Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 21, Pages 25186-25192Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c04779
Keywords
[2.2]paracyclophane; TADF; CP-OLED; circular polarized electroluminescence; chiral donor
Funding
- National NSF of China [21772086]
- NSF of Jiangsu Province [BK20181254]
- Fundamental Research Funds for the Central Universities
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The work describes the construction of a novel planar chiral [2.2]paracyclophane-based TADF-active molecule with CPL, which exhibits highly efficient luminescence performances and excellent CPL properties. The enantiomers show excellent TADF activities and the molecule has a small energy difference between singlet and triplet states. Additionally, a solution-processed yellow CP-OLEDs based on the molecule demonstrates high brightness, external quantum efficiency, and CPL signal.
This work describes the construction of a novel planar chiral [2.2]paracyclophane-based thermally activated delayed fluorescence (TADF)-active molecule with circularly polarized luminescence (CPL). The combination of the bulky planar chiral phenoxazinephane (PXZp) donor based [2.2]paracyclophane and triazine acceptor enables the highly efficient luminescence performances and excellent CPL properties. The enantiomers exhibit excellent TADF activities, the energy difference (Delta E-ST) between singlet and triplet of the molecule is only 0.03 eV. Notably, through solution-process, a yellow CP-OLEDs based on the molecule as the emitting layers displays high maximum brightness (L-max) up to 34 293 cd m(-2), maximum external quantum efficiency (EQE(max)) up to 7.8% and remarkable CP-EL signal with g(EL) factor up to 4.6 x 10(-3).
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