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Related Concept Videos

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...
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
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...
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...

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Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
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Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter

Published on: November 7, 2025

Focus Issue: Organic light-emitting diodes-status quo and current developments.

Emil J W List1, Norbert Koch

  • 1NanoTecCenter Weiz Forschungsgesellschaft m.b.H., Franz-Pichler-Straße 32, A-8160 Weiz, Austria. e.list@tugraz.at

Optics Express
|November 24, 2011
PubMed
Summary

This focus issue highlights advancements in organic light-emitting diodes (OLEDs). It addresses key challenges in light outcoupling and management for improved OLED performance.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Introduction to the Optics Express Energy Express supplement Focus Issue on Organic Light-Emitting Diodes (OLEDs).
  • Highlights the critical role of OLED technology in energy-efficient lighting and displays.

Discussion:

  • Focuses on the technical challenges in enhancing light outcoupling efficiency in OLED devices.
  • Explores strategies for effective light management within OLED structures to minimize losses.

Key Insights:

  • Presents six invited articles offering expert perspectives on OLED advancements.
  • Addresses the need for innovative solutions to overcome current limitations in OLED performance.

Outlook:

  • Discusses future directions and research priorities in the field of organic light-emitting diodes.
  • Emphasizes the potential for further development in OLED technology for diverse applications.