Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201705609
Keywords
aggregation-induced emission; near-infrared emission; organic field-effect transistors; perylenediimide; tetraphenylethylene
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Funding
- Innovation and Technology Commission [ITC-CNERC14SC01, ITCPD/17-9]
- National Basic Research Program of China (973 Program) [2013CB834701, 2013CB834702]
- University Grants Committee of Hong Kong [AoE/P-03/08]
- Research Grants Council of Hong Kong [16305015, 16308016, A-HKUST605/16, C2014-15G]
- Shenzhen Science and Technology Program [JCYJ20160509170535223]
- Shenzhen Peacock Plan
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Organic materials with both high electron mobility and strong solid-state emission are rare although for their importance to advanced organic optoelectronics. In this paper, triphenylethylenes with varying number of perylenediimide (PDI) unit (TriPE-nPDIs, n = 1-3) are synthesized and their optical and charge-transporting properties are systematically investigated. All the molecules exhibit strong solid-stated near infrared (NIR) emission and some of them exhibit aggregation-enhanced emission characteristics. Organic field-effect transistors (OFETs) using TriPE-nPDIs are fabricated. TriPE-3PDI shows the best performance with maximum quantum yield of approximate to 30% and optimized electron mobility of over 0.01 cm(2) V-1 s(-1), which are the highest values among aggregation-induced emission luminogens with NIR emissions reported so far. Photophysical property investigation and theoretical calculation indicate that the molecular conformation plays an important role on the optical properties of TriPE-nPDI, while the result from film microstructure study reveals that the film crystallinity influences greatly their OFET device performance.
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