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関連する概念動画

Photoluminescence: Applications01:14

Photoluminescence: Applications

1.3K
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
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Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

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Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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Updated: May 4, 2026

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
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フォトン向上変換液体:空気中に機能するマトリックスフリー分子向上変換システム.

Pengfei Duan1, Nobuhiro Yanai, Nobuo Kimizuka

  • 1Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), JST CREST, Kyushu University , 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.

Journal of the American Chemical Society
|December 17, 2013
PubMed
まとめ

研究者らは,空中で機能する新しい液体フォトンのアップコンバージョンシステムを開発しました. このシステムは,独特の分子設計により,酸素が存在する場合でも,高い上向き変換量子収量を達成します.

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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
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科学分野:

  • 材料科学 材料科学とは
  • フォトケミストリー フォトケミストリー
  • 物理化学 物理化学

背景:

  • フォトンのアップコンバージョン (UC) は,太陽エネルギーやバイオイメージングなどのアプリケーションに不可欠です.
  • 既存のUCシステムは,しばしば惰性大気や固体マトリックスを必要とし,実用的な使用を制限しています.
  • 空中で動作する安定で効率的な液体状態のUCシステムを開発することは,依然として課題です.

研究 の 目的:

  • 非揮発性で空気に安定した液体フォトンのアップコンバージョンシステムを開発する.
  • 溶媒のない液体介質で高い上昇変換効率を達成するために.
  • 液体UCシステムにおける酸素無感性のメカニズムを調査する.

主な方法:

  • 三重感受剤として,枝分かれアルキル鎖改変Pt(II) ポルフィリンを合成した.
  • 感受剤を9.10-ジフェニラントラセンの単位を含む液体受容体にドーピングした.
  • 空気条件下での上方変換の量子収量と発光特性を特徴づけた.

主要な成果:

  • 溶媒のない液体状態で約28%の高上変換量子収量を達成しました.
  • シングレット興奮状態の形成につながる効率的なトリプレットエネルギー転送と移行が実証されています.
  • 溶けたアルキル鎖に起因する酸素へのアップコンバーション発光の感受性の欠如が観察されました.

結論:

  • 頑丈で空気で機能する液体フォトンの上向き変換システムが成功裏に開発されました.
  • システムの空気中の安定性は,改変された染色体のユニークな特性に関連しています.
  • トリプル・トリプル・アニヒライレーション (TTA) のエネルギー移行は,高度なUCシステムのための新しい設計戦略を提供します.