Abstract
A new blue phosphor KBa2−xTm x P5O15 for white light-emitting diodes (W-LEDs) was prepared by the high-temperature solid-state synthesis method. Its structure, morphology, elementary composition, and luminescent properties were investigated. The phosphor KBa1.96Tm0.04P5O15 exhibits an irregular morphology with a diameter of about 10 μm. The emission spectra consisted of two emission peaks centered at 451 and 477 nm due to the 1D2 → 3F4 and 1G4 → 3H6 transitions of Tm3+ activator, respectively. The optimum dopant concentration of Tm3+ activator in KBa2P5O15 host matrix is about 4 mol%. The critical distance is calculated to be 25 A, and the concentration quenching mechanism of Tm3+ ions in KBa2P5O15 was confirmed to be d–q interaction. The CIE coordinates of KBa1.96Tm0.04P5O15 phosphor was calculated to be (0.1503, 0.0542), corresponding to blue color with a high color purity of about 92%. Hence, we may expect that the obtained phosphor KBa2−xTm x P5O15 would be potentially used as a blue phosphor for W-LEDs.
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