Innovative Chiral Molecules for the Construction of Efficient Circularly Polarized Light Emitting Devices – iChiralight

Since the start of the project several molecular designs for combining CPL and TADF have been explored. In each case, a structure/property study has been undertaken to understand the structural parameters influencing the magnitude of the photophysical and chiroptical properties. New approaches to generating polarised electroluminescence were also investigated.

1) First structure/property study for CP-TADF compounds based on the concept of chiral perturbation
2) First CP-OLED «top-emission« TADF
3) Enhancement of the chiroptical properties of [6]-carbohelicene derivatives and applications as emitters in top emission CP-OLEDs
4) Discovery of a new molecular design to combine CPL, TADF and AIEE properties
5) Development of a new CP-OLED design strategy
6) Review on the design and applications of CP-TADF molecules

Based on the initial results, new molecular designs and approaches to combine CPL and TADF properties are being developed.

1) Adv. Funct. Mater. 2020, 2004838

2) Chem. Sci. 2021, Advance Article, doi.org/10.1039/D0SC06895K

3) Adv. Funct. Mater. 2021, 2010281

4) Circularly polarized OLED emitting layer composition: N° de dépôt : FR2011121

5) Composés organiques à émission de fluorescence retardée et de lumière circulairement polarisée et leur utilisation N° de dépôt : FR2007467

The development of Circularly Polarized Organic Light Emitting Diodes (CP-OLED) based on chiral emitter has received renewed attention as a potential direction for increasing the energy efficiency and the contrast of conventional OLED displays. However, combining both high electroluminescence circular polarization and device performances has never been done so far and remains a considerable challenge for potential optoelectronic applications. Recently, the development of Thermally Activated Delayed Fluorescence (TADF) emitters has recently enhanced the efficiency of non-polarized OLED by converting both singlet and triplet excitons for light emission. In this context, the main objective of this multidisciplinary project is to design novel chiral TADF molecules (organic, organometallic) and incorporate them as emissive dopant in CP-OLED devices displaying high degrees of both electroluminescence polarization and efficiency.