Nitrogen-induced enhancement of luminescence of blue-emitting Sr_2MgSi_2O_7:Eu~(2+) phosphors for light-emitting di-odes

摘要

The near-ultraviolet (n-UV) excited blue-emitting Sr_2MgSi_2O_7:Eu~(2+) phosphors are used for fluorescence lamp and tricolor white LEDs. The effect of nitrogen-doped on the structure of the host and the enhancement of photoluminescence is experimentally investigated. The results show that as the amount of nitrogen-doped varies from 0 to 0.6 (at.), the luminous intensity is found to be increased to 169%, and the partial replacement of 0 by N results in a change of the crystal field by modifying the symmetry of the crystal structure. M a result, with the nitrogen-doped in small amount, the luminous intensity, chromaticity coordinates and the color purity can be adjusted to a desired value in the applications.