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相关概念视频

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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相关实验视频

Updated: Jun 30, 2026

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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增强NIR-II上转换单色发射用于温度传感.

Xiaomeng Liu1, Tongtong Liu1, Langping Tu2

  • 1State Key Laboratory of Explosion Science and Technology, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Small (Weinheim an der Bergstrasse, Germany)
|January 29, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了在第二近红外窗 (NIR-II) 中发射的新型单色上转化纳米粒子 (UCNPs),用于增强生物成像和传感. 这些NIR-II UCNP表现出温度依赖的发光,从而实现精确的温度传感应用.

关键词:
一种单色发射的单色发射.接近红外线的近红外线.温度传感器是一种温度传感器.上升转换是一种上升转换.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 光学是什么?光学是什么?光学是什么?

背景情况:

  • 在第二个近红外窗口 (NIR-II) 中的上转换发光 (UCL) 对于高级应用,如高分辨率生物成像和防伪等,至关重要.
  • 传统的上转化纳米粒子 (UCNPs) 通常在可见光谱中发射,这可能会损害成像质量.

研究的目的:

  • 开发在NIR-II区域发射的单色UCNP,以提高生物成像和传感能力.
  • 调查 (Yb3+) 兴奋剂对富含 (Er3+) 的UCNP的NIR-II发射特性的影响.
  • 探索这些NIR-II UCNPs在准确的温度传感方面的潜力.

主要方法:

  • 合成富含Er3+ (NaErF4:x%Yb@NaYF4) 的纳米粒子.
  • 在1532nm激发下,向上转换的发光特性的表征.
  • 在可见区域和NIR-II区域中分析温度依赖的发光强度.

主要成果:

  • 成功制造出在NIR-II区域 (978 nm) 发射的单色UCNP.
  • 优化的Yb3+兴奋剂通过改善交叉放松和能量转移来增强NIR-II排放.
  • 观察到与温度变化的可见和NIR-II发光强度的相反趋势.
  • 开发了一种基于发光强度比的温度测定公式.

结论:

  • 开发的单色NIR-II UCNPs为生物成像和防伪提供了卓越的性能.
  • 取决于温度的发光特性使得在NIR-II区域能够精确地感知温度.
  • 这些发现为UCNP在先进光学技术中的新应用铺平了道路.