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Updated: Feb 12, 2026

Absolute Quantum Yield Measurement of Powder Samples
Published on: May 12, 2012
超小核心/外升级纳米颗粒的量子产量,表面火和被动化效率
Christian Würth1, Stefan Fischer, Bettina Grauel1
1Federal Institute for Materials Research and Testing (BAM) , Richard-Willstätter-Straße 11 , 12489 Berlin , Germany.
我们开发了超小的NaGdF4:Yb/Er上转化纳米粒子, 一个5nm外优化可见和短波红外发光,使新的成像应用.
科学领域:
- 材料科学
- 纳米技术
- 光子学
背景情况:
- 极小的六角相NaGdF4:Yb3+,Er3+上转化纳米粒子 (UCNP) 对生物成像具有前景.
- 控制外厚度对于优化发光特性和防止核心外混合至关重要.
研究的目的:
- 合成和描述具有不同NaYF4外厚度的超小UCNP.
- 调查外厚度对可见和短波红外 (SWIR) 图像的上升转换和下移光发光的影响.
- 确定最佳的UCNP结构以提高成像性能.
主要方法:
- 核心UCNP (3.7 ± 0.5 nm) 的合成和随后的生长 (单层到10 nm).
- 光发光的特征包括激发功率依赖的辐射光谱,斜率因子,量子产量和衰变动力学.
- 使用光谱工具对核心外混合的分析.
主要成果:
- 在低激发功率下增强了10,000倍以上的上转换量子产量.
- 实现了独立于激发功率密度的SWIR量子输出率 (0.1-14%).
- 优化的5纳米外厚度用于可见和SWIR成像.
- 持续调整生命周期和量子产量与外厚度.
结论:
- 厚度是调整UCNP光发光的关键参数,用于双模式成像.
- 一个5纳米的NaYF4外为可见和SWIR应用提供了最佳性能.
- 在UQY和衰变动力学中观察到的和不足表明了可通过光谱检测的显著的核心外混合.
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