A novel red phosphor for near UVInGaN light-emitting diode and its luminescent properties

A series of new red phosphors, NaEu(MoO4)(2-2x)(SO4)(2x), were prepared by the conventional solid state reaction. Their excitation spectra, emission spectra and decay curves were measured at room temperature. When the SO42- content is in excess of 20%, other phases appear. With the introduction of SO42-, the Mo-O charge transfer band of NaEu(MoO4)(2-2x)(SO4)(2), shows red shift, and the excitation intensities of the 4f - 4f transitions of Eu3+ are strengthened, compared with that of NaEu(MoO4)(2). The single red light-emitting diodes-based these phosphors were fabricated. The light-emitting diode fabricated with the phosphor NaEu (MoO4)(1.80)(SO4)(0.20) exhibited higher red emission relative to that with NaEu(MoO4)(2). Bright red light can be observed by naked eyes from the light-emitting diode-based NaEu(MoO4)(1.80)(SO4)(0.20). (C) 2007 Published by Elsevier Ltd.