A single-phase full-color emitting phosphor Na3Sc2(PO4)(3):Eu2+/Tb3+/Mn2+ with near-zero thermal quenching and high quantum yield for near-UV converted warm w-LEDs

A single-phase full-color emitting phosphor Na3Sc2(PO4)(3):Eu2+/Tb3+/Mn2+ has been synthesized by high-temperature solid-state method. The crystal structure is measured by X-ray diffraction. The emission can be tuned from blue to green/red/white through reasonable adjustment of doping ratio among Eu2+/Tb3+/Mn2+ ions. The photoluminescence, energy-transfer efficiency and concentration quenching mechanisms in Eu2+-Tb3+/Eu2+-Mn2+ co-doped samples were studied in detail. All as-obtained samples show high quantum yield and robust resistance to thermal quenching at evaluated temperature from 30 to 200 degrees C. Notably, the wide-gamut emission covering the full visible range of Na3Sc2(PO4)(3):Eu2+/Tb3+/Mn2+ gives an outstanding thermal quenching behavior near-zero thermal quenching at 150 degrees C/less than 20% emission intensity loss at 200 degrees C, and high quantum yield-66.0% at 150 degrees C/56.9% at 200 degrees C. Moreover, the chromaticity coordinates of Na3Sc2(PO4)(3):Eu2+/Tb3+/Mn2+ keep stable through the whole evaluated temperature range. Finally, near-UV w-LED devices were fabricated, the white LED device (CCT = 4740.4 K, Ra = 80.9) indicates that Na3Sc2(PO4)(3):Eu2+/Tb3+/Mn2+ may be a promising candidate for phosphor-converted near-UV w-LEDs.