A flexible multilayer substrate for attaching a light emitting semiconductor device includes a first dielectric layer, a circuit layer on the first dielectric layer; a first thermally conductive layer on the circuit layer; a discontinuous metal support layer having a plurality of openings therethrough disposed on the first thermally conductive layer, and a second thermally conductive layer on the support layer. The flexible multilayer substrate further includes a plurality of conductive vias extending through the first dielectric layer such that the circuit layer is in communication with the plurality of conductive vias. The first and second thermally conductive layers are in contact within said openings.