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

Herein, the novel white light-emitting diode (WLED) structures based on the Ca 2 Y(Nb,Sb)O 6 :Mn 4+ materials were presented. The crystal structure, morphology, elemental composition, luminescent behavior, thermal stability, quantum yield, decay curve, and color purity of Ca 2 YSbO 6 :Mn 4+ (CYS:Mn 4+ ) and Ca 2 YNbO 6 :Mn 4+ (CYN:Mn 4+ ) phosphors were investigated and compared in detail. For these phosphors, the concentration quenching (CQ) mechanism is different. For CYS:Mn 4+ phosphors, the dipole-dipole interaction dominates the CQ while the dipole-quadrupole interaction is dominant in CYN:Mn 4+ phosphors. The emission intensity of the optimal CYN:Mn 4+ phosphors was stronger than that of the CYS:Mn 4+ phosphors. Meanwhile, the color purities of the optimal CYS:0.003Mn 4+ and CYN:0.003Mn 4+ 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 Ca 2 Y(Nb,Sb)O 6 :Mn 4+ materials with high color purities could be proposed for WLED devices.