Creation and Function of Redox-Responsible Open-shell Chemical Species with Highly Emissive Properties

2016 Fiscal Year Final Research Report

• Project Area: Stimuli-responsive Chemical Species for the Creation of Functional Molecules
• Project/Area Number: 24109009
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Osaka Prefecture University
• Principal Investigator: Ikeda Hiroshi 大阪府立大学, 工学(系)研究科(研究院), 教授 (30211717)
• Co-Investigator(Kenkyū-buntansha): 松井 康哲 大阪府立大学, 工学(系)研究科(研究院), 助教 (90709586)
• Co-Investigator(Renkei-kenkyūsha): OHTA Eisuke 大阪府立大学, 工学研究科, 助教 (20550320)
• Research Collaborator: KANO Yusuke ; SAKAI Atsushi ; YAMAMOTO Atsushi ; OGAKI Takuya ; TANAKA Mirai ; KURAMOTO Yutaro
• Project Period (FY): 2012-06-28 – 2017-03-31
• Keywords: ビラジカル / ラジカルカチオン / 発光 / 励起状態 / 三重項―三重項蛍光 / 固体 / 光化学 / 反応機構

Outline of Final Research Achievements

In this study, we handled an excited triplet trimethylenemethane (TMM) as an example of a redox-responsible open-shell chemical species with highly emissive properties. This chemical species is generated in an organic light-emitting diodes whose light-emitting layer was doped with a methylenecyclopropane (MCP) derivative, and functions as a light-emitting element. We named it "organic radical light-emitting diodes". We also studied another MCP and found an adiabatic bond cleavage reaction where its excited triplet state directly give the excited triplet TMM. This reaction is followed by luminescence phenomenon and thus we named it "the excited state C-C bond cleavage-luminescence". Besides, we have obtained important insights into the emissive properties of open-shell chemical species, for example, an efficient upconversion by intramolecular triplet-triplet annihilation and a discovery of a novel luminescent species "excited multimer" in crystal.

Free Research Field

有機化学