接近红外到可见光子上转换通过具有S0-T1吸收强度的金属复合物敏感化
Shogo Amemori1, Yoichi Sasaki1, Nobuhiro Yanai1,2
1Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems, Kyushu University , 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
这项研究引入了一种新的近红外 (NIR) 到可见光子上转换 (UC) 方法,使用具有直接S0-T1吸收的敏感剂,克服能量损失. 开发的系统实现了有效的空气UC排放,扩大了NIR-to-visUC应用的可能性.
科学领域:
- 材料科学
- 摄影化学
- 纳米技术
背景情况:
- 光子上转换 (UC) 对各种应用至关重要,但基于三倍三倍灭绝 (TTA) 的UC由于系统间交叉 (ISC) 的能量损失而面临挑战.
- 传统的分子敏感剂在S1-T1 ISC过程中经常产生能量损失,从而限制了NIR对UC的效率.
研究的目的:
- 开发一种新的NIR-to-vis光子上升转换系统,以规避与传统敏感器相关的能量损失.
- 探索在NIR区域使用具有直接S0到T1吸收的敏感剂,以获得高效的UC.
主要方法:
- 用于NIR- to- vis UC,使用了具有强度S0-T1吸收的复合物的混合溶液和散射器.
- 通过再沉制备有敏感剂的发射纳米粒子,并将其纳入氧屏障聚合物薄膜.
- 使用三重能量迁移 (TEM) 作为UC机制.
主要成果:
- 该系统成功地将NIR光 (938nm) 转换为可见光 (570nm),使用复合物和发射器.
- 复合膜在空气中显示出稳定的NIR-vs-UC排放,归因于TEM.
- 在TEM-UC系统中获得了3.1%的高UC量子产量.
结论:
- 这项研究提出了一种有效的策略,通过使用直接S0到T1NIR吸收的敏感剂来克服基于TTA的UC中的能量损失.
- 开发的基于纳米粒子的复合膜提供了稳定高效的NIR-to-visUC发射,扩大了适用的分子敏感剂的范围.
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