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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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Related Experiment Video

Updated: Apr 15, 2026

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
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Solid-State Red Carbon Quantum Frameworks With Narrowband Thermally Activated Delayed Fluorescence for Undoped LEDs

Xianzhi Song1, Linjuan Yang1, Runqing Fan1

  • 1College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing, China.

Angewandte Chemie (International Ed. in English)
|April 14, 2026
PubMed
Summary

Researchers developed solid-state red carbon quantum frameworks (SSR-CQFs) for narrowband thermally activated delayed fluorescence (TADF) in LEDs. These SSR-CQFs enable efficient, stable, and high-purity red emission in solution-processed, undoped devices.

Keywords:
carbon quantum frameworknarrowbandoperational stabilitysolid‐state red emittersundoped light‐emitting emitting diodes

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • High color purity and efficiency in red light-emitting diodes (LEDs) are crucial for advanced display technologies.
  • Solution-processable undoped emission layers offer an ideal architecture for enhanced LED operational lifetime and simplified fabrication.
  • Achieving narrowband emission in solid-state devices is challenging due to vibrational coupling and π-π stacking interactions.

Purpose of the Study:

  • To develop novel solid-state red carbon quantum frameworks (SSR-CQFs) for narrowband thermally activated delayed fluorescence (TADF).
  • To investigate the structural and photophysical properties of SSR-CQFs for high-performance, solution-processed, undoped LEDs.
  • To demonstrate the potential of SSR-CQFs in achieving high color purity, efficiency, and operational stability in red LEDs.

Main Methods:

  • Synthesis and characterization of solid-state red carbon quantum frameworks (SSR-CQFs).
  • Fabrication of solution-processed, undoped red LEDs utilizing SSR-CQFs as the emission layer.
  • Optical and electrical performance testing, including photoluminescence quantum yield (PLQY), emission spectra, external quantum efficiency (EQE), and operational stability.

Main Results:

  • SSR-CQFs exhibit narrowband TADF emission with a peak at 635 nm, a narrow full width at half maximum (FWHM) of 39 nm, and a high PLQY of 64% in neat films.
  • The unique undulating 2D framework of SSR-CQFs effectively confines π-electrons, suppresses charge-transfer states, and prevents π-π stacking, leading to superior optical properties.
  • Solution-processed undoped LEDs based on SSR-CQFs achieved high color purity (CIE: 0.658, 0.326), a maximum EQE of 8.04%, and excellent operational stability (T85 of 116 h).

Conclusions:

  • The designed SSR-CQFs provide a novel strategy for achieving solution-processable, undoped carbon-based LEDs.
  • This approach successfully combines narrowband emission, high efficiency, and robust operational stability, addressing key challenges in red LED technology.
  • SSR-CQFs represent a promising material platform for next-generation high-performance displays and lighting applications.