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High-efficiency stretchable light-emitting polymers from thermally activated delayed fluorescence.

Wei Liu¹, Cheng Zhang¹, Riccardo Alessandri¹

¹Pritzker School of Molecular Engineering, The University of Chicago, Chicago, IL, USA.

Nature Materials

|April 6, 2023

Summary

Researchers developed stretchable light-emitting polymers using thermally activated delayed fluorescence (TADF) to achieve near-unity quantum yield. This breakthrough enables highly efficient, stretchable displays and optical devices.

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Area of Science:

Materials Science
Polymer Chemistry
Optoelectronics

Background:

Stretchable light-emitting materials are crucial for advanced applications like skin-like displays and optical biostimulation.
Existing stretchable emitters, typically electroluminescent polymers, are limited by harnessing only singlet excitons, capping theoretical quantum yield at 25%.

Purpose of the Study:

To design and synthesize stretchable electroluminescent polymers capable of harnessing all excitons via thermally activated delayed fluorescence (TADF).
To achieve near-unity theoretical quantum yield in stretchable light-emitting materials.

Main Methods:

Incorporating flexible, linear units into the polymer backbone to enhance mechanical stretchability.
Synthesizing novel TADF polymers with integrated stretchable units.
Fabricating and testing a fully stretchable organic light-emitting diode (OLED).

Main Results:

Achieved a polymer stretchability of 125%.
Demonstrated an external quantum efficiency (EQE) of 10% in the synthesized polymer.
Successfully created a fully stretchable OLED device.

Conclusions:

The proposed design strategy effectively imparts stretchability to electroluminescent polymers without compromising their optical properties.
Stretchable TADF polymers offer a promising route to simultaneously achieve high efficiency, brightness, switching speed, and mechanical flexibility in optoelectronic devices.
This work paves the way for next-generation stretchable displays and optical stimulation technologies.