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Abstract

Disclosed are smoothing phosphors for AC LED lighting that are capable of prolonging the light emission time of an AC LED (or array of AC LEDs) during a ½ cycle response to a phase change of the alternating current to substantially reduce flicker. The smoothing phosphor of the present teachings comprises a matrix represented by the formula: M_(l-k-r-v)X_(m-p)Al_{2(n-0.5x-0.5y)}O_{3(n-0.5x-0.5y)}: Mn_(x+p)O_(x+p), Si_yO_2y, Eu_k, R_r, Li_v wherein M is at least one of La₂O₃, Ce₂O₃, Gd₂O₃, Lu₂O₃, Ba₂OF₂, Sr₂OF₂, Ca₂OF₂, Ba₂OCl₂, Sr₂OCl₂, Ca₂OCl₂, BaO, SrO, CaO, or ZnO; provided that when M comprises BaO, SrO, CaO, or ZnO, M does not comprise La₂O₃, Ce₂O₃, Gd₂O₃, Lu₂O₃, Ba₂OF₂, Sr₂OF₂, Ca₂OF₂, Ba₂OCl₂, Sr₂OCl₂, or Ca₂OCl₂; X is at least one of MgO or ZnO; R is at least one of Sm, Pr, Tb, Dy, Er, or Ho; m=0 to 2; n=4 to 11; x=0.005 to 1; y=0.005 to 1; p=0 to 1; k=0 to 0.2; r=0 to 0.2; and v=0 to 0.2.

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First Claim