This effect is known as the photoelectric effect the

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: o the sensitivity of photodiodes when receiving light emissions. 190 © Festo Didactic GmbH & Co. KG • FP 1110 11. Physical fundamentals Luminescent diodes represent a relatively small spectral width of the emitted light, which is generally between 30 – 140 nm (spectral halfwidth), see Fig. 11.4.5. 100 % 80 60 Rel. radiant intensity 1 40 20 0 850 900 950 Wavelength 1000 nm 1050 Spectral halfwidth (1) Fig. 11.4.5: Emission spectrum of a GaAs-LED Photodiodes Photodiodes are semi-conductor components which are based on the principle of single-crystaline silicone or germanium. They are constructed in the same way as ordinary semiconductor diodes and have a barrier layer which is however very closely arranged underneath the crystal surface. If the diode is exposed to light emission, then the photons penetrating the crystal (quantum of the optical radiation) are absorbed and electrical charge carrier pairs are created. This effect is known as the photoelectric effect. The charge carrier pairs are separated in the barrier layer and an electrical current is created, i.e. the photoc...
View Full Document

This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.

Ask a homework question - tutors are online