Patent ID: 8546842

Claim:
An LED chip assembly, comprising: an LED chip; a composite substrate; and a bonding material, wherein the LED chip is directly mounted on the substrate with the bonding material, the substrate is obtained by a process comprising infiltrating an inorganic formed body with at least one selected from the group consisting of aluminum and silicon, the substrate has a thickness of 0.1 to 2 mm, a surface roughness (Ra) of 0.5 microns or less, a thermal conductivity of 100 to 600 W/(m·k) at a temperature of 25° C., a coefficient of thermal expansion of 3 to 12×10 −6 /K at a temperature in a range of 25° C. to 150° C., and a three-point bending strength of 50 to 500 MPa, and an area of an LED chip-mounting surface on the composite substrate is 2 to 100 times an area of contact with the LED chip.