Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 45, Pages 12159-12163Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc04101f
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Funding
- National Key R&D Program of China [2016YFB0400605, 2016YFB0701003, 2017YFB0403104]
- National Natural Science Foundation of China [11874055, 51772286, 11604330]
- Natural Science Foundation of Jilin Province [20160520171JH]
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Traditional phosphor-converted white LEDs suffer from the so-called blue-green cavity in their emission spectra. Hence, satisfactory phosphors with sufficient emission around 490 nm are still lacking. Herein, we report a newly designed garnet-type phosphor, Lu2SrAl4SiO12:Ce3+ (LSAS:Ce3+), through chemical unit cosubstitution, whose emission can well fill the blue-green cavity. Importantly, LSAS:Ce3+ exhibits nearly zero thermal quenching even at 473 K (200 degrees C) as well as a high internal quantum efficiency of 93.3%. Finally, the as-fabricated warm white LED device shows a high color rendering index of 97.6 with R9 = 94, indicating its great potential for white LEDs.
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