相关实验视频
Updated: Jun 12, 2025
07:03
Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
10.6K
立方和六角结构的SrTa4O11:Er3+/Yb3+光体的上转换发光
Xuekai Wang1, Yongze Cao1, Xianglan Yan1
1Department of Physics, Dalian Maritime University, Dalian, 116026, China. cyz@dlmu.edu.cn.
Dalton transactions (Cambridge, England : 2003)
|September 26, 2024
概括
六角性坦酸盐 (SrTa4O11):Er3+/Yb3+体表现出强大的向上转换发光 (UCL) 和温度敏感性. 这些材料对UCL显示器和温度传感应用有前途.
科学领域:
- 材料科学 材料科学 材料科学
- 发光的光度是非常的低.
- 固态化学 固态化学
背景情况:
- 用Er3+/Yb3+合的坦酸盐 (SrTa4O11) 光体被研究其上转换发光 (UCL) 特性.
- 了解合成方法和晶体结构对UCL的影响对于开发先进光学材料至关重要.
研究的目的:
- 通过固态反应 (SSR) 和盐合成 (MSS) 合成立方体和六角形SrTa4O11:Er3+/Yb3+.
- 为了研究和比较合成光体的上转换发光 (UCL) 强度和温度灵敏度.
- 探索这些体在UCL显示器和温度传感器中的潜在应用.
主要方法:
- 在空气和真空中进行固态反应 (SSR).
- 使用KCl和B2O3流的盐合成 (MSS).
- 用HCl溶液进行酸处理 (AP).
- 向上转换发光 (UCL) 强度测量.
- 发光强度比 (LIR) 技术用于温度灵敏度评估.
主要成果:
- 通过MSS与B2O3流量合成的六边形SrTa4O11:Er3+/Yb3+表现出最强的UCL强度.
- 在MSS-B2O3样本中,酸性化增加了2.18倍的绿色UCL强度.
- 六角结构显示出明显更高的UCL强度比立方结构由于分层结构和非中心对称性.
- 在303K时,达到0.0099K-1的最大相对温度灵敏度.
结论:
- 六边形SrTa4O11:Er3+/Yb3+具有出色的纯绿色UCL强度和高温灵敏度.
- 合成方法,特别是使用B2O3流量的MSS,然后进行酸性,显著增强了UCL的特性.
- 这些光体是升级光显示器和温度传感器应用的有希望的候选物.
相关概念视频
01:14Photoluminescence: Applications
383
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...
383
01:23Photoluminescence: Fluorescence and Phosphorescence
1.6K
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...
A pair of electrons in a...
1.6K
01:26Variables Affecting Phosphorescence and Fluorescence
491
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...
491