Journal
CHEMISTRY OF MATERIALS
Volume 30, Issue 15, Pages 5137-5147Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.8b01652
Keywords
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Funding
- National Natural Science Foundation of China [21505038, 51402105, 21601081, 21471055]
- National Key Research and Development Program [2016YFB0302403]
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Ba1.8-xSrxSiO4:0.1Ce(3+),0.1Na(+) (x = 0-1.8) phosphors were prepared by a high-temperature solid-state reaction. The emission peaks of Ba1.8-xSrxSiO4:0.1Ce(3+),0.1Na(+) shift from 391 to 411 nm with increasing Sr2+ content under excitation by a UV light at around 360 nm. Ba0.4Sr1.4SiO4:0.1Ce(3+),0.1Na(+) phosphor exhibits the best performance of luminescence, whose absolute quantum efficiency is 97.2%, and the emission intensity at 150 degrees C remains 90% of that at room temperature. The effect of replacing Ba2+ by Sr2+ on the red shift of the emission band and the increase of quantum efficiency (QE) and thermal stability (TS) was investigated in detail based on the Rietveld refinements, Raman spectra, thermoluminescence, and decay curves, etc. The performance of UV chip-based pc-LEDs indicates that Ba0.4Sr1.4SiO4:0.1Ce(3+),0.1Na(+) can be a promising blue phosphor for white-emitting pc-LEDs.
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