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Use LED for photodiode

https://youtu.be/_Qf7YkJFlzY




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Light Emitting Diode The “Light Emitting Diode” or LED as it is more commonly called, is basically just a specialised type of diode as they have very similar electrical characteristics to a PN junction diode. This means that an LED will pass current in its forward direction but block the flow of current in the reverse direction. • Light emitting diodes are made from a very thin layer of fairly heavily doped semiconductor material and depending on the semiconductor material used and the amount of doping, when forward biased an LED will emit a coloured light at a particular spectral wavelength. • When the diode is forward biased, electrons from the semiconductors conduction band recombine with holes from the valence band releasing sufficient energy to produce photons which emit a monochromatic (single colour) of light. Because of this thin layer a reasonable number of these photons can leave the junction and radiate away producing a coloured light output. • Also, nearly al...

Multivibrator circuit

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Types of Light Emitting Diode  • Gallium Arsenide (GaAs) – infra-red • Gallium Arsenide Phosphide (GaAsP) – red to infra-red, orange • Aluminium Gallium Arsenide Phosphide (AlGaAsP) – high-brightness red, orange-red, orange, and yellow  • Gallium Phosphide (GaP) – red, yellow and green  • Aluminium Gallium Phosphide (AlGaP) – green  • Gallium Nitride (GaN) – green, emerald green  • Gallium Indium Nitride (GaInN) – near ultraviolet, bluish-green and blue  • Silicon Carbide (SiC) – blue as a substrate  • Zinc Selenide (ZnSe) – blue  • Aluminium Gallium Nitride (AlGaN) – ultraviolet Light Emitting Diodes I-V Characteristics.