AUTOMOTIVE LED-total reflection

The problem of total reflection within the traditional square LED die in the most obvious, if the LED die material for the outer coating of the resin refractive index of 1.5, according to the calculation, the efficiency of its out about 4% only. LED light-emitting layer to solve the grain of the light emitted by the grain inside the total reflection of the problem, upgrading has become the focus of the efficiency of LED removed. Undermine the use of the geometry of the surface of LED die in the phenomenon of total reflection is the most commonly used method. Among them, the use of changes in grain shape to allow more light to leave the way of grain, OSRAM company SiC substrates for the relevant study, the same concept, in fact, before the earlier material has been used in AlGaInP out the efficiency of components on.