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相关概念视频

Photoluminescence: Applications01:14

Photoluminescence: Applications

386
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...
386
Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
576
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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相关实验视频

Updated: Jun 21, 2025

Low-energy Cathodoluminescence for OxyNitride Phosphors
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陶复合材料用于可调节的温暖白光.

Ross A Osborne1,2, Nerine J Cherepy1, Peter S Bleier2

  • 1Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, CA 94550, USA.

Materials (Basel, Switzerland)
|July 13, 2024
PubMed
概括

使用K2SiF6:Mn4+ (KSF) 和Y3Al5O12:Ce3+ (YAG) 的新复合陶可以实现温暖的白色LED光. 这些材料为先进的照明应用提供了更好的导热性和更少的垂落.

关键词:
照明灯LED是指LED的灯光.陶制品的陶制品是一种陶.复合材料 复合材料 是一种复合材料.照明照明照明照明照明光灯是什么? 光灯是什么

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科学领域:

  • 固态照明 固态照明
  • 材料科学是一种材料科学.
  • 发光的光度是非常的低.

背景情况:

  • 开发高效和稳定的光剂对于高质量的LED照明至关重要.
  • 传统的玻璃中或中技术在热管理和长期稳定性方面存在局限性.
  • 窄带红色光体和黄色光体是实现LED中温暖白光发射的关键组件.

研究的目的:

  • 制造和特征复合陶用于温暖白色LED照明.
  • 研究K2SiF6:Mn4+ (KSF) 和Y3Al5O12:Ce3+ (YAG) 复合材料的光学和热性能.
  • 探索这些复合材料在高性能LED应用中的潜力.

主要方法:

  • 用KSF作为矩阵和YAG作为分散粒子制造复合陶.
  • 在蓝色LED激发下发射光谱的光学特征,不同的YAG负载和陶厚度.
  • 测量导热率和颜色质量参数 (颜色温度,CRI,R9) 的测量.

主要成果:

  • 获得了温的白光,颜色温度为2716K,高颜色染指数 (CRI) 为92.6,R9值为77.6.6.
  • 随着YAG的添加,观察到热导率的适度改善 (高达9%).
  • 开发并验证了基于复合参数的排放光谱的预测模型.

结论:

  • KSF/YAG复合陶对于产生高质量的温暖白光是有效的.
  • 复合材料显示出由于增强的导热率和降低的效率下降而具有更高驱动力的LED应用的潜力.
  • 通过调整材料组成和结构来调整排放光谱的可调性提供了设计灵活性.