Performing this experiment is not difficult and it can be
carried out in daylight as any light interference is shielded by
the tube.
When is an LED a receiver? A light emitting diode or LED is an
electronic semiconductor component. If a current flows through the
LED in the conduction direction it emits light. Physically,
semiconductors are characterised by a band gap, i.e. an
energetically forbidden zone for electrons. This energy gap between
the valence band and the conducting band essentially determines the
electrical and optical properties. E.g. a photon whose energy is
less than the band gap energy of the semiconductor cannot create an
electron-hole pair. In this experiment you will determine the size
of the band gaps of the LED relative to one other.
| Materiallist (Excerpt) |
Product |
Amount |
|
Power supply 0...12 V DC/ 6 V, 12 V AC, 230 V
|
13505-93
|
1
|
|
DMM with NiCr-Ni thermo couple
|
07122-00
|
1
|
|
Support base variable
|
02001-00
|
1
|
|
LED - UV, with series resistor and 4 mm plugs
|
09852-50
|
1
|
|
LED - IR, with series resistor and 4 mm plugs
|
09852-10
|
1
|
|
LED - red, with series resistor and 4 mm plugs
|
09852-20
|
1
|
|
LED - green, with series resistor and 4 mm plugs
|
09852-30
|
1
|
|
LED - blue, with series resistor and 4 mm plugs
|
09852-40
|
1
|
|
Stray light tube for LED, Di = 8 mm, l = 40 mm
|
09852-01
|
1
|
|
Support rod, stainless steel, l = 600 mm, d = 10 mm
|
02037-00
|
2
|
|
Slide mount without angle scale
|
09851-02
|
2
|
|
Diaphragm holder, attachable
|
11604-09
|
2
|
|
Connecting cord, 32 A, 750 mm, red
|
07362-01
|
2
|
|
Connecting cord, 32 A, 750 mm, blue
|
07362-04
|
2
|
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