Hierarchical Self‐Assembly of Organic Core/Multi‐Shell Microwires for Trichromatic White‐Light Sources

• Published in: Advanced materials (Weinheim) Vol. 33; no. 40; pp. e2102719 - n/a
• Main Authors: Zhuo, Ming‐Peng, Su, Yang, Qu, Yang‐Kun, Chen, Song, He, Guang‐Peng, Yuan, Yi, Liu, Hao, Tao, Yi‐Chen, Wang, Xue‐Dong, Liao, Liang‐Sheng
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.10.2021
• Subjects: Assembly; Backlights; Charge transfer; core/shell structures; Display devices; Emission; Emissivity; energy transfer; Epitaxial growth; Heterostructures; Light sources; Materials science; Multiplexing; Optoelectronics; organic cocrystals; Portable equipment; solid‐state lighting sources; Synthesis
• ISSN: 0935-9648; 1521-4095; 1521-4095
• DOI: 10.1002/adma.202102719

White‐light‐emissive organic micro/nanostructures hold exotic potential applications in full‐color displays, on‐chip wavelength‐division multiplexing, and backlights of portable display devices, but are rarely realized in organic core/shell heterostructures. Herein, through regulating the noncovalent interactions between organic semiconductor molecules, a hierarchical self‐assembly approach of horizontal epitaxial‐growth is demonstrated for the fine synthesis of organic core/mono‐shell microwires with multicolor emission (red–green, red–blue, and green–blue) and especially organic core/double‐shell microwires with radial red–green–blue (RGB) emission, whose components are dibenzo[g,p]chrysene (DgpC)‐based charge‐transfer (CT) complexes. In fact, the desired lattice mismatching (≈2%) and the excellent structure compatibility of these CT complexes facilitate the epitaxial‐growth process for the facile synthesis of organic core/shell microwires. With the RGB‐emissive substructures, these core/double‐shell organic microwires are microscale white‐light sources (CIE [0.34, 0.36]). Besides, the white‐emissive core/double‐shell microwires demonstrate the fascinating full‐spectrum light transportation from 400 to 700 nm. This work indeed opens up a novel avenue for the accurate construction of organic core/shell heterostructures, which provides an attractive platform for the organic integrated optoelectronics. Through regulating the noncovalent interactions between organic semiconductor molecules (|ECT, DgpC‐TCNB = −18.35 kcal mol−1| > |ECT, DgpC‐TFP = −13.45 kcal mol−1| > |Eπ–π, DgpC = −6.81 kcal mol−1|), a hierarchical self‐assembly approach of horizontal epitaxial‐growth is demonstrated for the precise synthesis of organic core/double‐shell microwires with radial red–green–blue (RGB) substructures for miniaturized white‐light sources (CIE [0.34, 0.36]).