The solid-state method first prepared a series of Ca3TeO6:Tm3+ blue-emitting phosphors. The X-ray powder diffraction were used to analyze the phase formations and purity of Ca3TeO6:xTm3+, xNa+ (0.002 ≤ x ≤ 0.10). The detection wavelength (λem = 454 nm) and a excitation wavenlenth (λex = 359 nm) were used to study photoluminescence spectra. After the comparison of different concentration phosphors, the optimal doping one was found as 0.05. Electric multipole interaction was proposed as the mechanism for concentration quenching in Ca3TeO6 materials. Furthermore, the Ca3TeO6:0.05Tm3+ fluoresces blue with color coordinates (0.161, 0.0671). Based on these results, Ca3TeO6:Tm3+ phosphors could be promising blue-emitting materials for the white light-emitting diodes (w-LED) applications.
Tm3+ doped NaCa3Bi(PO4)3F blue-emitting phosphors have been synthesized following a conventional high-temperature solid-state reaction. Their phase purity, optical characteristics were systematically studied. The results show that the optimal doping concentration of Tm3+was 0.05. Electric multipole interaction was proposed as the mechanism for concentration quenching in NaCa3Bi(PO4)3F materials. Furthermore, the NaCa3Bi(PO4)3F:0.05Tm3+ fluoresces blue with color coordinates (0.1592, 0.0346). The results indicated that NaCa3Bi(PO4)3F:Tm3+ phosphors could participate in fabricating the w-LEDs as the blue component.
Recently, rare-earth doped phosphors have been newly developed and applied in phosphor-converted light-emitting diodes (pc-LEDs). A Tm3+-activated tungstate Ca3La2W2O12 blue-emitting phosphor was synthesized by a high-temperature solid-state reaction. The phase purity, crystallinity, and surface morphology of the Ca3La2W2O12: xTm3+ (x = 0.2%-15% mol) phosphors were characterized by X-ray powder diffraction. Under 358 nm excitation, the phosphor can exhibit narrow blue-light emission at 460 nm due to the transition 1G4 →3 H6 of Tm3+. The critical energy transfer distance and optimal doping concentration of Tm3+ ions are 16.92 Å and 0.10 mol, respectively. The Commission International del’Eclairage (CIE) chromaticity coordinates of Ca3La2W2O12:0.10Tm3+ are (0.1447, 0.0492) with a high color purity 95.8%. The results suggested Ca3La2W2O12:Tm3+ phosphors can be promising blue-emitting components for LED applications.
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