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Published on: March 19, 2017
An effective orange-red solution-processed circularly polarized organic light-emitting diode.
Junqing Wang1, Xiaoyi Lai1, Yongzhi Zhou1,2
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. qiji830404@hotmail.com.
Researchers developed new circularly polarized thermally activated delayed fluorescence (CP-TADF) materials. These orange-red emitting materials exhibit strong chiroptical properties and enable efficient circularly polarized light emission in devices.
Area of Science:
- Organic electronics
- Materials science
- Photophysics
Background:
- Thermally activated delayed fluorescence (TADF) materials offer high efficiency in organic light-emitting diodes (OLEDs).
- Circularly polarized (CP) light emission is crucial for advanced display and 3D technologies.
- Integrating chirality into TADF emitters is challenging but desirable for CP-OLEDs.
Purpose of the Study:
- To synthesize and characterize novel circularly polarized thermally activated delayed fluorescence (CP-TADF) materials.
- To investigate the chiroptical properties and emission characteristics of these new materials.
- To fabricate and evaluate solution-processable CP-TADF devices.
Main Methods:
- Synthesis of enantiomerically pure (R)-ad-PXZ and (S)-ad-PXZ materials.
- Photophysical characterization including emission spectra and quantum yields.
- Chiroptical measurements in solution and solid state.
- Fabrication and testing of solution-processed OLED devices.
Main Results:
- Successful synthesis of (R)-ad-PXZ and (S)-ad-PXZ with orange-red emission at 602 nm.
- Observation of distinct chiroptical properties in both solution and solid states.
- Fabricated solution-processable device achieved a maximum external quantum efficiency of 9.0%.
- The device demonstrated a circularly polarized electroluminescence (CP-EL) performance with a gEL value of 10-3.
Conclusions:
- The developed CP-TADF materials exhibit promising photophysical and chiroptical properties.
- Solution-processable devices based on these materials show potential for efficient circularly polarized light emission.
- These findings contribute to the advancement of chiral optoelectronic materials and devices.
