Patent ID: 9039218
Filing Date: 2015-05-26
Classification: C09K,H01L,H05B,Y02B

Abstract:
1. A white LED lamp comprising: a conductive portion; a light emitting diode chip, which is mounted on the conductive portion, for emitting a primary light having a peak wavelength of 360 nm to 420 nm; a transparent resin layer, which is composed of a silicone resin as a first hardened transparent resin, for sealing the light emitting diode chip; and a phosphor layer for covering the transparent resin layer, the phosphor layer being formed by dispersing a phosphor powder into a second hardened transparent resin, and the phosphor powder receiving the primary light and radiating a secondary light having a wavelength longer than that of the primary light, wherein the phosphor powder has an average grain size of 10 to 100 μm, the phosphor layer has a thickness of 0.1 to 1.5 mm, and an energy of the primary light contained in the radiated secondary light is 0.4 mW/lm or less, said phosphor powder contains a blue phosphor powder for emitting blue light, a yellow phosphor powder for emitting yellow light, and a red phosphor powder for emitting red light, and said yellow phosphor powder contains a yellow phosphor powder having a composition expressed by an equation (4): wherein x, y, z and u respectively satisfy the relations 0.1<x<0.4, 0.005<y<0.21, 0.05<z<0.3, 0.001<u<0.04.