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A series of novel blue long-lasting phosphorescence phosphors Sr6Al18Si2O37:Eu2+,RE3+(RE3+=Ho3+, Gd3+, Dy3+ and Pr3+) were prepared by the conventional high-temperature solid-state reaction in a reductive atmosphere. Their properties were systematically investigated utilizing X-ray diffraction(XRD), photoluminescence, phosphorescence and thermoluminescence(TL) spectra. The phosphors emitted blue light that was related to the emission of Eu2+ due to 5d-4f transition. Bright blue long-lasting phosphorescence(LLP) could be observed after the excitation source was switched off. For the optimized sample, the blue long-lasting phosphorescence could last for nearly 4 h in the light perception of the dark-adapted human eye(0.32 mcd/m2). The effects of RE3+ ions on phosphorescence properties of the phosphors were studied, and the results showed that the co-doping of RE3+ ions greatly enhanced the intensity of the peak around 315 K which was related to the long lasting phosphorescence of the phosphors at room temperature and consequently improved the performance of the blue phosphorescence such as intensity and persistent time.
A series of novel blue long-lasting phosphorescence phosphors Sr6Al18Si2O37: Eu2 +, RE3 + (RE3 + = Ho3 +, Gd3 +, Dy3 + and Pr3 +) were prepared by the conventional high-temperature solid-state reaction in a reductive atmosphere. The phosphors emitted blue light that was related to the emission of Eu2 + due to 5d-4f transition. Bright blue long-lasting phosphorescence (LLP) could be observed after the excitation source was switched off. For the optimized sample, the blue long-lasting phosphorescence could last for nearly 4 h in the light perception of the dark-adapted human eye (0.32 mcd / m2). The effects of RE3 + ions on phosphorescence properties of the phosphors were studied, and the results showed that the co-doping of RE3 + ions greatly enhanced the intensity of the peak around 315 K which was related to the long lasting phosphorescence of the pho sphors at room temperature and improved improved the performance of the blue phosphorescence such as intensity and persistent time.