Maximizing Chiral Perturbation on Thermally Activated Delayed Fluorescence Emitters and Elaboration of the First Top‐Emission Circularly Polarized OLED

Lucas Frédéric (1) , Alaric Desmarchelier (1) , Romain Plais (1) , Leonid Lavnevich (1) , Gilles Muller (2) , Cassie Villafuerte (2) , Gilles Clavier (3) , Etienne Quesnel (4) , Benoit Racine (4) , Sylvia Meunier‐della‐gatta (4) , Jean‐pierre Dognon (5) , Pierre Thuéry (6) , Jeanne Crassous (7) , Ludovic Favereau (7) , Grégory Pieters (1)

1 SCBM - Service de Chimie Bio-Organique et de Marquage
2 Department of Chemistry [San José]
3 PPSM - Photophysique et Photochimie Supramoléculaires et Macromoléculaires
4 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information
5 LSDRM - Laboratoire Structure et Dynamique par Résonance Magnétique (LCF)
6 LCMCE - Laboratoire de Chimie Moléculaire et de Catalyse pour l'Energie (ex LCCEF)
7 ISCR - Institut des Sciences Chimiques de Rennes

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.

Keywords: Thermally Activated Delayed Fluorescence; Circularly Polarized Luminescence; Aggregation induced emission; OLED

Domains: Chemical Sciences; Material chemistry; Chemical Sciences; Theoretical and/or physical chemistry

Lucas Frédéric, Alaric Desmarchelier, Romain Plais, Leonid Lavnevich, Gilles Muller, et al.. Maximizing Chiral Perturbation on Thermally Activated Delayed Fluorescence Emitters and Elaboration of the First Top‐Emission Circularly Polarized OLED. Advanced Functional Materials, 2020, 30 (43), ⟨10.1002/adfm.202004838⟩. ⟨cea-02919912⟩