Design of a novel WLED structure based on the non-rare-earth Ca2Y(Nb,Sb)O6:Mn4+ materials

Abstract

Herein, the novel white light-emitting diode (WLED) structures based on the Ca2Y(Nb,Sb)O6:Mn4+ materials were presented. The crystal structure, morphology, elemental composition, luminescent behavior, thermal stability, quantum yield, decay curve, and color purity of Ca2YSbO6:Mn4+ (CYS:Mn4+) and Ca2YNbO6:Mn4+ (CYN:Mn4+) phosphors were investigated and compared in detail. For these phosphors, the concentration quenching (CQ) mechanism is different. For CYS:Mn4+ phosphors, the dipole-dipole interaction dominates the CQ while the dipole-quadrupole interaction is dominant in CYN:Mn4+ phosphors. The emission intensity of the optimal CYN:Mn4+ phosphors was stronger than that of the CYS:Mn4+ phosphors. Meanwhile, the color purities of the optimal CYS:0.003Mn4+ and CYN:0.003Mn4+ phosphors were calculated to be as high as 96.40% and 96.91%, respectively. Eventually, it is interesting that the packaged novel WLED structure would improve the color rendering index and correlated color temperature values. From the above results, non-rare-earth Ca2Y(Nb,Sb)O6:Mn4+ materials with high color purities could be proposed for WLED devices.