Influence of photon recycling on semiconductor luminescence refrigeration

Semiconductor scintillator based on photon recycling

Direct-bandgap semiconductor with high quantum radiative efficiency can operate as a scintillator despite being ‘‘opaque’’ to its own luminescence. An interband absorption does not finish off the luminescence but merely creates a new minority carrier, which in turn recombines in a predominately radiative fashion. To take full advantage of this ‘‘photon recycling’’ effect, optically-tight integr...

Efficient luminescence extraction strategies and anti-reflective coatings to enhance optical refrigeration of semiconductors

Laser refrigeration of solids has emerged as a viable solution for vibration-free and compact cooling that does not require any moving parts or cryogenic liquid. So far, rare-earth doped glasses are the only bulk materials that have provided efficient laser cooling based on the anti-Stokes process. These materials have low indices of refraction and are suitable for efficient luminescence extrac...

A Study of Two High Efficiency Energy Conversion Processes: Semiconductor Photovoltaics and Semiconductor Luminescence Refrigeration

Radiation efficiency of heavily doped bulk n-InP semiconductor

Recombination of minority carriers in heavily doped n-InP wafers has been investigated using spectral and time-resolved photoluminescence at different temperatures. Studies of the transmitted luminescence were enabled by the partial transparency of the samples due to the Moss–Burstein effect. Temporal evolution of the transmitted luminescence shows virtually no effect of surface recombination b...

Hydrothermal synthesis of photo-catalyst and photo-luminescence polymer-CdS flexible nanocomposites

CdS nanoparticles are II-VI group semiconductor in nature with suitable band gap for photoluminescence and photo-catalyst applications. CdS nanostructures were synthesized via a facile precipitation method in the presence of green capping agents such as starch, glucose, gelatin, salicylic acid in the green solvent of water. The influence of concentration, surfactant, precipitating agent on the ...