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Opto electronics devices
- 1. Introduction to Optoelectronic Devices G.Aarthi Assistant Professor / SENSE VIT University Email: aarthi.g@vit.ac.in
- 4. Examples of Optoelectronic Devices
- 6. Light-Emitting Diodes (LEDs) Light-emitting diode ( LED ) is a semiconductor diode that emits incoherent narrow-spectrum light when electrically biased in the forward direction of the p-n junction.
- 7. Photon Emission in Semiconductor When an electron meets a hole, it falls into a lower energy level, and releases energy in the form of a photon. The wavelength of the light depends on the band gap of the semiconductor material Semiconductor materials: Si, Ge, GaAs, InGaAs, AlGaAs, InP, SiGe, etc E F E C E V Conduction band Valence band Photon E g
- 8. Semiconductor Materials vs. LED Color General Brightness GaP GaN GaAs GaAIAs -- Green , Red Blue Red , Infrared Red , Infrared -- Super Brightness GaAIAs GaAsP GaN InGaN GaP Red Red , Yellow Blue Green Green Ultra Brightness GaAIAs InGaAIP GaN InGaN -- Red Red , Yellow , Orange Blue Green --
- 10. Laser Diodes (LDs) Lasers (Light Amplification by Stimulated Emission) Photon emission processes: Absorption Photodetectors Spontaneous emission LEDs Stimulated emission Lasers
- 11. Photo Diodes (PDs) A photodiode is a semiconductor diode that functions as a photodetector. It is a p-n junction or p-i-n structure. When a photon of sufficient energy strikes the diode, it excites an electron thereby creating a mobile electron and a positively charged electron hole
- 12. PDs’ Detection Range and Materials Material Wavelength range (nm) Silicon (Si) 190–1100 Germanium (Ge) 400–1700 Indium gallium arsenide (InGaAs) Lead sulfide (PbS) 800–2600 <1000-3500
- 14. Residential and Commercial Applications Challenges: cost reduction via: a) economy of scales b) building integration and c) high efficiency cells
- 17. Advantages of Optical Comm.
Notas do Editor
- Optoelectronics is the study area lies at combination between electronics and optics. It is based on the quantum mechanical effects of light on the semiconductor material. The optoelectronic devices functions as electrical to optical or optical to electrical transducers.
- LED is the device used to emit light when it is applied electrical bias. The condition for the emitting is that it must be applied a electric bias. The emission light color depends on the composition of the semiconductor material used. Now let’s look at how light is generated in LED. The light can be infrared, visible and UV light.
- In semicondutor, after the electron is excited to higher energy level, it can only stay in certain enregy band, range