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Room-Temperature Multiple Phosphorescence from Functionalized Corannulenes: Temperature Sensing and Afterglow Organic
Changfeng Si1, Tao Wang1, Abhishek Kumar Gupta1
1Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, St. Andrews, KY16 9ST, UK.
Angewandte Chemie (International Ed. in English)
|September 1, 2023
Summary
New corannulene materials enable efficient light emission for sensors and organic light-emitting diodes (OLEDs). Researchers developed multi-donor-acceptor molecules exhibiting tunable phosphorescence for advanced temperature sensing and high-performance afterglow OLEDs.
Area of Science:
- Materials Science
- Organic Electronics
- Photophysics
Background:
- Corannulene derivatives are known for energy storage and solar cells but underexplored as emitters in light-emitting sensors and OLEDs due to low exciton utilization.
- Developing efficient emitters is crucial for advancing organic light-emitting diodes (OLEDs) and light-emitting sensing technologies.
Purpose of the Study:
- To design and synthesize novel corannulene-based multi-donor-acceptor (multi-D-A) materials for light-emitting applications.
- To investigate the photophysical properties, including room-temperature phosphorescence (RTP), of these new materials.
- To explore their potential in high-resolution temperature sensing and solution-processed afterglow OLEDs.
Main Methods:
- Synthesis of multi-D-A corannulene derivatives: TCzPhCor, TDMACPhCor, and TPXZPhCor, utilizing corannulene as the acceptor and carbazole, DMAC, or PXZ as donors.
- Theoretical and photophysical investigations, including analysis of triplet states (T1) and their energies.
- Device fabrication and characterization of solution-processed afterglow OLEDs and temperature sensing applications.
Main Results:
- Achieved tunable phosphorescence in corannulene derivatives, with TCzPhCor showing RTP from the lowest T1, TDMACPhCor exhibiting dual RTP from higher (T1H) and lower (T1L) triplet states, and TPXZPhCor displaying T1H-dominated RTP.
- Demonstrated high color-resolution temperature sensing utilizing the temperature sensitivity of TPXZPhCor.
- Fabricated the first corannulene-based solution-processed afterglow OLEDs using TPXZPhCor, achieving a maximum external quantum efficiency (EQEmax) of 3.3% and luminance (Lmax) of 5167 cd/m², positioning it among the most efficient RTP OLEDs.
Conclusions:
- The developed multi-D-A corannulene motifs offer versatile platforms for achieving tunable phosphorescence.
- TPXZPhCor demonstrates significant potential for high-performance temperature sensing and efficient afterglow OLED applications.
- This work expands the application scope of corannulene derivatives into advanced light-emitting technologies.
Keywords:
Afterglow Organic Light-Emitting DiodeCorannuleneMultiple PhosphorescenceRoom-Temperature PhosphorescenceTemperature SensingMore Related Videos
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