从碳纳米管通过单片氧敏感三片激光器延迟光
Ching-Wei Lin1, Sergei M Bachilo1, R Bruce Weisman1,2
1Department of Chemistry and the Smalley-Curl Institute, Rice University, Houston, Texas 77005, United States.
Journal of the American Chemical Society
|December 3, 2020
概括
单壁碳纳米管表现出由单片氧驱动的三重激子的延迟光. 这种能量传输机制对于了解SWCNT的光学特性和潜在应用至关重要.
科学领域:
- 材料科学
- 物理化学
- 纳米技术
背景情况:
- 单壁碳纳米管 (SWCNT) 具有独特的光物理特性.
- 在SWCNT中延迟光与三重激子和单重氧 (1O2) 有关.
- 了解能量传输机制是它们在光电子应用的关键.
研究的目的:
- 阐明SWCNT中延迟光的机制.
- 调查单体氧 (1O2) 在上转三重激素生成中的作用.
- 确定三重激子的能量和向上转换过程的效率.
主要方法:
- 时间解析的排放动力学测量.
- 延迟的辐射谱分析.
- 极化解决的激发发射谱.
主要成果:
- 延迟光源于通过1O2能量转移形成的向上转换的三重激子.
- 单片氧是通过灭光学激发的有机敏感剂来产生的.
- (7,6) 三重激子的能量大约为970 meV.
- 上升转换收益率 (E11 → E11) 在几百分比之间.
- 产量随温度增加而随激发强度降低,表明热激活和三倍三倍灭绝.
结论:
- 这项研究阐明了SWCNT中1O2中介延迟光的机制.
- SWCNT 结构显著影响 1O2 敏感化效率.
- 这些发现为纳米材料中的三重激子动态和能量转移提供了洞察力.
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