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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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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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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Related Experiment Video

Updated: Dec 11, 2025

Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
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Highly Efficient Inverted Circularly Polarized Organic Light-Emitting Diodes.

Li Wan1, Jessica Wade1,2, Xingyuan Shi1,2

  • 1Department of Physics and Centre for Processable Electronics, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.

ACS Applied Materials & Interfaces
|August 19, 2020
PubMed
Summary

Researchers developed a new inverted device architecture for polymer light-emitting diodes (PLEDs) to achieve efficient circularly polarized (CP) electroluminescence. This breakthrough overcomes previous limitations, enabling high performance and dissymmetry in CP-PLEDs for advanced display technologies.

Keywords:
chiral materialscircular polarizationdevice architectureinverted light-emitting diodeslight-emitting polymers

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photonics

Background:

  • Circularly polarized (CP) electroluminescence is a promising strategy for enhancing organic light-emitting diode (OLED) display performance.
  • Existing CP-OLEDs, including small-molecule and polymer variants (SM-OLEDs and PLEDs), often exhibit low dissymmetry factors (g-factor < 0.1) and suboptimal device performance.
  • Achieving both high efficiency and high dissymmetry in CP-PLEDs has been a significant challenge.

Purpose of the Study:

  • To demonstrate the first CP-PLED utilizing an inverted device architecture.
  • To achieve high efficiency and high dissymmetry in CP-PLEDs simultaneously.
  • To explore the influence of device architecture on CP emission handedness.

Main Methods:

  • Fabrication of a novel inverted device architecture for CP-PLEDs.
  • Characterization of device performance, including current efficiency, power efficiency, and maximum luminance.
  • Measurement of electroluminescence dissymmetry factor (gEL) to quantify CP emission.

Main Results:

  • Demonstrated the first CP-PLED with an inverted architecture, achieving a current efficiency of 16.4 cd/A and a power efficiency of 16.6 lm/W.
  • Attained a high EL dissymmetry factor (gEL) of 0.57 and a maximum luminance exceeding 28,500 cd/m².
  • Observed that the handedness of CP-EL emission is sensitive to the PLED device architecture, with an observed reversal between inverted and conventional devices.

Conclusions:

  • The inverted device architecture is a viable strategy for realizing highly efficient and highly dissymmetric CP-PLEDs.
  • Device architecture and internal electric field are critical, previously unexplored factors for controlling CP emission handedness.
  • These findings expand the applicability of CP emissive devices in various CP-dependent technologies.