Diode Red

How can i know a diode ??

how can i identify a diode ?? for example, i've wanted to construct a circuit that includes diodes and zeners,, but i have many of them with different colors,one with a red p terminal,,another with a blue one ...
so is there a way ( as colors in a resistor ) to know what diode to use ???

thnx alot

As the others say, the cathode is usually marked with a dot or band.

If there is a number printed on it, look up that number and get it's data sheet.

One other factor is size. If it is about the size or smaller than a 1/4 watt resistor, it is a signal diode, and will handle only low currents, on the order of 100ma or less.

After that, the bigger it is, the more current it can handle. Most diodes without a heat sink can handle 1 amp or perhaps 2.

If it has a stud on it, like the end of a bolt, or if it's in the form of a cylinder and designed to be press-fitted in a heat sink, it can handle 10 amps or higher, but only with the proper heat sink attached.

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How to determine the band gap?

Hi,

A common light-emitting diode is made from a combination of gallium, arsenic, and phosphorus (GaAsP) and emits red light at 650 nm.

What is its band gap?

Could you please show working.

Thanks

The bandgap is roughly the energy of the photon that the material emits. In this case, the bandgap is

Band Gap = hc/lambda = (6.62E-34)(3E8) / 650E-9

use your calculator. The answer is in joules, to convert to eVs, divide this by 1.6E-19.