Abstract
A series of Ca1.97MgSi2O7−1.5xNx:0.01Eu2+,0.02Dy3+ (0 ≤ x ≤ 0.7) phosphors were prepared by solid-state reaction method, and the long-persistent luminescence properties were studied for LEDs application. XRD analysis reveals that the introduction of N element doesn’t cause obvious impurity phase in the phosphors. Smooth particle surface is obtained with the assistance of H3BO3 flux. Different Eu2+ emission centers have been verified via the luminescence spectra. By monitoring 535 nm, the excitation spectra of the phosphors cover a very broad range from 240 to 500 nm, which can match the LED chip well. When the N is doped, the emission intensity of Eu2+ can be increased largely at first, but is weakened if the N concentration is beyond x = 0.28. However, the long-afterglow time of Eu2+ starts to decrease when the N concentration exceeds x = 0.07. The corresponding afterglow mechanism is explained by the thermoluminescence curves and proposed model. By studying the temperature-dependent luminescence, it has been found that introducing N can increase the activation energy, but the thermal stability property needs improving in the further work.
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