多波长激发赋予协同向上转换效应从合作收获的能量转移合作
1School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore. edwinyeow@ntu.edu.sg.
概括
同时激发感应剂 (Nd3+,Yb3+) 的激发会使纳米晶体中的上转换 (UC) 光发能增加3.5倍. 这种增强源于从Yb3+向激活器 (Tm3+,Er3+) 的合作能量传输.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 频谱学是一种光谱学.
背景情况:
- 上转换 (UC) 纳米晶体对于需要从近红外激发可见光谱中的光辐射的应用至关重要.
- 了解UC系统中的能量传输机制是优化发光效率的关键.
研究的目的:
- 为了研究同时激发感应剂对UC纳米晶体中激活剂的上转换发光效应的影响.
- 为了阐明负责增强发光的能量传输途径.
主要方法:
- 用敏感剂 (Nd3+, Yb3+) 和激活剂 (Tm3+, Er3+) 合的UC纳米晶体的合成.
- 频谱分析涉及不同波长同时激发不同波长的敏感剂.
- 时间分辨率的发光度测量,以研究能量转移动态.
主要成果:
- 观察到Tm3+和Er3+激活器的UC发光强度提高了3.5倍.
- 证明了 Nd3+ 和 Yb3+ 敏感剂的同时激发会导致显著的发光改善.
- 从直接和间接激发的Yb3+转移到激活器作为主要机制.
结论:
- 同时激发感应器是一种有效的策略,可以提高UC发光效率.
- 涉及Yb3+的合作能量传输机制在促进激活器排放方面发挥着至关重要的作用.
- 这一发现对开发各种应用的先进UC材料有影响.
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