Rise of external quantum efficiency of LED by additional tunnel transparent layer.

摘要

Total efficiency of LED emission is determined by product of internal and external quantum efficiency. Internal quantum efficiency of current transformation into light is close to 100%. That’s why LED efficiency is first of all determined by efficiency of radiation coupling from LED-external quantum efficiency. That makes raising the external quantum efficiency the most important direction of development. The laws of physics don’t contradict further raise of external quantum efficiency. The major problem of radiation coupling is significant reflection of light at the interface of light-emitting surface and lens. The simplest way to solve this problem is to produce crystals and lenses from identical semiconductor materials, as you can see at fig.1.