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Related Experiment Video

Updated: Aug 14, 2025

Development of Efficient OLEDs from Solution Deposition

Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

Binaphthol-based chiral host molecules for efficient solution-processed circularly polarized OLEDs.

Qiwei Dong^1,2, Chen Xiao¹, Binghong He¹

¹Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, School of Materials Science & Engineering, Changzhou University, Changzhou 213164, China. zhuwg18@126.com.

Chemical Communications (Cambridge, England)

|January 18, 2023

Summary

This summary is machine-generated.

New chiral hosts enable solution-processed circularly polarized organic light-emitting diodes (CP-OLEDs). These devices achieve high external quantum efficiency (EQE) and dissymmetry factors (gEL), paving the way for advanced display technologies.

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Area of Science:

Materials Science
Organic Electronics
Photochemistry

Background:

Chiral materials are crucial for developing circularly polarized organic light-emitting diodes (CP-OLEDs).
Solution processability is highly desirable for cost-effective manufacturing of OLED devices.
Achiral emitters can be utilized in CP-OLEDs when paired with appropriate chiral hosts.

Purpose of the Study:

To synthesize and characterize novel chiral hosts for solution-processed CP-OLEDs.
To investigate the performance of CP-OLEDs utilizing these chiral hosts with achiral emitters.
To evaluate the external quantum efficiency (EQE) and electroluminescent dissymmetry factor (gEL) of the fabricated devices.

Main Methods:

Synthesis of two chiral hosts: (R/S)-BN-mCP and (R/S)-BN-2mCP.
Fabrication of solution-processed CP-OLED devices using the synthesized chiral hosts and achiral emitters (e.g., Ir(mypp)3, Ir(piq)2(acac)).
Characterization of device performance, including EQEmax and gEL measurements.

Main Results:

CP-OLEDs based on (R/S)-BN-mCP and (R/S)-BN-2mCP with achiral emitter Ir(mypp)3 achieved maximum external quantum efficiencies (EQEmax) of 12.7% and 17.1%, respectively.
Dissymmetry factor (gEL) values reached -1.7 × 10^-3 and -1.3 × 10^-3 for devices using (R/S)-BN-mCP and (R/S)-BN-2mCP, respectively.
A solution-processed OLED using (R)-BN-2mCP as the chiral host and a combination of Ir(mypp)3 and Ir(piq)2(acac) emitters exhibited a broad emission spectrum with EQEmax of 12.1% and gEL of -1.1 × 10^-3.

Conclusions:

The developed chiral hosts, (R/S)-BN-mCP and (R/S)-BN-2mCP, are effective for creating high-performance solution-processed CP-OLEDs.
The use of achiral emitters with these chiral hosts enables efficient circularly polarized light emission.
These findings contribute to the advancement of solution-processable circularly polarized organic light-emitting diode technology.