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Updated: Jul 4, 2025

Development of Efficient OLEDs from Solution Deposition

Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

HLCT-Type Acceptor Molecule-Based Exciplex System for Highly Efficient Solution-Processable OLEDs with Suppressed

Yixiao Yin¹, Xiaoyi Lai¹, Qian Ma²

¹School of Materials Science & Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, Changzhou University, Changzhou, 213164, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|February 5, 2024

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Advanced materials (Deerfield Beach, Fla.)·2026

New exciplex molecules enable high-efficiency, low-roll-off organic light-emitting diodes (OLEDs) processed from solution. These thermally activated delayed fluorescence (TADF) materials achieve excellent performance, paving the way for advanced display technologies.

Area of Science:

Materials Science
Organic Electronics
Photophysics

Background:

Exciplex systems offer potential for high-efficiency organic light-emitting diodes (OLEDs) due to small energy differences between singlet and triplet states.
Achieving high efficiency and low roll-off in solution-processed OLEDs using exciplexes remains a significant challenge.

Purpose of the Study:

To design and synthesize novel exciplex-forming molecules for solution-processable OLEDs.
To investigate the thermally activated delayed fluorescence (TADF) characteristics and device performance of these new materials.

Main Methods:

Synthesis of two (HLCT)-type isomers, 2-tBuspoCz-TRZ and 10-tBuspoCz-TRZ, featuring a spiro skeleton with tert-butylspirofluorene indole as donor and triazine as acceptor.
Fabrication and characterization of solution-processable OLEDs and phosphorescent devices using the synthesized exciplexes as emitters or host matrices.

Keywords:

HLCT‐type acceptor exciplex system solution‐processable OLED synthesis and property

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Last Updated: Jul 4, 2025

Development of Efficient OLEDs from Solution Deposition

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Published on: November 4, 2022

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Main Results:

The synthesized exciplexes exhibit distinct TADF characteristics with a very small energy gap (ΔE_ST) of 35 ± 5 meV, leading to green emission.
Solution-processable OLEDs using the TADF exciplex system achieved a maximum external quantum efficiency (EQE_max) of 20.8%.
Solution-processable phosphorescent devices utilizing HLCT-based exciplexes as host matrices demonstrated high EQE_max > 25% with minimal efficiency roll-off (≈3.5% at 1000 cd m^-2).

Conclusions:

The study presents a novel strategy for designing acceptor exciplex molecules for effective TADF emitters.
These exciplexes serve as promising host matrices for high-performance, solution-processable phosphorescent OLEDs.
The developed materials address key challenges in achieving efficient and stable solution-processed OLEDs.