- Temperature Dependence
Because room temperature energies are sufficient to cause
the impurity-to-conduction-band transition, the temperature dependence
of phosphorescence is difficult to see. With low temperatures
such as liquid nitrogen, you will see it.
- With the computer program, we can simulate low temperatures.
As demonstrated in the program, the toothbrush is dipped in
liquid nitrogen that has a temperature of 196°C.
The temperature of the toothbrush is about -200 °C when it
is brought near the heat lamp. Experiment with the energies
until you can explain how the temperature at which an object
glows in the dark is related to the energy differences between
the conduction and impurity energy bands.