Light extraction efficiency from visible light-emitting diodes

Summary form only given. Because escape probability is about 2% per radiating surface, it is a good idea to use all six emitting surfaces of a solid rectangular LED. We introduce a photonic gas model for modelling this type of LED. Light extraction efficiency in thick (250/spl times/250/spl times/250 /spl mu/m) transparent substrate LED is a result of competition of light escape from the semiconductor chip, reabsorption in the active layer, and free-carrier absorption in the bulk. This modelling is confirmed by Monte Carlo simulations.