1. A long-persistent phosphor Sr3MgSi2O8-1.5xNx:Eu2+,Dy3+,Mn2+ based on white LEDs applications.
- Author
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Zhang, Jia and Chen, Guibin
- Subjects
- *
PHOSPHORS , *DIPOLE-dipole interactions , *X-ray spectra , *ENERGY transfer , *MOLECULAR spectra , *LUMINESCENCE - Abstract
The N-doped Sr 2.985 Mg 1-y Si 2 O 8 :0.005Eu2+,0.01Dy3+,yMn2+ (0 ≤ y ≤ 0.15) phosphors were designed to obtain long-persistent phosphors for white LEDs. All the samples were determined to be single-phase by XRD analysis. The particles show smooth surface with the help of the H 3 BO 3 flux. The energy-dispersive X-ray spectrum indicates the existence of N element. Various Eu2+ emission centers have been gained and verified by the photoluminescence spectra and long-persistent emission spectra, and a red-shift of the Eu2+ emission was observed in the N-doped samples due to the nephelauxetic effect. In Eu2+-Mn2+ co-activated phosphors, tunable emission has been realized and an efficient energy transfer from Eu2+ to Mn2+ was found, which could belong to the dipole-dipole interaction mechanism. The optimal afterglow time was obtained in the Sr 2.985 MgSi 2 O 7.76 N 0.16 :0.005Eu2+,0.01Dy3+ sample, but doping Mn2+ reduces the afterglow time largely. The mechanism for the increase of luminescence intensity and afterglow time with N present was interpreted. The temperature-dependent luminescence was also evaluated. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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