The electrons that participate in the conduction process are termed free electrons, which have energies greater than the Fermi energy. 参与导电过程的电子，我们称之为自由电子，其能量高于费米能级。
The emission intensity is given by the absorptance of the volume in which there is a difference of the quasi Fermi energies. 辐射强度由存在准费米能级差的体积的吸收率决定。
