Heteroatomic Conjugated Polymers and the Spectral Tuning of Electroluminescence via a Supramolecular Coordination Strategy

Jinyi Lin, Bin Liu, Mengna Yu, Linghai Xie, Wensai Zhu, Haifeng Ling, Xinwen Zhang, Xuehua Ding, Xuhua Wang, Paul N. Stavrinou, Jianpu Wang, Donal D.C. Bradley, Wei Huang

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The unique electronic structures of heteroatomic conjugated polymers (HCPs) offer an attractive platform to tune optoelectronic properties via a supramolecular coordination strategy. This study reports on an sp2 nitrogen heteroatom containing fluorene-based copolymer namely poly(9,9-dioctylfluorene-co-9,9-dioctyldiazafluoren-2,7-yl) (PF8-co-DAF8), with ≈20% DAF8 units. Tuning the optoelectronic properties of PF8-co-DAF8 via supramolecular coordination with a Lewis acid (B(C6F5)3 or AlCl3) is explored. Formation of either the PF8-co-DAF8-B(C6F5)3 or PF8-co-DAF8-AlCl3 adducts reduces the optical gap and causes an attendant redshift of the photoluminescence spectra. Controlling the degree and strength of the coordination allows the emission color to be tuned from blue through to green and yellow. This strategy is successfully implemented for polymer light-emitting diodes, confirming the large degree of spectral tuning whilst maintaining good device performance. Maximum luminous efficiencies, η ≈ 1.55 cd A−1@ 2120 cd m−2, 1.32 cd A−1@ 1424 cd m−2, and 2.56 cd A−1@ 910 cd m−2 are, respectively, recorded for the blue-emitting diodes with Commission Internationale de L'Eclairage (CIE) (x, y) coordinates = (0.16, 0.16), the white-emitting diodes with CIE (x, y) = (0.28, 0.38) and the green-emitting diodes with CIE (x, y) = (0.33, 0.52). The results highlight the versatility of the supramolecular coordination strategy in modifying the electronic structure of HCPs. (Figure presented.).
Original languageEnglish (US)
JournalMacromolecular Rapid Communications
Volume37
Issue number22
DOIs
StatePublished - Nov 1 2016
Externally publishedYes

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