Abstract
This study was launched to demonstrate that LEDs at zero bias show recombination photon emissions, and to check the models for the same. A method for measuring the light emission for a LED near zero bias is presented. A large reverse bias sufficient to suppress detectable emissions is assumed. The bias voltage between ‘large reverse’ and our target voltage is modulated, and the difference measured. The measured emissions found are consistent with the Shockley diode equation. The spectrum near zero bias can be measured and characterized. It shows LED behavior that is substantially different from other typical measurements, and suggests a violation of Kirchhoff’s Law.
Highlights
This study was launched to demonstrate that LEDs at zero bias show recombination photon emissions, and to check the models for such recombination
Non-zero output would be a combination of thermally generated carrier pairs and diffusion of the higher-energy electrons from n-type to active region
We find a carrier recombination temperature which is the active region and cause photon emissions
Summary
This study was launched to demonstrate that LEDs at zero bias show recombination photon emissions, and to check the models for such recombination. LED photon emission near zero bias was explored. Others [1,2,3,4,5] have explored low voltage LED emissions approaching zero bias using similar apparatus. The above calculations say that generation continues through zero bias (the −1 term), as does recombination (the exponential term). Non-zero output would be a combination of thermally generated carrier pairs and diffusion of. Non-zero output would be a combination of thermally generated carrier pairs and diffusion of the higher-energy electrons from n-type to active region. The electrons subsequently recombine in the active region and cause photon emissions. We find a carrier recombination temperature which is the active region and cause photon emissions. The spectrum near 0 V suggests a violation of Kirchhoff’s Law
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