Eu²⁺ and Mn²⁺ codoped Ba₂Mg(BO₃)₂--new red phosphor for white LEDs.

Shuanglong Yuan (1) , Yunxia Yang , Xianghua Zhang (1) , Franck Tessier (1) , François Cheviré (1) , Jean-Luc Adam (1) , Bernard Moine (2) , Guorong Chen

1 ISCR - Institut des Sciences Chimiques de Rennes
2 LPCML - Laboratoire de Physico-Chimie des Matériaux Luminescents

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 250-450 nm, which is adaptable to the emission band of near-ultraviolet LED chips (350-420 nm). Upon the excitation of 365 nm light, the phosphor exhibits strong red emission centered at 615 nm. 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.

Domaines: Matériaux

Shuanglong Yuan, Yunxia Yang, Xianghua Zhang, Franck Tessier, François Cheviré, et al.. Eu²⁺ and Mn²⁺ codoped Ba₂Mg(BO₃)₂--new red phosphor for white LEDs.. Optics Letters, 2008, 33 (23), pp.2865-7. ⟨10.1364/OL.33.002865⟩. ⟨hal-00862554⟩