首页|Ultra-narrow-band blue-emitting K2SrBa(PO4)2:Eu2+ phosphor with superior efficiency and thermal stability
Ultra-narrow-band blue-emitting K2SrBa(PO4)2:Eu2+ phosphor with superior efficiency and thermal stability
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NSTL
Elsevier
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:xEu2+ 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 efficiency. 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 °C, retaining 102%, 100% and 96% of its initial integrated emission intensity at 75, 200 and 300 °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.
Blue phosphorK2SrBa(PO4)2Quantum efficiencyThermal quenchingWhite LEDs
Cao P.、Gu Q.、Ma Z.、Huang S.、Zhao K.、Yin L.、Yang T.、Zhang T.
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Department of Chemical and Materials Engineering The University of Auckland
Australian Synchrotron ANSTO
School of Materials Science and Engineering Jiangsu University of Science and Technology
NSTL
Elsevier
