminescent Materials and Devices, Institute of Optical Communication Materials, South China University of Technology, Guangzhou, 510641, China)

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