# Exercise 5.2.2 Fresnel Equations and LEDs

| Consider a simple light emitting diode, working as shown schematically. All the light is generated in a small volume as indicated, and we assume that the semiconductor is fully transparent (which is not really true). The index of refraction of semiconductors is rather large; you may take it to be n = 3
|  | The simple question is: How much (in %) of the light generated is transmitted through the front (upper) surface?
|  | Suggest measures to improve that percentage.
| Link to the solution

With frame

5.2.2 Fresnel Equations

Solution to Exercise 5.1-1: Derivation of Snellius Law

Solution to Exercise 5.2-1: Fresnel Equations and LEDs

© H. Föll (Advanced Materials B, part 1 - script)