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Related Concept Videos

P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
Biasing of P-N Junction01:16

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Related Experiment Video

Updated: May 23, 2026

Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
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Thermoelectrically pumped light-emitting diodes operating above unity efficiency.

Parthiban Santhanam1, Dodd Joseph Gray, Rajeev J Ram

  • 1Research Lab of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|April 3, 2012
PubMed
Summary
This summary is machine-generated.

This study reveals semiconductor diodes use electrical work to transfer heat to photons at low voltage. Device efficiency inversely scales with output power, exceeding prior efficiency limits.

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Area of Science:

  • Solid State Physics
  • Semiconductor Devices
  • Optoelectronics

Background:

  • Semiconductor light-emitting diodes (LEDs) are crucial optoelectronic devices.
  • Understanding LED efficiency is vital for energy-saving technologies.
  • Conventional limits on LED power conversion efficiency are well-established.

Purpose of the Study:

  • To investigate the thermodynamic behavior of semiconductor LEDs at low forward bias.
  • To analyze the impact of radiative and nonradiative recombination on efficiency.
  • To explore efficiency limits beyond the conventional unity power conversion.

Main Methods:

  • Theoretical analysis of a heated semiconductor diode at low forward bias voltage (V < kBT/q).
  • Modeling of radiative and nonradiative recombination rates as a function of V.
  • Experimental verification of predicted efficiency behavior.

Main Results:

  • Electrical work is used to pump heat from the lattice to the photon field.
  • Both radiative and nonradiative recombination contribute linearly to V.
  • Device wall-plug efficiency is inversely proportional to output power, diverging as V approaches zero.
  • Experimental results confirm this behavior extends beyond unity efficiency.

Conclusions:

  • The study demonstrates a novel heat-pumping mechanism in semiconductor LEDs.
  • Efficiency limitations are fundamentally linked to thermodynamic processes at low bias.
  • Findings challenge and extend the understanding of LED power conversion efficiency.