Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 46, Pages 14594-14600Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc05354a
Keywords
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Funding
- National Natural Science Foundation of China [51722202, 51972118]
- Guangdong Provincial Science & Technology Project [2018A050506004]
- Fundamental Research Funds for the Central Universities [D2190980]
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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 similar to 512 nm) to yellow (peaking at similar to 552 nm), and zero thermal quenching, even up to 200 degrees C. The Be2+ substitution at the Al-2/Si-2 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.
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