Synthesis and luminescence properties of CaLaMgNbO6:Mn4+ red phosphor for UV-based w-LEDs

摘要

A series of CaLaMgNbO6:xMn(4+) (x = 0.0005, 0.001, 0.003, 0.005, 0.007, 0.009) phosphors were prepared by traditional solid-state method at high temperature. The structure and morphology of the samples were analyzed. The results showed that the prepared CaLaMgNbO6:xMn(4+) (CLMN:xMn(4+) phosphors were uniformly dispersed and the particle size was less than 5 mu m. CLMN:Mn4+ phosphors have the strongest excitation peak at 351 nm, which is caused by the (4)A(2g)-> T-2(2g) transition of Mn-4(+) ions. The strongest emission peak is at 697 nm, which is due to the E-2(g)->(4)A(2g) level transition of Mn-4(+). The optimum doping concentration is 0.5 mol.% and the mechanism of concentration quenching is the dipole-dipole interaction between Mn4+ ions. Importantly, CLMN:Mn4+ sample has good thermal stability ( 1 423 K/ 1 298 K = 48.3%). In addition, the color coordinates of all samples were concentrated in the far-red region (0.733, 0.267). The above results indicate that CLMN:Mn4+ sample has potential application value in the field of white light-emitting diodes (w-LEDs).