白色发光量子点的荧光可逆开关调控

Abstract

使用二芳基乙烯(DAE)光分子开关调控白色发光量子点(WQDs)的荧光特性,通过DAE分子开关的异构,有效控制其与WQDs之间的三线态能量传递(TET),实现了宽光谱WQDs荧光的可逆开关功能。原位荧光强度测试结果显示,当使用叔丁基官能团修饰的DAE(t-DAE)进行WQDs荧光调控时,以Förster共振能量转移机制为主的过程仅能使WQDs荧光猝灭34.1%,荧光开关比为1.5。当使用羧基官能团修饰的DAE(ac-DAE)时,羧基以共价键形式连接到WQDs表面,可实现短距离的Dexter能量传递,荧光猝灭效率与开关比分别高达99.2%与125。纳秒瞬态吸收光谱测试中出现的三重态吸收特征峰,有效验证了基于Dexter能量传递的TET机制。在8个开关循环测试下,体系呈现优异的可逆性和抗疲劳性。本研究表明,利用DAE分子开关可实现对WQDs荧光开关的高效可逆光调控。

Publication
光学学报, 45, 0926004
Shuai Zhang 张帅
Shuai Zhang 张帅
Postdoctoral in School of Precision Instruments and Optoelectronics Engineering

My research interests include quantum dots and smart devices.

Lin Xi 郗琳
Lin Xi 郗琳
Master student in School of Precision Instruments and Optoelectronics Engineering
Qingxin Luan 栾庆鑫
Qingxin Luan 栾庆鑫
Doctoral student in School of Precision Instruments and Optoelectronics Engineering
Lili Hou 侯丽丽
Lili Hou 侯丽丽
Professor in School of Precision Instruments and Optoelectronics Engineering

My research interests include photoresponsive molecular switches/motors, photomodulation devices and triplet-triplet annihilation(TTA) upconversion.