Determination of Plancks constant from the LED

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Material Metal

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Study of Planck’s Constant by means of LE

Several proposals to measure the Plancks Constant for didactical purposes, using the current voltage (I V) characteristics of a light emitting diode (LED) have been made quite regularly in the last few years. The physical interpretation however is not completely clear and this has raised many discussions, which have been published almost with same regularity as the proposals themselves.

Where, e is electronic charge, k is Boltzmann constant, T is absolute temperature and h is material constant which depends on the type of diode, the location of recombination region, etc.

Dependence of current (I) on temperature (T) at constant applied voltage (V)

The following facilities are built in for this

Current Meter