ISSN:
1432-0630
Keywords:
PACS: 78.20; 78.60
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract. Based on microscopic transition probabilities and on the principle of detailed balance, absorption and emission rates are calculated for indirect transitions. It is found that the emission rate at a photon energy ħ ω can be expressed by the absorption coefficient for the same photon energy in the same way as for direct transitions. This relation is quite generally valid including cases where the electrons in the exited state (conduction band) and the electrons in the ground state (valence band) are distributed according to two different quasi-Fermi distributions. A generalized Planck's law is formulated for luminescence which contains a nonzero chemical potential of the emitted photons as the only difference to the description of thermal radiation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01577615
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