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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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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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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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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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相关实验视频

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有机长时间持续发光

Ryota Kabe1,2, Chihaya Adachi1,2,3

  • 1Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

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|October 3, 2017
PubMed
概括
此摘要是机器生成的。

研究人员使用简单的分子开发了一种新型有机长时间持续发光材料 (OLPL). 这种无稀有元素的OLPL系统提供了一个透明,灵活的替代传统的无机暗光材料.

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科学领域:

  • 材料科学
  • 有机电子
  • 光物理学

背景情况:

  • 长时间持续发光 (LPL) 材料通常被称为暗中发光物质,储存并缓慢释放能量作为光.
  • 目前的无机LPL材料通常以氧化物为基础,需要稀有元素和高温制造,限制透明度和应用.

研究的目的:

  • 开发一种无稀有元素且易于制造的新型有机LPL (OLPL) 系统.
  • 克服现有的无机LPL材料的局限性,例如高制造温度和透明度差.

主要方法:

  • 使用两个简单的有机分子制造OLPL系统.
  • 基于长寿命电荷分离状态的脱形成的发射特性.
  • 在各种温度下标准白色LED光下激发和发射的特征.

主要成果:

  • 新的OLPL系统在室温下发光超过一个小时.
  • 有机系统是透明的,可溶性的,
  • 不同于之前的有机系统,

结论:

  • 这种没有稀有元素的OLPL系统为无机LPL材料提供了有希望的替代品.
  • 这种透明度,灵活性和可调色的颜色在涂料,生物标志物,织物和窗户中开辟了新的应用.
  • 这项研究促进了对有机半导体器件长寿命电荷分离的理解.