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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

971
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...
971

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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Circularly Polarized Near-Infrared Electroluminescence from Chromium(III) Complex-Based OLEDs.

Maxime Poncet1, Juan-Ramón Jiménez2, Francesco Zinna3

  • 1Department of Inorganic and Analytical Chemistry, University of Geneva, 30 quai Ernest Ansermet, Geneva 4, CH-1211, Switzerland.

Small (Weinheim an Der Bergstrasse, Germany)
|November 19, 2025
PubMed
Summary

This study introduces chromium(III) complexes for organic light-emitting diodes, achieving near-infrared circularly polarized electroluminescence. These earth-abundant materials offer potential for advanced chiral optoelectronics.

Keywords:
CPLCP‐NIR‐OLEDschromiumelectroluminescencespin‐flip

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Chiroptical Spectroscopy

Background:

  • Organic light-emitting diodes (OLEDs) with circularly polarized (CP) electroluminescence (EL) are crucial for advanced displays and photonic technologies.
  • Chiral organic molecules and 4d/5d metal complexes are typically used in the emissive layers of such devices.

Purpose of the Study:

  • To demonstrate electroluminescence from a chromium(III) complex for CP EL applications.
  • To explore the potential of earth-abundant chromium complexes in chiral optoelectronics.

Main Methods:

  • Utilized enantiopure chromium(III) complexes with highly polarized spin-flip transitions.
  • Fabricated a proof-of-concept device to showcase near-infrared (NIR) CP EL.

Main Results:

  • Achieved NIR CP EL emission with peaks at 726 and 747 nm.
  • Observed dissymmetry values of up to 0.015 and -0.029, demonstrating significant circular polarization.
  • Successfully demonstrated EL emission from a chromium(III) complex.

Conclusions:

  • Earth-abundant chromium(III) complexes are viable for creating CP EL devices.
  • These findings open avenues for chiral optoelectronic applications in medicine, security, and quantum communications.