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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: Jul 24, 2025

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
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Intrinsically Stretchable Phosphorescent Light-Emitting Materials for Stretchable Displays.

Je-Heon Oh1, Jin-Woo Park1

  • 1Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea.

ACS Applied Materials & Interfaces
|July 6, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed intrinsically stretchable phosphorescent light-emitting layers (isp-EMLs) for displays. This breakthrough enhances stretchability and efficiency in organic light-emitting diodes (OLEDs) using phosphorescent materials.

Keywords:
blendingintrinsically stretchable organic light-emitting diodephosphorescentplasticizerpolymer host

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Display Technology

Background:

  • Intrinsically stretchable organic light-emitting diodes (is-OLEDs) are crucial for next-generation displays.
  • Current stretchable OLEDs primarily use fluorescent materials with limited internal quantum efficiency (IQE) of 25%.
  • Phosphorescent materials offer a higher theoretical IQE (100%) but have not been developed for stretchable applications.

Purpose of the Study:

  • To design and develop a solution-processable and intrinsically stretchable phosphorescent light-emitting layer (isp-EML).
  • To enhance the mechanical and optoelectronic properties of phosphorescent OLEDs for improved performance and durability.

Main Methods:

  • A blend system was created using a polymer host (poly(9-vinyl carbazole), PVK) and a phosphorescent emitting dopant (tris(2-phenylpyridine)iridium(III), Ir(ppy)3).
  • Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (PEG-PPG-PEG) was used as an additive to improve material properties.
  • The isp-EML's performance was evaluated in terms of stretchability, brightness, and efficiency.

Main Results:

  • The developed isp-EML achieved significantly improved stretchability (∼100% strain) compared to conventional phosphorescent EMLs (∼3% strain).
  • Brightness increased to ∼5400 cd/m², and efficiency reached ∼25.3 cd/A, substantially outperforming conventional materials.
  • Tunable emission colors (red, green, blue) were achieved by altering the emitting dopant, maintaining enhanced mechanical and electrical properties.

Conclusions:

  • The novel blend system using phosphorescent materials and additives demonstrates high potential for creating highly stretchable and efficient OLEDs.
  • This work overcomes previous limitations by enabling stretchability in high-efficiency phosphorescent OLEDs.
  • The developed isp-EML technology paves the way for advanced, durable, and flexible display applications.