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Photoluminescence: Fluorescence and Phosphorescence01:23

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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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A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
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用于光子向上转换驱动的光交换的多层薄膜.

Zhihang Wang1, Beatrice E Jones1, Larissa G Franca1

  • 1Department of Materials Science and Metallurgy, University of Cambridge 27 Charles Babbage Road Cambridge CB3 0FS UK rce26@cam.ac.uk.

Journal of materials chemistry. C
|November 29, 2024
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概括
此摘要是机器生成的。

三倍-三倍灭绝升级转换 (TTA-UC) 能够使用可见光对norbornadiene-quadricyclane (NBD-QC) 材料进行光交换. 这种方法克服了吸收限制,扩大了可光切换聚合物的应用.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 摄影化学的使用.
  • 聚合物化学 聚合物化学

背景情况:

  • 可光切换材料对于先进的应用,如储能和机器人技术至关重要.
  • 有限的吸收光谱往往限制了它们的实际使用.
  • 通过光物理途径的间接激发,例如三倍感应或光子向上转换,提供了一个解决方案.

研究的目的:

  • 为了证明三倍-三倍灭绝上转换 (TTA-UC) 对于固态光交换的norbornadiene-四旋旋风 (NBD-QC).
  • 为了利用可见光进行NBD-QC光交换,克服紫外线光的限制.
  • 探索TTA-UC在扩大可光交换材料的操作光谱窗口方面的潜力.

主要方法:

  • 制造含有TTA-UC系统 (八乙和9,10-二甲) 和NBD-QC的双层聚合物薄膜.
  • 在固态状态下对TTA-UC系统上升转换效率的描述.
  • 测试NBD-QC的间接光交换,使用可见光通过光谱重叠与TTA-UC发射进行测试.

主要成果:

  • 实现了绿色到蓝色的升级转换,在固态中具有具有竞争力的效率 (1.9 ± 0.1%).
  • 使用可见绿光 (532 nm) 证明了NBD-QC的成功间接光交换.
  • 确认了上转换蓝色发射和NBD吸收之间的光谱重叠,使可见光激活成为可能.

结论:

  • TTA-UC可以有效地驱动NBD-QC材料的固态光交换.
  • 这种方法扩大了可用于光交换应用的可用光谱.
  • 为利用可见光激活的光采集设备和智能涂层铺平了道路.