Synthesis and luminescent properties of novel red-emitting phosphor InNbO4:Eu3+ for white light emitting diodes

Red-emitting phosphor InNbO4:Eu3+ was synthesized by solid-state reaction. The crystal structure, particle size distribution, and luminescence properties were respectively analyzed. The XRD pattern shows that pure InNbO4:Eu3+ was obtained. The spectra reveal that the phosphor can be effectively excited under excitation with 394 nm and 466 to emit strong red light at 612 nm due to the D-5(0)-> F-7(2) transition of Eu3+. The perfect Eu3+-doped concentration is 4 mol%. The chromaticity coordinates of InNbO4:0.04Eu(3+) are closer to the National Television Standard Committee (NTSC) standard values. Thus the InNbO4:Eu3+ is a promising red-emitting phosphor for white light emitting diodes.