Controllable supramolecular chain aggregation through nano-steric hindrance functionalization for multi-color larger-area electroluminescence. Issue 26 (21st June 2018)

• Record Type: Journal Article
• Authors: Xu, Man; Wang, Wei-Biao; Bai, Lu-Bing; Yu, Meng-Na; Han, Ya-Min; Lin, Jin-Yi; Zhang, Xin-Wen; Ling, Hai-Feng; Lin, Zong-Qiong; Huang, Ling; Xie, Ling-Hai; Zhao, Jian-Feng; Wang, Jian-Pu; Huang, Wei
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 26(2018)
• Page Start: 7018
• Page End: 7023
• Publication Date: 2018-06-21
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8tc01431k
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Suppression of hierarchical chain aggregation via nano-steric hindrance functionalization is an effective strategy to restrain long-wavelength emission and improving the device performance. Abstract : Suppression of hierarchical chain aggregation in light-emitting π-conjugated polymers (LCPs) is significant for restraining long-wavelength emission and improving the device performance. Herein, for the inhibition of molecular aggregation and the enhancement of luminescence efficiency, a series of multi-dimensional nano-steric units were introduced into supramolecular polyfluorene (PPFOH) by copolymerization, with the aim of integrating the advantages of the nano-steric hindrance effect on molecular emission. The introduction of our nano-steric units can not only effectively disrupt interchain hydrogen-bonding interaction and aggregation but also allow for excellent self-assembly behavior to form zero (nanosphere) and one-dimensional nanowires, similar to DNA molecules. Moreover, the long-wavelength emission at 500–590 nm of PPFOH can be effectively suppressed upon increasing the size and dimension of nano-steric units. Furthermore, larger-area polymer light-emitting diodes (PLEDs) (4 × 4 cm) are fabricated with a tunable electroluminescence (EL) color from orange to yellow, green and blue. These results indicated that nano-steric-hindrance functionalization is a superior and convenient approach to inhibit the interchain aggregation, tune the self-assembly behavior and improve the optoelectronic properties of LCPs.