Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202004838
Keywords
aggregation induced emission; circularly polarized luminescence; OLED; thermally activated delayed fluorescence
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Funding
- SCBM
- Labex CHARMMMAT [ANR-11-LABX-0039]
- Programme Transverse de Competences du CEA (POLEM project)
- ANR (iChiralight project) [ANR-19-CE07-0040]
- NIH, Minority Biomedical Research Support [1SC3GM089589-08]
- Henry Dreyfus Teacher-Scholar Award
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Molecular designs merging circularly polarized luminescence (CPL) and thermally activated delayed fluorescence (CP-TADF) using the concept of chiral perturbation appeared recently as a cornerstone for the development of efficient CP-organic light emitting diodes (CP-OLED). Such devices could strongly increase the energy efficiency and performances of conventional OLED displays, in which 50% of the emitted light is often lost due to the use of antiglare filters. In this context, herein, ten couples of enantiomers derived from novel chiral emitter designs are reported, exhibiting CPL, TADF, and aggregation induced enhancement emission properties (AIEE). Representing the first structure properties relationship investigation for CP-TADF materials, this thorough experimental and theoretical work brings crucial findings on the key structural and electronic parameters (isomerism, nature of the carbazole substituents) governing the synergy between CPL and TADF properties. To conclude this study, the first top emission CP-OLED is elaborated as a new approach of generating CP light in comparison with classical bottom-emission CP-OLED architecture. Indeed, the top-emission configuration represents the only relevant device architecture for future microdisplay applications. Thereby, in addition to offer molecular guidelines to combine efficiently TADF and CPL properties, this study opens new avenues toward practical applications for CP-OLEDs.
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