Title:	Organic electronic applications and charge transport mechanism in novel discotic liquid crystals
Authors:	Pratap Singh, Dharmendra Shah, Asmita Bala, Indu Marichandran, Vadivel Pal, Santanu Kumar Kumar Srivastava, Abhishek Kumar, Sandeep
Keywords:	Discotic liquid crystal Charge transport Charge carrier mobility Time-of-flight technique
Issue Date:	15-Mar-2023
Publisher:	Taylor& Francis Group
Citation:	Liquid Crystals,2023,Vol.50:7-10,p1333
Abstract:	Triphenylene-based pentaalkynylbenzene dyads and naphthophenanthridine derivativediscotic mesogens have been proven a backbone-like utility for modern optoelectronic applications. Herein, we present the charge transport and organic electronic applications of naphthophenanthridine derivatives and a dimer composed of pentaalkynylbenzene (PA) and triphenylene (TP) discotic liquid crystals (DLCs). Naphthophenanthridine derivatives exhibit a hexagonal columnar (Colh) phase; whereas, triphenylene-pentaalkynylbenzene dyads show a columnar centred rectangular (Colr) phase and transform into Colh phase on doping the pure compounds with an electronacceptor 2,4,7-trinitrofluorenone (TNF) in a 2:1 TNF/compound ratio. The ambipolar charge transport behaviour of the compounds mentioned above has been investigated by the time-offlight technique. Naphthophenanthridine derivative renders an ambipolar charge transport, showing temperature-independent electron and hole mobility of the order of 3 × 10−4 cm2/Vs; whereas, TP-PA dimer yields an ambipolar charge carrier mobility of order 10−3 cm2/Vs. The phenazine-fused triphenylene DLC shows unipolar hole mobility of the order of 10−4 cm2/Vs; whereas, hydrogen-bonded Hpz-C9-TP DLCs exhibit ambipolar charge mobility of the order of 10−2 cm2/Vs. The high ambipolar charge carrier mobility in the investigated DLC compounds makes them suitable for fabricating organic semiconducting electronic devices.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/8209
ISSN:	1366-5855(online)
Alternative Location:	http://arxiv.org/abs/cond-mat/ https://doi.org/10.1080/02678292.2023.2188616
Copyright:	2023, The Publisher
Appears in Collections:	Research Papers (SCM)

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