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DESCRIPTION:Abstract:\n\nThe design of high-performance\, multifunctional o
 rganic emitters is pivotal for advancing technologies in optoelectronics\,
  sensing\, and bio-imaging. Heavy-metal-free organic materials that effici
 ently 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 do
 nor-acceptor (D–A) -conjugated systems are promising for thermally activa
 ted delayed fluorescence (TADF)\, as they spatially separate HOMO and LUMO
  to reduce singlet-triplet energy gaps\, thereby accelerating reverse inte
 rsystem crossing.  \n\nIn 2014\, we achieved a synthetic breakthrough via 
 an oxidative skeletal rearrangement of binaphthalene diamines (BINAMs)\, l
 eading to the previously inaccessible dibenzo[a\,j]phenazines (DBPHZ) scaf
 fold. Leveraging the unique structure and physicochemical properties of DB
 PHZ\, we designed and synthesized novel DBPHZ-cored emitters\, including t
 wisted D–A–D triads and D–A–D–A macrocycles. These emitters exhibit advanc
 ed photophysical functionalities—efficient TADF\, multi-color-mechanochrom
 ic luminescence\, and room-temperature phosphorescence (RTP). \n\nThis pre
 sentation will cover key publications including:  \n\n1) Chem. Commun. 201
 4\, 50\, 10291\; 2) Angew. Chem.\, Int. Ed. 2016\, 55\, 5739\; 3) Chem. Sc
 i. 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. Mat
 er. Interfaces 2021\, 13\, 2899\; 8) Angew. Chem.\, Int. Ed. 2024\, 63\, e
 202405158\; 9) Acc. Chem. Res. 2024\, 57\, 2219\; 10) ChemRxiv doi: 10.264
 34/chemrxiv-2025-sfp9s. \n\nAcknowledgements  \n\nParts of this research w
 ere 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
 .  \n\n \n\nBio:\n\nYouhei Takeda is an Associate Professor at Osaka Unive
 rsity. Youhei earned his B.Eng. from Waseda University in 2005\, followed 
 by his Ph.D. from Kyoto University in 2010 under the guidance of Professor
  Tamejiro Hiyama. He then conducted postdoctoral research at Massachusetts
  Institute of Technology (MIT) with Professor Timothy M. Swager\, during w
 hich\, he was appointed as JSPS research fellow (DC2 and PD). In 2011\, he
  joined Osaka University as an Assistant Professor and was promoted to Ass
 ociate Professor in 2015. His achievements have been widely recognized\, r
 eceiving several prestigious awards\, including the Incentive Award in Syn
 thetic Organic Chemistry\, Japan (2019)\, The Young Scientists’ Prize from
  the MEXT (2020)\, The Nozoe Memorial Award for Young Organic Chemists (20
 20)\, Thieme Chemistry Journals Award (2021)\, and Asian Core Program Lect
 ureship Award (2023). His research focuses on the innovative design and sy
 nthesis of heteroatom-embedded exotic π-conjugated organic molecules\, wit
 h applications spanning various interdisciplinary fields. \n
DTSTART:20251111T180000Z
DTEND:20251111T193000Z
LOCATION:OM 10\, Maass Chemistry Building\, CA\, QC\, Montreal\, H3A 0B8\, 
 801 rue Sherbrooke Ouest
SUMMARY:Chemical Society Seminar: Youhei Takeda-Triplet-Harvesting Organic 
 Emitters Based on a Dibenzo[a\,j]phenazine Core: From Novel Synthesis to M
 ultifunctional Applications 
URL:https://www.mcgill.ca/chemistry/channels/event/chemical-society-seminar
 -youhei-takeda-triplet-harvesting-organic-emitters-based-dibenzoajphenazin
 e-368780
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