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Related Concept Videos

P-N junction01:11

P-N junction

762
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...
762
Biasing of P-N Junction01:16

Biasing of P-N Junction

1.1K
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...
1.1K

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Related Experiment Video

Updated: Oct 21, 2025

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Efficient Perovskite White Light-Emitting Diode Based on an Interfacial Charge-Confinement Structure.

Zhiqiang Guan1,2, Yang Li1,2, Zhaohua Zhu1,2

  • 1Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR 999077, P. R. China.

ACS Applied Materials & Interfaces
|September 7, 2021
PubMed
Summary

Researchers developed efficient perovskite-based white light-emitting diodes (Pe-WLEDs) using a novel charge-confinement structure. This innovation enhances energy transfer, enabling stable white light for displays and tunable colors for lighting applications.

Keywords:
charge-confinement structurecolor tunableenergy transferperovskitetrapping effectwhite light-emitting diode

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid-State Physics

Background:

  • Perovskite light-emitting diodes (LEDs) offer promising next-generation lighting and display technology.
  • Research on single-color perovskite devices is extensive, but perovskite-based white LEDs (Pe-WLEDs) remain underexplored.

Purpose of the Study:

  • To develop an efficient perovskite-based white LED (Pe-WLED) by addressing energy transfer inefficiencies.
  • To achieve stable white light emission for display applications and tunable colors for lighting.

Main Methods:

  • Fabrication of a Pe-WLED using a blue perovskite and an orange phosphorescent emitter in a bilayer structure.
  • Introduction of a quantum-well-like charge-confinement structure to enhance carrier trapping and exciton formation.
  • Tuning the dopant concentration of the phosphorescent emitter.

Main Results:

  • Identified inefficient energy transfer in simple bilayer structures, causing low efficiency and color shift.
  • Achieved a high external quantum efficiency of 10.81% with the charge-confinement structure.
  • Demonstrated controllable stable white light and tunable color output by adjusting dopant concentration.

Conclusions:

  • The quantum-well-like charge-confinement structure effectively enhances energy transfer and carrier confinement in Pe-WLEDs.
  • This approach enables the development of efficient and stable Pe-WLEDs for both display and lighting applications.
  • Dopant concentration tuning offers a simple method for achieving desired white light characteristics.