Patent ID: 8029699
Filing Date: 2011-10-04
Classification: C09K,H01L,Y02B,Y10T

Abstract:
1. A phosphor providing orange-yellow radiation for use in warm white LEDs (light emitting diodes), the phosphor comprising a substrate prepared from a rare-earth garnet and an activating agent prepared from cerium, wherein the substrate of the phosphor contains Li (lithium), Si (silicon), N (nitrogen) and F (fluorine) atoms, obtaining the overall stoichiometric equation of the phosphor substrate is: (ΣLn) 3 Al 5-x-y Li y/3 Mg x/2 Si (x/2+2y/3) F q/2 O 12-q N q/2 ; wherein the activating wavelength is 440˜475 nm, the orange sub-energy band becomes 542˜590 nm, and the radiation quantum output q>0.9, showing a cubic crystal garnet structure; and wherein the chemical variation of index is 0.001≦x≦0.005, 0.0001≦y≦0.0005 and 0.0001≦q≦0.001 and ΣLn is yttrium, lutetium, gadolinium, and cerium.