Patent ID: 9299888
Filing Date: 2016-03-29
CPC Classification: H01L

Claim Text:
1. A clad material for use with a substrate for holding an LED light-emitting element, formed by lamination of a plurality of layers consisting of different materials, and bonded to a group III-V semiconductor crystal surface via a metal layer, having a coefficient of linear expansion of 14 ×10 −6 /K or less, and a thermal conductivity of 200 W/mK or more at a temperature of 25 ° C., consisting of five layers formed by alternately laminating three copper layers and two molybdenum layers, the copper and molybdenum being at least 99.9 percent purity, wherein a proportion of a volume occupied by the molybdenum layers relative to that of the clad material is 20 to 70 vol %, a thickness difference between any two copper layers is 5% or less, a thickness difference between the two molybdenum layers is 5% or less, and a surface roughness (Ra) of the clad material is 0.01 to 0.09 μm, and wherein a volume resistivity of the clad material is 10