Journal
ADVANCED MATERIALS
Volume 29, Issue 36, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201701346
Keywords
2D; ambipolar transport; charge-transfer complexes; luminescence; organic light-emitting transistors
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Funding
- National Research Foundation of Korea (NRF) through a grant - Korean government (MSIP) [2009-0081571[RIAM0417-20150013]]
- Global Frontier R&D Program on Center for Multiscale Energy System - NRF under the MSIP, Korea [2012M3A6A7055540]
- Spanish Ministerio de Economia y Competitividad [CTQ2014-58801]
- Comunidad de Madrid (Project Mad2D) [S2013/MIT-3007]
- Campus of International Excellence (CEI) UAM+CSIC
- Osaka-Seoul Joint Research Promotion Program, Osaka University
- Grants-in-Aid for Scientific Research [16K17855, 16H00835] Funding Source: KAKEN
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A new 2:1 donor (D):acceptor (A) mixed-stacked charge-transfer (CT) cocrystal comprising isometrically structured dicyanodistyrylbenzene-based D and A molecules is designed and synthesized. Uniform 2D-type morphology is manifested by the exquisite interplay of intermolecular interactions. In addition to its appealing structural features, unique optoelectronic properties are unveiled. Exceptionally high photoluminescence quantum yield (Phi(F) approximate to 60%) is realized by non-negligible oscillator strength of the S-1 transition, and rigidified 2D-type structure. Moreover, this luminescent 2D-type CT crystal exhibits balanced ambipolar transport (mu(h) and mu(e) of approximate to 10(-4) cm(2) V-1 s(-1)). As a consequence of such unique optoelectronic characteristics, the first CT electroluminescence is demonstrated in a single active-layered organic light-emitting transistor (OLET) device. The external quantum efficiency of this OLET is as high as 1.5% to suggest a promising potential of luminescent mixed-stacked CT cocrystals in OLET applications.
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