☆ 4.8 Article

Novel high-saturated red-emitting phosphor Sr9(Mg0.5Mn0.5)K(PO4)7: Eu2+with great quantum efficiency enhancement by La3+ codoping for white LED application

MATERIALS TODAY CHEMISTRY (2023)

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Summary: The urgent need for efficient and high-purity red phosphors in LED development was addressed in this study. The whitlockite compound Ca19Mn2(PO4)(14) with its compact and compositional-tunable structure was chosen as the phosphor host for Eu2+ sensitization. Various analyses were conducted to investigate the properties of Ca19Mn2(PO4)(14): Eu2+, including Rietveld refinement, steady-state spectra, decay lifetime analysis, and temperature-dependent emission spectra. The results showed that Ca19Mn2(PO4)(14): Eu2+ exhibited strong Mn2+ sensitized emission under 360 nm excitation, with excellent emission engineering achieved through Sr2+ co-doping. The phosphor also demonstrated promising thermal stability. Overall, this study highlights the great potential of Ca19Mn2(PO4)(14): Eu2+ phosphor as an efficient red phosphor for phosphor-converted white LEDs.

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