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関連する概念動画

Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Properties of Transition Metals02:58

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

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関連する実験動画

Updated: Jul 7, 2026

Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes
05:51

Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes

Published on: November 15, 2016

イリジウムベースのカチオン型移行金属複合体を用いた固体白色光を発する電気化学セルです.

Hai-Ching Su1, Hsiao-Fan Chen, Fu-Chuan Fang

  • 1Department of Electrical Engineering, Graduate Institute of Electro-optical Engineering, National Taiwan University, Taipei 10617, Taiwan.

Journal of the American Chemical Society
|February 28, 2008
PubMed
まとめ

研究者らは,イリジウム複合体を用いた白い固体発光電気化学セル (LEC) を開発した. これらのデバイスは,高効率で高品質のホワイトライトを提供し,先進的な照明技術の有望な未来を示唆しています.

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A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting
08:57

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting

Published on: March 9, 2017

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
08:54

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

関連する実験動画

Last Updated: Jul 7, 2026

Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes
05:51

Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes

Published on: November 15, 2016

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting
08:57

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting

Published on: March 9, 2017

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
08:54

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

科学分野:

  • マテリアルサイエンス 材料科学
  • 固体物理 固体物理学
  • フォトケミストリー フォトケミストリー

背景:

  • 固体照明技術は,エネルギー効率の確保に不可欠です.
  • 効率的で安定した白い光を発する装置の開発は,依然として重要な課題です.
  • イリジウム複合体は,電気発光特性で知られている.

研究 の 目的:

  • 単層の固体発光電気化学電池 (LEC) から白色電光発光放射を証明する.
  • ホワイトライト生成のためのLECにおけるホスト-ゲストカチオンイリジウム複合体の性能を調査する.

主な方法:

  • 単層の固体発光電気化学セル (LEC) の製造.
  • ホスト・ゲストのイリジウム複合体を放射材料として利用する.
  • 電気発光スペクトルの特性,効率,色素表示.

主要な成果:

  • 白い電気発光放射の実証に成功しました.
  • Commission Internationale de l'Eclairageの座標は,2.9-3.3Vで (0.45,0.40) から (0.35,0.39) までの範囲で達成されました.
  • 高度なカラーレンダリングインデックスは80まで.
  • ピークの外部量子効率は4%で,ピーク電力効率は7.8 lm/Wです.

結論:

  • ホスト・ゲスト・カチオニウム・イリジウム・コンプレックスは,LECで白色電解光を発生させるのに有効です.
  • これらの白いLECは,固体照明の実行可能な代替品としての潜在能力を示しています.
  • 開発された技術は,高い効率と優れたカラー品質を提供します.