题目：

Customizable Organic Charge-Transfer Cocrystals for the Dual-Mode Optoelectronics in the NIR (II) Window

作者：

Yue Yu¹,Xing-Yu Xia¹, Chao-Fei Xu¹, Zhao-Ji Lv¹, Xue-Dong Wang¹*, Liang-Sheng Liao^1,2*

单位：

¹Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou 215123, P. R. China.

²Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Macau, P. R. China.

摘要：

Organic molecules have been regarded as ideal candidates for near-infrared (NIR) optoelectronic active materials due to their customizability and ease of large-scale production. However, constrained by the intricate molecular design and severe energy gap law, the realization of optoelectronic devices in the second near-infrared (NIR (II)) region with required narrow band gaps presents more challenges. Herein, we have originally proposed a cocrystal strategy that utilizes intermolecular charge−transfer interaction to drive the redshift of absorption and emission spectra of a series BF_XTQ (X = 0, 1, 2, 4) cocrystals, resulting in the spectra located at NIR (II) window and reducing the optical bandgap to∼0.98 eV. Significantly, these BF_XTQ-based optoelectronic devices can exhibit dual-mode optoelectronic characteristics. An investigation of a series of BF_XTQ-based photodetectors exhibits detectivity (D*) surpassing 10¹³Jones at 375 to 1064 nm with a maximum of 1.76 × 10¹⁴Jones at 1064 nm. Moreover, the radiative transition of CT excitons within the cocrystals triggers NIR emission over 1000 nm with a photoluminescence quantum yield (PLQY) of∼4.6% as well as optical waveguide behavior with a low optical-loss coefficient of 0.0097 dB/μm at 950 nm. These results promote the advancement of an emerging cocrystal approach in micro/nanoscale NIR multifunctional optoelectronics.

影响因子：

14.4

分区情况：

一区

链接：

https://doi.org/10.1021/jacs.4c00648

责任编辑：郭佳