Strategies to Enhance the Electrochromic Properties of Conjugated Polymers Bearing Pyromellitic Diimide Acceptors

Author:

Hui Bryan Yat Kit12ORCID,Chin Kang Le Osmund1ORCID,Lim Jovan Jun Long34,Soo Xiang Yun Debbie3ORCID,Lu Xuehong4ORCID,Zhu Qiang3ORCID,Liu Xiaogang2ORCID,Xu Jianwei15ORCID,Chua Ming Hui1ORCID

Affiliation:

1. Institute of Sustainability for Chemicals, Energy and Environment (ISCE2) Agency for Science, Technology and Research (A*STAR) Singapore 1 Pesek Road, Jurong Island Singapore 627833

2. Science, Math and Technology Cluster Singapore University of Technology and Design (SUTD) Singapore 8 Somapah Road Singapore 487372

3. Institute of Materials Research and Engineering (IMRE) Agency for Science, Technology and Research (A*STAR) Singapore 2 Fusionopolis Way, Innovis, #08-03 Singapore 138634

4. School of Materials Science and Engineering (MSE) Nanyang Technological University (NTU) Singapore Block N4.1, 50 Nanyang Avenue Singapore 639798

5. Department of Chemistry National University of Singapore (NUS) Singapore 3 Science Drive 3 Singapore 117543

Abstract

AbstractA series of conjugated polymers bearing thiophene‐based donors and pyromellitic diimide (PMDI) acceptor were prepared, and their electrochromic (EC) properties were studied via using fabricated thin‐film EC devices. It was observed that structurally regular alternating polymers with fewer (1 and 2) thiophene donors do not exhibit any EC properties while increasing the number of donors eventually led to the emergence of orange‐red‐to‐green colour switching. On this basis, two more random co‐polymers containing higher donor‐to‐acceptor ratios were synthesized to further improve EC switching properties. The two polymers, which bear a PMDI‐to‐thiophene ratio of ca. 1 : 7 and 1 : 8, revealed orange red‐to‐blue colour switching and generally improved optical contrasts and switching speeds in both the visible and near infra‐red (NIR) region. In addition, the subtle modulation of polymer colour and hue via variation of the number of thiophene donors was evident through colorimetric study. This work therefore demonstrates the potential and possibility of using the PMDI acceptor unit to construct EC‐active conjugated polymers, and considerations for future tuning of colour and switching performances.

Funder

Agency for Science, Technology and Research

Publisher

Wiley

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