Abstract
A series of emission-tunable Ba3-xSc(BO3)3: xEu2+ (0 ≤ x ≤ 0.15) and Ba2.97-yGdySc1-yMgy(BO3)3: 0.03Eu2+ (0 ≤ y ≤ 0.15) phosphors were synthesized by a solid-state method. Structure analysis of X-ray powder diffraction (XRD) and Rietveld refinement show that Eu2+ ions occupy randomly at Ba sites of hexagonal lattice with space group P63cm. Photoluminescence emission spectra and the decay curves of phosphors demonstrated the existence of multiple Eu2+ emitting centers. Eu2+ ions occupy at four Ba sites of Ba3-xSc(BO3)3: xEu2+ (0.03 ≤ x ≤ 0.15) emit orange light (λem = 670 nm and 560 nm) through 370 nm UV excitation. The broader absorption band, ranging from 220 nm to 550 nm, matches well with the near-ultraviolet LED chips. Furthermore, color tuning from orange to red is successfully achieve by the double doping of Gd3+-Ba2+ and Mg2+-Sc3+ in Ba2.97Sc(BO3)3: 0.03Eu2+. Our results indicate that red emission Ba3Sc(BO3)3: Eu2+ phosphors is an ideal candidate for the application in white light-emitting diodes.
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