Nitrogen-induced enhancement of luminescence of blue-emitting Sr₂MgSi₂O₇:Eu²⁺ phosphors for light-emitting diodes

Abstract

The near-ultraviolet (n-UV) excited blue-emitting Sr₂MgSi₂O₇:Eu²⁺ 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 O by N results in a change of the crystal field by modifying the symmetry of the crystal structure. As 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.

Keywords

Diffuse Reflection Spectrum / Apply Physic Letter / Luminous Intensity / Color Purity / High Color Purity

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This work has been supported by the National Natural Science Foundation of China (No. 50872091) and Tianjin Key Subject for Materials Physics and Chemistry (No. 2006ZD30).