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High efficiency in a solution-processed thermally activated delayed-fluorescence device using a delayed-fluorescence

Yong Joo Cho¹, Kyoung Soo Yook, Jun Yeob Lee

¹Department of Polymer Science and Engineering, Dankook University, 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi, 448-701, Korea.

Advanced Materials (Deerfield Beach, Fla.)

|September 3, 2014

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Researchers enhanced a common delayed fluorescence emitter with a tert-butyl substituent. This modification achieved over 18% quantum efficiency in a solution-processed device.

Area of Science:

Organic electronics
Photophysics
Materials science

Background:

Thermally activated delayed fluorescence (TADF) materials are crucial for efficient organic light-emitting diodes (OLEDs).
Solution-processing offers a cost-effective alternative to vacuum deposition for fabricating OLED devices.
Tuning molecular structure is key to optimizing the photophysical properties of TADF emitters.

Purpose of the Study:

To investigate the impact of tert-butyl substitution on the performance of a TADF emitter.
To achieve high quantum efficiency in a solution-processed TADF device.

Main Methods:

Synthesis of a modified TADF emitter incorporating a tert-butyl substituent.
Fabrication of OLED devices using the modified emitter via solution processing.

Keywords:

green devices quantum efficiency solution devices thermally activated delayed-fluorescence

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Characterization of the photophysical properties and device performance, including quantum efficiency.

Main Results:

The modified TADF emitter exhibited excellent photophysical properties.
A high external quantum efficiency exceeding 18% was achieved in the solution-processed device.
The tert-butyl substituent effectively improved the performance of the TADF material.

Conclusions:

Molecular modification of TADF emitters with tert-butyl groups is a viable strategy for enhancing device efficiency.
Solution-processed TADF devices can achieve high performance comparable to vacuum-processed counterparts.
This work contributes to the development of efficient and cost-effective organic electronic devices.