Tailoring tail-free nematogen of ethynylated-schiff base and its evaluation as solution-processable OLED emitting material

Lim, Soon Kit Julian and Rahamathullah, Rafizah and Sarih, Norazilawati Muhamad and Khairul, Wan Mohd (2018) Tailoring tail-free nematogen of ethynylated-schiff base and its evaluation as solution-processable OLED emitting material. Journal of Luminescence, 201. pp. 397-401. ISSN 0022-2313

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Official URL: https://doi.org/10.1016/j.jlumin.2018.05.025

Abstract

A new rigid core dye comprised ESB-NO2 of chromophore moieties of acetylide (C≡C), Schiff base (C˭N) and nitro (NO2) was successfully synthesized to demonstrate tail-free nematogen as emitting material for organic light-emitting diode (OLED). The relationship between liquid crystal molecular structure, phase transition temperature and electroluminescence behaviour were evaluated. The mesomorphic properties of ESB-NO2 were identified via polarized optic microscopy (POM) which displayed nematic phase of Schlieren textures and their corresponding transition enthalpies were respectively recorded at 25.15 kJ mol−1. The photoluminescence behaviours of ESB-NO2 have been verified at λem,max = 538 nm where this emission are for its π→π * transition, intramolecular charge transfer (ICT) absorptions and fluoresce characters. Having ESB-NO2 as liquid crystalline material, OLED was constructed featuring single-layer indium tin oxide (ITO) coated substrate/ESB-NO2/Au via solution-casting method. The result revealed the single layer ESB-NO2 film displayed satisfactory electroluminescence with intense yellow emission under different direct current (DC) voltages supply. These findings indicate the practicability of designing tail-free nematogenic compounds as promising solution-processed OLED materials.

Item Type: Article
Uncontrolled Keywords: Acetylide; Schiff base; Chromophore; Liquid crystals; OLEDs
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: Faculty of Science > Dept of Chemistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 31 May 2019 02:35
Last Modified: 31 May 2019 02:35
URI: http://eprints.um.edu.my/id/eprint/21434

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