Phosphor for blue-light led, blue-light led using same

摘要

A phosphor for blue-light LEDs formed by different solid solutions of (ΣLn)₃Al₅O₁₂ and Me^II₃Me^III₂Si₃O₁₂ with a ratio of (1-x):x having a stoichiometry of (ΣLn)_3-xMe^II_3xMe^III_2xAl_5-xSi_3xO₁₂, in which Ln=Y and/or Gd and/or Lu and/or Ce and/or Yb and/or Pr and/or Sm, Me^II=Mg and/or Ca and/or Sr and/or Ba Me^III=In and/or Ga and/or Sc, in which 0.0001≦x≦0.2. The specific composition of the phosphor has a color coordinate of x≧0.42 and the total coordination number of Σ(x+y)≧0.92. The radiation of the phosphor is in the range of λ=500˜750 nm and the position of the maximum spectrum changes from λ=520˜585 nm. The light-emitting diodes made from this phosphor can emit very bright, warm white light with light intensity reaching 400˜600 cd, total flux F420 lm, and light efficiency over 100 lm/W.