在上转换发光中的热效应NaYF:Tm3+,Yb核心外纳米粒子在18-312K的温度范围内
Jurgis Grube1, Jelena Butikova1
1Institute of Solid State Physics, University of Latvia, Riga, Latvia.
Applied spectroscopy
|October 13, 2023
概括
降低核心外纳米粒子的温度显著提高了 (Tm3+) 上转换发光,增强了蓝色和紫外线的排放. 三种热火机制解释了这些取决于温度的变化.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 发光光谱学 光谱学
背景情况:
- 化纳米粒子中的上转换发光对于各种光子应用至关重要.
- 取决于温度的发光特性对于理解和优化纳米材料性能至关重要.
- 与Tm3+和Yb3+合的核心外结构的NaYF4纳米粒子对上转换应用有前途.
研究的目的:
- 为了研究温度对NaYF4:Tm3+,Yb3+核心外纳米粒子中 (Tm3+) 上转换发光的影响.
- 在低温下量化发光增强.
- 识别和解释底层的热火机制.
主要方法:
- 合成核心外结构的NaYF4:Tm3+,Yb3+纳米粒子.
- 在976nm使用激光激发纳米粒子.
- 在18K至312K的温度范围内测量向上转换的发光光谱.
主要成果:
- 随着温度从312K降低到18K,观察到Tm3+上转换发光强度的显著增加 (平均60倍).
- 在低温下检测到强烈的蓝色和紫外线辐射带.
- 确定了三种不同的热灭机制:激发辐射吸收,斯塔克次级人口动态和Yb3+到Tm3+的能量转移.
结论:
- 温度在调节NaYF4:Tm3+,Yb3+纳米颗粒中的Tm3+向上转换发光方面发挥着关键作用.
- 低温大大提高了发光量,使这些纳米粒子适用于需要强烈蓝色和紫外线辐射的应用.
- 了解已识别的热火机制对于设计和优化上转化纳米材料至关重要.
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