Luminescence refrigeration in semiconductors has recently attracted much interest and has developed into an active area of research. This dissertation focuses on understanding the fundamental mechanisms of luminescence refrigeration. To fulfill this task, the thermodynamic principles of luminescence refrigeration in semiconductors are investigated based on the balance equations for energy, entropy, and particle number. By taking background radiation into account, the output and input fluxes are examined using a thin-slab model in the steady state, through which the cooling efficiency and cooling power are obtained. The concept of radiation flux temperature is clarified and the origination of irreversible entropy generation during luminescence is investigated. The Eddington factor is also discussed.Schematic diagram of a blackbody at temperature T in an ambient environment at temperature Tb 35 2.11. Irreversible entropy generation ... Flow chart of a typical procedure of MBE growth calibration 51 3.8. (a) Flux versus cell temperature foranbsp;...

Title | : | Thermodynamic Analysis and Determination of Spontaneous Emission Quantum Efficiency for Luminescence Refrigeration in Semiconductors |

Author | : | |

Publisher | : | ProQuest - 2008 |

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