Zwei Bemerkungen �ber den Unterschied von Lumineszenz- und Temperaturstrahlung

Abstract

1. Es wird gezeigt, daft eine dauernde Ahkiihlung eines fiuoreszierenden Gases int'olge .antistokesseher" Fluoreszenzemission in keinem Widersprueh zum zweiten l~Iauptsatz steht. 2. Es werclen Versuehe beschrieben, mit deren Hilfe die Giiltigkeit des K i r e h h o f fsehen Gesetzes ftir Gase (J2-Dampl') sowie die verschiedene Wirkung yon StGl~en auf Lumineszenz-and Temperaturstrahlung leieht einem grSlJeren Auditorium demonstriert werden kann. Die Modifizierbarkeit der Liehtemission dutch St01~e zweiter Art wird als wichtigstes Unterscheidungsmerkmal for die Lumineszenz im (legensatz zum Temperaturieuehten gekennzeiehnet.

A design of a PhC-enhanced LED for electroluminescence cooling

“…Optical refrigeration, or laser cooling, refers to cooling of macroscopic materials by anti-Stoke emission and was first theoretically investigated by Pringsheim in 1929. 29 For solid-state materials, the phenomenon was first experimentally demonstrated in rare-earth metal doped glasses in 1995. 30 In 2010, Seletskiy et al, reported laser cooling of ytterbium doped glasses to 110 K from room temperature.…”

Anti-Stokes luminescence in heavily doped semiconductors as a mechanism of laser cooling

“…In 1929, Pringsheim supposed that anti-Stokes emission can produce the cooling of the emitting medium [7]. He argues with Lenard, who thought that such a self-cooling is impossible on the basis of the second thermodynamic law.…”

“…Theoretical aspects of the optical refrigeration and of the luminescent efficiency in semiconductors are treated in Refs. [7][8][9][10][11][12][13][14][15]. Expected practical applications of the laser cooling are associated with an industrial scale refrigeration and freezing.…”

Modelling thermal parasitic load lines for an optical refrigerator

“…OR of rare earth doped insulator crystals, specifically ytterbium doped yttrium lithium fluoride (Yb:YLF), have shown the most promise for generating necessary cooling for infrared detectors, cooling below the NIST cryogenic standard of 123 K [1]. Insulator crystal OR utilizes an anti-Stokes phenomena [2] to generate cooling, using a photon to extract the crystal phonon energy and convert it to a higher energy photon. Doping the YLF crystal with a Yb 3+ ion splits the degenerate electronic states of the Yb 3+ ion, called crystal-field splitting, see figure 1 [3,4].…”