White light emitting device based on UV LED and phosphor blend

摘要

A light source including a specific LED and phosphor combination capable of emitting white light for direct illumination. In one embodiment, the light source includes an LED chip emitting in the 380-420 nm range radiationally coupled to a phosphor blend first phosphor selected from the group consisting of (Sr,Ba,Ca,Mg)₅(PO₄)₃Cl:Eu² (SECA) and BaMg₂Al₁₆O₂₇:Eu² with a second phosphor having the formula (Tb_1-x-yA_xRE_y)₃D_zO₁₂ (TAG), where A is a member selected from the group consisting of Y, La, Gd, and Sm; RE is a member selected from the group consisting of Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Lu; D is a member selected from the group consisting of Al, Ga, and In; x is in the range from 0 to about 0.5, y is in the range from about 0 to about 0.2, and z is in the range from about 4 to about 5. The light source thus produced will provide a high quality white light.