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2018 Fiscal Year Final Research Report

Molecular-level study and control of cooperative photoresponse of molecular complexes

Planned Research

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Project AreaApplication of Cooperative-Excitation into Innovative Molecular Systems with High-Order Photo-functions
Project/Area Number 26107014
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionTokyo Institute of Technology

Principal Investigator

VACHA Martin  東京工業大学, 物質理工学院, 教授 (50361746)

Co-Investigator(Kenkyū-buntansha) 平田 修造  電気通信大学, 大学院情報理工学研究科, 助教 (20552227)
Project Period (FY) 2014-07-10 – 2019-03-31
Keywords1分子科学
Outline of Final Research Achievements

Using single-molecule spectroscopy we studied and controlled the photoresponse of molecular complexes, such as aggregates, molecular crystals and conjugated polymers, as well as their semiconducting counterparts, such as quantum dots, and hybrid systems composed of noble metal nanoparticles and organic dyes. The results include conformational and spectroscopic characterization of poly(phenylene vinylene) and polyfluorene conjugated polymers, origin and suppression of defect emission and characterization of band-edge emission in I-III-IV semiconductor quantum dots, characterization of blinking, emission quantum efficiency and electroluminescence in halide perovskite nanocrystals, effect of enhancement of resonant energy transfer between organic dyes by localized plasmons and study of triplet exciton diffusion, phosphorescence and of triple-triplet annihilation and photon upconversion in molecular solids.

Free Research Field

有機材料ナノスケール特性

Academic Significance and Societal Importance of the Research Achievements

ポリフルオレンの緑発光の起源が凝集構造に由来することの発見は、従来考えられていたメカニズムを塗り替えるものである。また局在プラズモンによるエネルギー移動の増強や制御は、エネルギー移動距離の更なる向上を期待させるものである。さらに三重項励起子拡散に関する成果は、長寿命発光や低閾値光アップコンバージョンの特性向上に対して重要な知見をもたらすものとなる。
I-III-IV属半導体量子ドットにおける複数の欠陥サイトの発見やペロブスカイトナノ結晶のブリンキングの起源の発見は、既存の量子ドットディスプレイに使われているCd系量子ドット発光体の代替材料を見出していくための重要な知見であり社会的にも重要である。

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Published: 2020-03-30  

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