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相关概念视频

Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Photoluminescence: Applications01:14

Photoluminescence: Applications

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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相关实验视频

Updated: Jul 9, 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

溶液可加工的结合式电光聚合物.

Albertus J Sandee1, Charlotte K Williams, Nicholas R Evans

  • 1Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom.

Journal of the American Chemical Society
|June 4, 2004
PubMed
概括
此摘要是机器生成的。

研究人员开发了新的复合物,用于高效的发光二极管. 这些光材料具有可调节的发射颜色,并通过对烯单元的共价附着提高了效率.

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相关实验视频

Last Updated: Jul 9, 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

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Published on: September 20, 2017

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科学领域:

  • 材料科学 材料科学 材料科学
  • 有机化学 有机化学
  • 光物理学的光学物理学

背景情况:

  • 光化复合物对于高效的有机发光二极管 (OLED) 是至关重要的.
  • 通过分子设计控制排放特性是先进显示技术的关键.

研究的目的:

  • 合成和研究可处理溶液的新型光化复合物.
  • 为了研究结合伊单元与oligo(9,9-dioctylfluorenyl-2,7-diyl) 对光物理性质的影响.
  • 评估它们在聚合物发光二极管 (PLED) 中的性能.

主要方法:

  • 对二环金属化复合物的合成,这些复合物与烯寡合物共连接.
  • 光发光和电光发光研究.
  • PLED设备的制造和特征.

主要成果:

  • 复合物[Ir(ppy-(FO) ((n)) ((2) ((acac) ]和[Ir(btp-(FO) ((n)) ((2) ((acac) ]被合成了不同的烯单位长度 (n).
  • 对于短链复合体,观察到绿色辐射,由于烯附着,红移约70 meV.
  • 有效的红色光PLED是通过聚合物复合物[Ir(btp-(FO) (((n)) (((2) ((acac) ] (n=5-40) 实现的,显示 ~50 meV 红移.
  • 素单点排放被有效地灭,并通过延长联来修改三重能量.

结论:

  • 复合物的对单元的共价附着允许对三重能量和辐射颜色进行受控的修改.
  • 与简单的混合物相比,这些新材料提供了更高的效率.
  • 这项研究为进一步研究发光二极管中的能量转移提供了基础.