Quantum dots
Experiment no.: 7.2.21
New
since 07/24
Similar to atoms, quantum dots also have discrete energy levels. When a quantum dot is illuminated with UV light, an electron in the quantum dot can be excited to a state of higher energy. When the excited electron returns to a lower level, it emits its energy in form of light. The colour of the light depends on the size of the quantum dot. The larger a quantum dot is, the longer the wavelength of the emitted light.
In this experiment, CdTe quantum dots of different sizes (diameter approx. 1.5 nm to 4.5 nm), which are dissolved in water, are used and excited with UV light.
In this experiment, CdTe quantum dots of different sizes (diameter approx. 1.5 nm to 4.5 nm), which are dissolved in water, are used and excited with UV light.
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Connection between diameter and wavelength
