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Eu 2 + and Mn 2 + codoped Ba 2 Mg ( B O 3 ) 2 —new red phosphor for white LEDs

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Abstract

A new red phosphor, Ba2Mg(BO3)2:Eu,Mn, was synthesized by the solid-state reaction method and its photoluminescence properties were investigated by excitation and emission spectra and decay curves. Its excitation band is extending from 250450nm, which is adaptable to the emission band of near-ultraviolet LED chips (350420nm). Upon the excitation of 365nm light, the phosphor exhibits strong red emission centered at 615nm. The relationship between Eu2+ and Mn2+ dopants was studied from the viewpoint of a crystal structure and by photoluminescence spectra and decay curves. The results show that the characteristic Eu2+ emission predominate in the emission band and Mn2+ promote the redistribution of Eu2+ at the cation sites of the host crystal.

© 2008 Optical Society of America

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