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Encapsulated TADF macrocycles for high-efficiency solution-processed and flexible organic light-emitting diodes
Xinxin Ban1,2, Qingpeng Cao1, Wenhao Zhang1
1School of Environmental and Chemical Engineering, Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, Jiangsu Ocean University Lianyungang Jiangsu China banxx@jou.edu.cn taocz@jou.edu.cn.
Chemical Science
|September 23, 2024
Summary
New macrocyclic emitters with flexible linkers enable high-efficiency, solution-processed organic light-emitting diodes (OLEDs). These advanced materials offer improved performance and flexibility for next-generation displays.
Area of Science:
- Organic electronics
- Materials science
- Photophysics
Background:
- Macrocyclic emitters are key for high-efficiency OLEDs but often limited by rigid structures.
- Existing designs struggle with solution-processability and flexibility.
Purpose of the Study:
- To design and synthesize novel macrocyclic TADF emitters with flexible linkers.
- To investigate the impact of flexible linkers and bulky wrapping units on emitter performance.
- To develop high-performance, solution-processed, and flexible OLEDs.
Main Methods:
- Synthesis of two macrocyclic TADF emitters: Cy-BNFu and CyEn-BNFu, featuring flexible alkyl chains and bulky aromatic hydrocarbon units.
- Detailed photophysical analysis including photoluminescence quantum yield (PLQY) measurements.
- Fabrication and testing of non-doped, solution-processed OLED devices.
Main Results:
- Flexible linkers enhanced solution-processability and emitter flexibility without compromising radiative transition or PLQY.
- The macrocyclic CyEn-BNFu effectively isolated the TADF core, suppressing aggregation-caused quenching.
- OLEDs based on CyEn-BNFu achieved a maximum external quantum efficiency (EQE) of 32.3%, a threefold increase over the parent molecule.
- Fabricated flexible OLEDs demonstrated superior brightness, color purity, and bending resistance.
Conclusions:
- Macrocyclic TADF emitters with flexible alkyl chain linkers offer a viable strategy for high-performance OLEDs.
- Encapsulated macrocycles are beneficial for optimizing flexible, solution-processed devices.
- This work paves the way for advanced flexible display technologies.
