Red fluorescent materials and preparation methods thereof

摘要

The invention provides a red fluorescent material of which the chemical formula is (Li1−a−bMIaMII2b)2+m(Gd1−x−yEuxLny)4−2b(MoO4)7−c−z(WO4)c(A)Z. The invention further provides a preparation method of the red fluorescent material, and an electric light source prepared from the red fluorescent material and a preparation method of the electric light source. The invention has the beneficial effect that the red fluorescent material uses Eu3+ ions as the main activator; under the excitation of near ultraviolet light or blue light emitted by a semiconductor LED chip, the red fluorescent material has high light conversion efficiency, and emits light in a mode of red sharp lines of characteristic 4f electron-configuration 5D0−>7F2 energy level transition of Eu3+; and the red fluorescent material has high color purity, high emissive power and stable performance.

主权项

1. A red fluorescent material, wherein the chemical formula of the red fluorescent material is:
(Li1−a−bMIaMII2b)2+m(Gd1−x−yEuxLny)4−2b(MoO4)7−c−z(WO4)c(A)Z; MI is one or more of the group consisting of Ag, Na, K, Rb and Cs; MII is one or more of the group consisting of Be, Mg, Ca, Sr, Ba, Zn, Mn, Pb, Cd and Cu; Ln is one or more of the group consisting of Bi, Al, Ga, In, Sc, Y, La, Ce, Pr, Nd, Sm, Tb, Dy, Ho, Er, Tm, Yb and Lu; A is a group formed by bonding of oxygen with one or more of the group consisting of B, Si, Ge, Ti, Zr, Hf, V, Nb, Ta and P or a halogen anion; 0≦a≦1, 0≦b≦1, 0≦a+b≦1, 0≦c≦7, 0≦z≦2, 0≦c+z≦7, 0