White LED lamp, backlight, light emitting device, display device and illumination device

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 blue phosphor powder contains the blue phosphor powder having the composition expressed by an equation (1):
• (Sr1-x-y-zBaxCayEuz)5(PO4)3Cl (1)
• wherein x, y and z respectively satisfy the relations 0≦x≦0.5, 0≦y<0.1, 0.005<z<0.1;
• said yellow phosphor powder contains at least one of the yellow phosphor powder having the composition expressed by an equation (3):
• ZnS:
• AucAld (3)
• wherein c and d respectively satisfy the relations 0.0001<c, d<0.002 and the yellow phosphor powder having the composition expressed by an equation (4):
• (Sr2-x-y-z-uBaxMgyEuzMnu)SiO4 (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;
• and
• said red phosphor powder contains at least one of the red phosphor powder having the composition expressed by an equation (5):
• (La1-x-yEuxMy)2O2S (5)
• wherein M is at least one element selected from a group consisting of Sb, Sm, Ga and Sn, while x and y respectively satisfy the relations 0.01<x<0.15, 0≦y<0.03
• and the red phosphor powder having the composition expressed by equation (6):
• (SrxCa1-x)SiAlN3:Eu (6)
• wherein x satisfies a relation 0≦x<0.4.