Chen Kezhou, Liu Jiayi, Andréasson Joakim, Albinsson Bo, Liu Tiegen, Hou Lili
School of Precision Instrument and Opto-Electronics Engineering, Tianjin University Tianjin 300072 China
Key Laboratory of Opto-electronics Information Technology (Tianjin University) Tianjin 300072 China.
Chem Sci. 2024 Nov 13;15(48):20365-20370. doi: 10.1039/d4sc06110a. eCollection 2024 Dec 11.
All-visible light-activated diarylethene (DAE) photoswitches are highly attractive for applications in smart photoresponsive materials. The photocyclization of DAE the low-lying excited triplet state through triplet energy transfer (TET) from a sensitizer has been proven to be an effective approach for the realization of this scheme. However, the TET process is sensitive to oxygen and typically requires more than one sensitizer per photoswitch to facilitate sensitized photocyclization. Herein, we present a bi-component system comprising carboxylic acid-functionalized DAEs and CdS quantum dots (QDs) to achieve all-visible light-activated photoswitching. Due to the large surface area-to-volume ratio of CdS QDs and surface anchored DAEs, one CdS QD can activate at least 18 DAE molecules in the solution without oxygen exclusion. The efficiency of photocyclization of DAEs under visible light irradiation through energy transfer from CdS QDs is nearly comparable to that of direct UV light irradiation. Moreover, our strategy is adaptable for solid-state applications in the presence of air, enabling reversible writing and erasing of color and patterns by adjusting irradiation wavelengths in the visible region.
所有可见光激活的二芳基乙烯（DAE）光开关在智能光响应材料应用中极具吸引力。通过敏化剂的三重态能量转移（TET）使DAE在低激发三重态下发生光环化，已被证明是实现该方案的有效方法。然而，TET过程对氧气敏感，并且每个光开关通常需要不止一种敏化剂来促进敏化光环化。在此，我们提出了一种由羧酸官能化的DAE和硫化镉量子点（QD）组成的双组分体系，以实现全可见光激活的光开关效应。由于硫化镉量子点的大表面积与体积比以及表面锚定的DAE，一个硫化镉量子点在不排除氧气的情况下可在溶液中激活至少18个DAE分子。通过从硫化镉量子点进行能量转移，DAE在可见光照射下的光环化效率几乎与直接紫外光照射相当。此外，我们的策略适用于存在空气的固态应用，通过调节可见光区域的照射波长，能够实现颜色和图案的可逆写入和擦除。
