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Updated: Aug 11, 2025

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
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Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera

Published on: December 27, 2018

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狭いバンドギャップの結合ポリマーで長寿命のトリプレット興奮状態を生成する

Jose M Marin-Beloqui1,2, Daniel G Congrave3, Daniel T W Toolan4

  • 1Department of Chemistry, University College London, London WC1H 0AJ, U.K.

Journal of the American Chemical Society
|February 3, 2023
PubMed
まとめ

研究者は,狭いバンドギャップ結合ポリマーのトリプル興奮状態の寿命をミリ秒に延長しました. オーガニック半導体におけるこの重要な進歩は,電子とセンサーの応用のための新しい道を開きます.

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Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Thermal and Photochemical Electrocyclic Reactions: Overview

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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