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Thermal Cross-linked Electron Transport Polymers for Suppressing Efficiency Roll-off in Green Solution-Processed

Ki Tae Kang¹, Jaekyum Kim², Thi Na Le¹

¹Organic Electronic Materials Laboratory, Department of Information Display, College of Sciences, Kyung Hee University, Seoul 02447, Republic of Korea.

ACS Applied Materials & Interfaces

|September 10, 2025

Summary

Researchers developed a new copolymer for solution-processed inverted organic light-emitting diodes (s-IOLEDs). This material enhances device efficiency and reduces performance loss by suppressing exciton dissociation at interfaces.

Keywords:

cross-linked electron transport polymer efficiency roll-off interface mixing recombination zone solution-processed inverted OLEDs

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Area of Science:

Organic electronics
Materials science
Device physics

Background:

Solution-processed inverted organic light-emitting diodes (s-IOLEDs) offer stability and high performance.
Common inorganic electron transport layers cause exciton dissociation, reducing efficiency and causing roll-off.

Purpose of the Study:

To design a novel cross-linkable electron transport copolymer for s-IOLEDs.
To suppress exciton dissociation and improve device efficiency and stability.

Main Methods:

Synthesized a triazine-grafted electron transport copolymer (PPDPT-co-PBCB) with high triplet energy (3.11 eV).
Varied the ratios of PPDPT and PBCB (9:1 and 8:2) to balance electron transport and cross-linkability.
Fabricated s-IOLEDs using the developed copolymer and analyzed device performance.

Main Results:

The s-IOLED with PPDPT-co-PBCB (8:2) achieved high current efficiency (59.85 cd A⁻¹) and external quantum efficiency (EQE) of 16.17%.
Minimal efficiency roll-off (1.05%) was observed at 5000 cd/m² luminance.
Analysis indicated a broad recombination zone, weak triplet-triplet annihilation, and narrow interfacial mixing width.

Conclusions:

The designed PPDPT-co-PBCB copolymer effectively suppresses exciton dissociation in s-IOLEDs.
Optimized copolymer composition enhances device efficiency and reduces roll-off.
This work provides a promising strategy for developing high-performance s-IOLEDs.