quantum efficiency


Also found in: Dictionary, Medical, Acronyms, Wikipedia.

quantum efficiency

A measure of the efficiency of conversion or utilization of light or other radiation. It is given by the proportion of incident photons, of a particular frequency, that are converted by a device into a useful form, such as a permanent record. Photographic emulsions, at best, record only a few photons out of every thousand falling on them. Electronic detectors have a much higher efficiency.

quantum efficiency

[′kwän·təm i‚fish·ən·sē]
(electronics)
The average number of electrons photoelectrically emitted from a photocathode per incident photon of a given wavelength in a phototube.
References in periodicals archive ?
The increase in the electrical conductivity of the saline solutions used in the irrigation of the plants negatively affected the quantum efficiency of photosystem II and the electron flow per reaction center, thus modifying the emission of chlorophyll a fluorescence, implying severe damage to the photosynthetic apparatus of the sorghum plants.
where [[lambda].sup.4.sub.peak]/8[pi][cn.sup.2] can be regarded as a constant and [eta] is the quantum efficiency. The calculated results have been shown in Table 1 and Figure 5.
Desoete, "On the ideal performance of solar cells with larger-than-unity quantum efficiency," Solar Energy Materials and Solar Cells, vol.
The quantum efficiency defines how efficiently the optical energy is converted into electrical energy.
With regard to this issue, we developed a photon detection system that has high quantum efficiency (988%) and is able to discriminate the number of incident photons.
(b) Normalized fluorescence enhancement (blue) and modified quantum efficiency (green) of a single emitter with intrinsic quantum efficiency 0.3.
It is noted that our LED devices which are fabricated using the above InGaN/GaN MQW structure show an external quantum efficiency of up to 24.2% (light output power of 13.31 mW at 20 mA current injection).
However, the effects of MWCNT pretreatment, MWCNT content, and synthetic conditions of MWCNT-Ti[O.sub.2] nanocomposite on its photocatalytic hydrogen evolution efficiency and quantum efficiency under monochromatic light irradiation are still beyond our knowledge.
Tansu, "Approaches for high internal quantum efficiency green InGaN light-emitting diodes with large overlap quantum wells," Optics Express, vol.
In this case, one calculates the quantum efficiency of energy transfer:
The CMOS process and the pixel architecture influences the photon to electron conversion efficiency termed quantum efficiency, and the effective area of this conversion zone in two dimensions has to be considered for light from UV to NIRb (near infra red).
The X-ray detector possesses known active silicon thicknesses and 100 percent internal quantum efficiency, making possible absolute measurement of X-ray flux with energies 100 keV and beyond.

Full browser ?