Organic Bilayer Heterostructures with Built-In Exciton Conversion for 2D Photonic Encryption
Bin Wu1, Min Zheng2, Ming-Peng Zhuo2*（卓明鹏）, Yu-Dong Zhao1, Yang Su1, Jian-Zhong Fan3, Peng Luo1, Lin-Feng Gu1, Zong-Lu Che4, Zuo-Shan Wang1*（王作山）, Xue-Dong Wang4*（王雪东）
1College of Chemistry Chemical Engineering and Materials Science Soochow University, Suzhou 215123, China
2National Engineering Laboratory for Modern Silk College of Textile and Clothing Engineering, Soochow University, Suzhou 215123,China
3School of Physics and Electronics, Shandong Normal UniversityJinan 250014, China
4Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University Suzhou 215123, China
Adv. Mater. 2023, 2306541
Abstract：Organic multilayer heterostructures with accurate spatial organization demonstrate strong light-matter interaction from excitonic responses and efficient carrier transfer across heterojunction interfaces, which are considered as promising candidates toward advanced optoelectronics. However, the precise regulation of the heterojunction surface area for finely adjusting exciton conversion and energy transfer is still formidable. Herein, organic bilayer heterostructures (OBHs) with controlled face-to-face heterojunction via a stepwise seeded growth strategy, which is favorable for efficient exciton propagation and conversion of optical interconnects are designed and synthesized. Notably, the relative position and overlap length ratio of component microwires (LDSA/LBPEA = 0.39-1.15) in OBHs are accurately regulated by modulating the crystallization time of seeded crystals, resulting into a tailored heterojunction surface area (R=Loverlap/LBPEA=37.6%-65.3%). These as-prepared OBHs present the excitation position-dependent waveguide behaviors for optical outcoupling characteristics with tunable emission colors and intensities, which are applied into two-dimensional (2D) photonic barcodes. This strategy opens a versatile avenue to purposely design OBHs with tailored heterojunctions for efficient energy transfer and exciton conversion, facilitating the application possibilities of advanced integrated optoelectronics.
链接：//onlinelibrary.wiley.com/doi/10.1002/adma.202306541
