Controlling excited-state proton transfer dynamics using nanocavity engineering

使用纳米腔工程控制激发态质子转移动力学

基本信息

批准号：
19F19034
负责人：
恩田健
金额：
$ 1.47万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2019
资助国家：
日本
起止时间：
2019-10-11 至 2022-03-31
项目状态：
已结题

项目摘要

Controlling excited-state characters of molecules is of great importance for developing novel photofunctional materials. Encapsulation of a molecule is one of the promising methods by coupling with rapid development of novel porous materials such as metal organic frameworks. Nevertheless, there is little information on excited characters in a small cavity due to experimental and theoretical difficulties. We developed the handling methods of molecules in a various nano- and micro-cavities and combined with our ultrafast spectroscopic techniques. As a result, we found that the emissive character of a prototypical emissive molecule, benzophenone, is dramatically changed when it is encapsuled in a nanocavity of mesoporous material, MCM-41. Aiming at applications of this novel phenomenon to luminescent devices, we also investigated encapsulation effects on emissive materials for organic light emitting diode (OLED), and found that the encapsulation highly improves their thermally activated fluorescence (TADF) activities. Recently, TADF activities have attracted much attention for applications not only to the emissive materials for OLED but also to the harvesting of long-lived triplet-states in various photofunctional materials. Thus, this new finding would be contributed to developments of novel highly efficient photofunctional devices. Moreover, we discovered that light irradiation accelerates encapsulation process for a certain type of emissive materials. This finding would open a new world such as light control of encapsulation and decapsulation of photofunctional molecules.

控制分子的激发状态对于开发新型光功能材料至关重要。分子的封装是通过与新型多孔材料（例如金属有机框架）的快速开发结合的一种有希望的方法之一。然而，由于实验性和理论上的困难，几乎没有关于小腔中激发角色的信息。我们开发了各种纳米和微腔中分子的处理方法，并与我们的超快光谱技术结合使用。结果，我们发现，当将其封装在介孔材料的纳米腔MCM-41中时，原型发射分子的发射特征苯甲酮会发生巨大变化。针对这种新现象到发光设备的应用，我们还研究了对发射二极管（OLED）发射材料（OLED）的封装影响，并发现封装高度改善了其热活化荧光（TADF）活性。最近，TADF的活动不仅吸引了对OLED发射材料的应用，而且还吸引了各种光功能材料中长寿三胞胎的收获。因此，这一新发现将有助于新型高效光功能设备的发展。此外，我们发现光照射会加速某种类型的发射材料的封装过程。这一发现将打开一个新世界，例如对光功能分子的封装和脱包的光控制。