通过抑制反向能量转移来抑制Yb3+-Tm3+上转化纳米粒子中的度火
Dingxin Huang1,2, Feng Li1,2, Hans Ågren1,3
1MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, PR China.
Nature communications
|May 6, 2025
概括
我们开发了一种核心-外-外纳米结构,通过分离敏感剂和激活剂离子来提高胺化升级转化纳米颗粒的亮度. 这种设计克服了度火,提高了生物成像和传感应用的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 光子学 是一个光子学.
背景情况:
- 添加兰化剂的升级转化纳米粒子 (UCNPs) 在生物传感,生物成像和激光等方面显示出潜力.
- 它们的亮度通常受到激活体离子度灭的限制.
- 由于这种火效应,现有的UCNP在最佳激活体离子度方面扎.
研究的目的:
- 设计一种新的纳米结构,可以减轻兰化离子度火.
- 为了提高UCNP的亮度和实用性,用于各种应用.
- 为了研究背后的机制提高了转换效率.
主要方法:
- 使用六边形NaYF4.4制造一个异质的核心--纳米结构.
- (Tm3+) 激活剂和 (Yb3+) 敏感剂的空间分离成不同的层 (核心和内部外).
- 使用最外围的外来最大限度地减少表面火效应.
主要成果:
- 核心外外设计显著减轻了激活器度火.
- 与只有核心的UCNP相比,在低照射率 (低于100W/cm2) 的最佳Tm3+度从1%增加到8%.
- 在高照射率 (20MW/cm2) 时,最佳的Tm3+度达到50%.
- 空间分离抑制了从Tm3+到Yb3+的反向能量传输.
结论:
- 不同质的纳米结构通过克服度火,有效地提高了UCNP的亮度.
- 这种设计策略为开发高效的升级材料提供了一条途径.
- 这些发现加深了对坦化度火机制的理解.
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