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2021 Fiscal Year Final Research Report

Characterization and improvement of current-injection organic semiconductor lasers

Research Project

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Project/Area Number 18H01852
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 29010:Applied physical properties-related
Research InstitutionTohoku University

Principal Investigator

Shimotani Hidekazu  東北大学, 理学研究科, 准教授 (60418613)

Project Period (FY) 2018-04-01 – 2021-03-31
Keywords有機半導体 / 有機エレクトロニクス / 電界効果トランジスタ / 有機半導体レーザー
Outline of Final Research Achievements

To elucidate the characteristics of current-injection organic semiconductor lasers, we studied the oscillation conditions in distributed feedback resonators used in current-injection organic semiconductor lasers. As a result, it was found that not only oscillation at the stopband edge due to coupling between the same mode, which was conventionally considered, but also oscillation at the mini-stopband edge due to coupling between different modes was observed.
In addition, we developed a new structure of light-emitting field-effect transistor using organic semiconductor single-crystals in which the charge transport function and the light-emission function are separated in different materials, and demonstrated the operation of the transistor.

Free Research Field

有機エレクトロニクス

Academic Significance and Societal Importance of the Research Achievements

分布帰還型共振器を用いた有機半導体レーザーの発光波長は共振器の周期だけでなく,有機半導体の厚さにも依存することが知られていたが,その発光波長が計算されたストップバンドで良く説明できるものだけではなく,全く説明できない実験結果も存在した.本研究により,それがミニストップバンドを用いて説明できることが明らかになり,有機半導体レーザーの発光特性の解明に大きく貢献し,発振波長をよりよく制御できるようになった.
また,本研究で新しく開発した素子構造は,電荷輸送と発光効率がともに高い有機半導体の開発が難しいという問題点を,これらの機能を別々の物質に担わせることにより克服する新しいアプローチをもたらした.

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Published: 2023-01-30  

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