NOVELTY - An electronic component assembly (10) comprises composite material carrier (11); circuit carrier (14) made of dielectric material; circuit (15) having conductive material; intermediate layer (13) between circuit carrier/composite material carrier and having material selected from nickel (Ni), titanium (Ti), chromium (Cr), aluminum (Al), tungsten (W), silicon (Si), molybdenum (Mo) and metal carbide; and electronic component (17) electrically connecting to circuit. The assembly further has connecting device (18) for connecting composite material carrier/electronic component.    USE - As an electronic component assembly, where electronic component includes light-emitting diode, laser diode, transistor, integrated circuit and solar cell (claimed).    ADVANTAGE - The assembly exhibits high light output performance; and improved thermal conductivity.    DETAILED DESCRIPTION - An electronic component assembly (10) comprises a composite material carrier (11); a circuit carrier (14) made of a first dielectric material; a circuit (15) formed on the circuit carrier and containing a conductive material; an intermediate layer (13) between the circuit carrier and the composite material carrier, and containing at least one material selected from nickel (Ni), titanium (Ti), chromium (Cr), aluminum (Al), tungsten (W), silicon (Si), molybdenum (Mo) and/or metal carbide; and an electronic component (17) arranged on the composite material carrier and electrically connecting to the circuit. The assembly further comprises an outer layer covering an outer surface of the composite material carrier. The electronic component assembly further comprises a connecting device (18) for connecting the composite material carrier and the electronic component, where the connecting device is selected from screwing, snap fitting, friction fitting, glue bonding, eutectic bonding, thermal bonding, ultrasonic bonding, pressure bonding, and surface active bonding.    DESCRIPTION OF DRAWING(S) - The figure shows schematic view of electronic component assembly.    Electronic component assembly (10)    Composite material carrier (11)    Intermediate layer (13)    Circuit carrier (14)    Circuit (15)    Wiring (16)    Electronic component (17)    Connecting device. (18)