Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 892, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162066
Keywords
Blue phosphor; K2SrBa(PO4)(2); Quantum efficiency; Thermal quenching; White LEDs
Categories
Funding
- Royal Society of New Zealand through a Marsden Fast-Start Fund [UOA1623]
- Jiangsu Specially-Appointed Professorship Foundation, China
- China Scholarships Council (CSC)
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The phosphor reported in this study exhibits ultra-narrow emission band, high quantum efficiency, and excellent thermal stability, making it suitable for high-power lighting and backlight display applications.
The design of phosphors simultaneously having excellent quantum efficiency, ultra-narrow emission band and zero thermal quenching is yet a big challenge. Herein, we report a blue-emitting K2SrBa(PO4)(2):xEu(2+) phosphor with ultra-narrow emission peaked at 425 nm with a full width at half maximum (FWHM) of 37 nm (2088 cm-1), high color purity (0.93), together with superior thermal stability and quantum effi-ciency. This phosphor displays an external quantum efficiency (EQE) of 75.3%, exceeding those of blue phosphors reported thus far. It also has excellent thermal stability showing near zero thermal quenching up to 300 degrees C, retaining 102%, 100% and 96% of its initial integrated emission intensity at 75, 200 and 300 degrees C, respectively. Rietveld refinements and density functional theory (DFT) calculations reveal that the Eu2+ ions preferentially occupy the Sr/Ba sites, rather than the K sites, of the host structure, contributing to the superior photoluminescence properties. The as-developed phosphors can be potentially applied in the phosphor-converted white light emitting diodes (pc-WLEDs) for applications such as high-power lighting and backlight display. (C) 2021 Elsevier B.V. All rights reserved.
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