Luminescent properties of novel red-emitting phosphor Na3TaF8 with non-equivalent doping of Mn4+ for LED backlighting.

Herein, a new red-emitting phosphor, Na 3 TaF 8 :Mn 4+ , was synthesized by non-equivalent doping of Mn 4+ under mild condition. Its crystal structure and morphology were characterized by the powder X-ray diffraction (XRD), scanning electron microscopy (SEM). This sample is of single phase with monoclinic crystal structure. Mn 4+ might occupy the site of Ta 5+ in Na 3 TaF 8 , being located at the center of uniquely tetragonal anti-prism coordinated by eight F - . The as-prepared Na 3 TaF 8 :Mn 4+ has sharp red emissions with higher color purity under the blue light excitation. The luminescent behavior of Mn 4+ in such host is similar with that in some hexafluorides with disordered octahedral structure. Intense red light can be observed from the single red LED based on Na 3 TaF 8 :Mn 4+ . These results show this phosphor to be a potentially red component for LED backlighting. [ABSTRACT FROM AUTHOR]