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Highly Luminescent 2D‐Type Slab Crystals Based on a Molecular Charge‐Transfer Complex as Promising Organic Light‐Emitting Transistor Materials
Author(s) -
Park Sang Kyu,
Kim Jin Hong,
Ohto Tatsuhiko,
Yamada Ryo,
Jones Andrew O. F.,
Whang Dong Ryeol,
Cho Illhun,
Oh Sangyoon,
Hong Seung Hwa,
Kwon Ji Eon,
Kim Jong H.,
Olivier Yoann,
Fischer Roland,
Resel Roland,
Gierschner Johannes,
Tada Hirokazu,
Park Soo Young
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201701346
Subject(s) - materials science , ambipolar diffusion , luminescence , electroluminescence , optoelectronics , photoluminescence , organic field effect transistor , acceptor , intermolecular force , transistor , charge (physics) , quantum yield , molecule , nanotechnology , field effect transistor , condensed matter physics , optics , chemistry , physics , plasma , organic chemistry , layer (electronics) , quantum mechanics , voltage , fluorescence
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 ( Φ F ≈ 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 ( µ h and µ e of ≈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.