Abstract
Novel Ba3Y2-xEuxB6O15 (0.1 ≤ x ≤ 1.0) orange-red emitting phosphors were synthesized by conventional high-temperature solid-state reaction method. The phase purity, crystal structure, morphology, photoluminescence properties, energy transfer mechanism between Eu3+ ions and lifetime were investigated in detail. The as-synthesized Ba3Y2-xEuxB6O15 phosphors can be efficiently excited by near-ultraviolet (near-UV) at 393 nm and exhibited an excellent orange-red emission centered at 593 nm corresponding to the 5D0→7F1 transition of Eu3+ ions. The result of Eu3+ concentration on the PL intensity of Ba3Y2-xEuxB6O15 phosphors was investigated and the optimum concentration was obtained to be x = 0.7. The critical distance of Eu3+ ions was obtained to be 9.98 Å and the non-radiative energy transfer among the Eu3+ ions was dominated by the dipole-dipole interaction. The Commission International de I'Eclairage (CIE) chromaticity coordinates of Ba3Y1.3Eu0.7B6O15 were (x = 0.601, y = 0.396). According to the temperature dependent emission spectra, the better thermal stability of Ba3Y1.3Eu0.7B6O15 phosphor was also determined. All the results suggested that the examined Ba3Y2-xEuxB6O15 could be potential orange-red phosphors for white light emitting diodes.
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