A novel efficient red-emitting KSrYBO: Eu phosphor with non-concentration quenching and robust thermal stability for white LEDs.

Inhibiting energy migration between Eu ions in a fixed host to get higher doping concentration is a permanent topic. Herein, a novel non-concentration quenching red-emitting KSrYBO: xEu (0.1 ≤ x ≤ 1.0) phosphor was synthesized via high-temperature sintering method. XRD measurement, Rietveld refinement results, and radius percentage deviation calculation demonstrated the phase purity and the occupation preference of Eu ions. With continuously increasing doping Eu ions, the absence of concentration quenching could be explained by long distance between two Eu (7.012 Å) and the KSrEuBO could exhibit striking photoluminescence performance with the highest emission wavelength centered at 617 nm. Meanwhile, under the radiation of 393 nm, the high internal quantum efficiency ( ∼ 78.71 %), excellent color purity ( ∼ 88.32 %) and robust thermal stability whose emission intensity at 140 °C could still reach ∼ 97.31 % could guarantee its potential application. When coating BaMgAlO: Eu, (Ba, Sr)SiO: Eu, and KSrEuBO on a near-ultraviolet chip, the bright white light with a low correlated color temperature of 4211 K and CIE color coordinates of (0.3675, 0.3556) could be obtained. Taking the analytic results above, the non-concentration quenching KSrYBO: Eu compound has great potential to act as a candidate for red-emitting phosphors in solid-state lighting field.