LED Barrier Layer Prevents Metal Diffusion

The patent applies composite materials by creating a metal multilayer barrier layer comprising alternating layers of first metal material and second metal material. This multilayer composite structure provides enhanced metal diffusion prevention capability compared to a single-layer barrier, allowing effective protection at high temperatures without requiring excessive thickness. The different metal materials in the composite structure create multiple diffusion barriers that work synergistically to prevent metal migration between the reflective layer and connecting structure.

The patent segments the barrier layer into multiple thin alternating layers of different metal materials rather than using a single thick layer. This segmentation creates multiple interfaces that impede metal diffusion paths, with each metal layer acting as a separate barrier. The segmented multilayer structure achieves superior diffusion prevention with reduced overall thickness compared to a conventional single-layer barrier.

The patent uses composite materials in the metal multilayer barrier layer where alternating layers of different metal materials create a complex diffusion barrier. This composite structure is specifically effective when the metal connecting structure and reflective layer share the same metal element, as the alternating metal layers in the barrier prevent other alloy elements from migrating across the interface, thereby maintaining bonding ease while preventing diffusion.

The metal multilayer barrier layer acts as an intermediary structure between the metal connecting structure and metal reflective layer. When both sides contain the same metal element, this intermediary multilayer barrier prevents direct interaction and diffusion of other alloy elements, mediating the interface to maintain both bonding facilitation and diffusion prevention.

The patent employs composite materials through a metal multilayer barrier structure that achieves effective metal diffusion prevention at high temperatures without requiring excessive thickness. The alternating metal layers create multiple diffusion barriers that collectively provide high-temperature protection, eliminating the need for a single thick barrier layer that would generate internal stress.

The patent segments the barrier function into multiple thin alternating metal layers rather than using one thick layer. This segmentation provides sufficient diffusion prevention at high temperatures while keeping each individual layer thin, thereby avoiding the stress issues associated with thick single-layer barriers.