Date/Time Date(s) - 13/11/20251:30 pm - 2:20 pm
Title: Triplet-Harvesting Organic Emitters Based on a Dibenzo[a,j]phenazine Core:
From Novel Synthesis to Multifunctional Applications
Date: Thursday November 13, 2025
Time: 1:30pm-2:30pm
Room: ABB 165
Host: Dr. Alex Adronov
Abstract:
The design of high-performance, multifunctional organic emitters is pivotal for advancing technologies in optoelectronics, sensing, and bio-imaging. Heavy-metal-free organic materials that efficiently harvest triplet excitons and converting them into light are emerging as next-generation candidates for high-efficiency organic light-emitting diodes (OLEDs) From a materials-design standpoint, twisted or resonant donor-acceptor (D–A) p-conjugated systems are promising for thermally activated delayed fluorescence (TADF), as they spatially separate HOMO and LUMO to reduce singlet-triplet energy gaps, thereby accelerating reverse intersystem crossing.
In 2014, we achieved a synthetic breakthrough via an oxidative skeletal rearrangement of binaphthalene diamines (BINAMs), leading to the previously inaccessible dibenzo[a,j]phenazines (DBPHZ) scaffold. Leveraging the unique structure and physicochemical properties of DBPHZ, we designed and synthesized novel DBPHZ-cored emitters, including twisted D–A–D triads and D–A–D–A macrocycles. These emitters exhibit advanced photophysical functionalities—efficient TADF, multi-color-mechanochromic luminescence, and room-temperature phosphorescence (RTP).
This presentation will cover key publications including:
1) Chem. Commun. 2014, 50, 10291; 2) Angew. Chem., Int. Ed. 2016, 55, 5739; 3) Chem. Sci. 2017, 8, 2677; 4) Chem. Commun. 2018, 54, 6847; 5) Commun. Chem. 2020, 3, 118; 6) J. Am. Chem. Soc. 2020, 142, 1482; 7) ACS Appl. Mater. Interfaces 2021, 13, 2899; 8) Angew. Chem., Int. Ed. 2024, 63, e202405158; 9) Acc. Chem. Res. 2024, 57, 2219; 10) ChemRxiv doi: 10.26434/chemrxiv-2025-sfp9s.
Acknowledgements
Parts of this research were supported by the JST ASPIRE program (Adopting Sustainable Partnerships for Innovative Research Ecosystem; Grant No. JPMJAP2424), which aims to foster international collaboration and advance Japan’s research ecosystem.