Determination of Plancks constant from the LED

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Product Description

Study of Plancks 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

A highly stable current source with 3 digit display.
Range : 0-2000A/ 20mA

Oven

It is a small temperature controlled oven with built-in RTD sensor.
Temperature adjustable from ambient to 80 degree celcius
Digital display of temperature
High stability
Variable Voltage Source (0-2.75V)
A high stability voltage source with 3digit display

Material Constant

To draw I-V characteristics of LED for determination of h, a variable voltage source and a current meter are provided with 3 digit display.

The wavelength l of light emitted by LED

These are taken from LED datasheet

Specification

Packaging Type	corrugated boxes
Material	Stainless Steel
Type	Digital
Model Name/Number	AE 263A
Power Supply	ac mains
Usage/Application	laboratory