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

Lim, Soon Kit Julian; Rahamathullah, Rafizah; Sarih, Norazilawati Muhamad; Khairul, Wan M.

doi:10.1016/j.jlumin.2018.05.025

Cited by 15 publications

(6 citation statements)

References 29 publications

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“…The utilization of imine with thiophene and phenanthrene moieties in diode with structure ITO/PEDOT:PSS ? AgNWs/ imine/Al, azomethine with benzofuran unit in device ITO/PEDOT:PSS/10 wt% imine:CBP/TPBI/CsCO 3 / Al and imine containing also acetylene linkage in OLED ITO/imine/Au, lowered turn-on voltage to 10, 8 and 5 V, respectively [15,32,33].…”

Section: Geometric Structure and Frontier Molecular Orbitalsmentioning

confidence: 99%

Symmetrical and unsymmetrical azomethines with thiophene core: structure–properties investigations

et al. 2019

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Unsymmetrical and symmetrical azomethines were obtained using the condensation reaction of diamino-thiophene-3,4 dicarboxylic acid diethyl ester with 4-(1-pyrrolidino)benzaldehyde, fluorene-2-carboxaldehyde, 1-methylindole-3carboxaldehyde, and benzothiazole-2-carboxaldehyde. Their thermal, optical, and electrochemical properties were investigated, and the results were supported by calculations using the density functional theory. The studied compounds melted in the range of 170-260°C and can be converted into amorphous materials with high glass transition temperatures between 76 and 135°C. They were thermally stable up to 220-300°C. All imines were electrochemically active and exhibited low energy band gaps below 2 eV (except for one imine with E g = 2.39 eV) determined on the basis of cyclic voltammetry. Most of the azomethines were emissive in solution and in the solid state. Some of them showed both S 1 (first excited state) emission and S 2 (second excited state) emission or only fluorescence from higher excited state, which is first time observed for azomethines. The imine with the most promising properties was tested in a light-emitting diode, and its ability for emission of light under external voltage was demonstrated.

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Section: Geometric Structure and Frontier Molecular Orbitalsmentioning

confidence: 99%

Symmetrical and unsymmetrical azomethines with thiophene core: structure–properties investigations

et al. 2019

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“…Basically, the experimental spectroscopic data were signi cantly consistent with the theoretical spectroscopic data where the intramolecular charge transfer of electron distribution of the investigated molecule was signi cantly similar. In addition, the theoretical band gap energy (E g ) level of CSAB was calculated as 3.525 eV, which lies in the range of energy band gap semiconductor materials according to their minimal overlapping of HOMO-LUMO with smaller energy for photo-excitation and relaxation [22].…”

Section: Optical Studiesmentioning

confidence: 99%

Theoretical Assessments, Optical and Electrochemical Properties of the Alkoxylated Bischalcone as Emissive Material in Single Layer OLED

Saidin

Khairul

Rahamathullah

et al. 2022

Preprint

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A new bischalcone consisting hexyloxy (-C6H2n + 1) chain based on ‘Donor (D)-π-Donor (D)’ scheme was successfully designed and synthesized to demonstrate as emitting material for single layer OLEDs. Density functional theory assessment (DFT) at B3LYP/6–31G(d,p) were computed to obtain frontier molecular orbitals (FMO), chemical reactivity and molecular electrostatic potential (MEP). The utilization of alkoxy towards the chalcone moiety has increased the solubility and contributed to HOMO-LUMO gap energy level 3.473 eV by UV–vis spectroscopy and were found to have good agreement with theoretical calculations. The investigation on their optical, electrochemical and thermal behaviour also were conducted via UV-Vis, cyclic voltammetry (CV), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The entitled alkoxylated bischalcone (CSAB) revealed good thermal stability up to 300˚C and showed high glass transition temperatures. At positive potential, a quasi-reversible oxidation (Eox 1/2) peak at 2.40 V and negative potentials exhibited reduction peak at 0.78 V, respectively. The application of CSAB was tested in the form thin film in respect of their conductivity of electrical current and electroluminescence behaviour. It gave an intense yellow emission has provided the fundamental understanding on its potentiality featuring alkoxylated bischalcone moiety as solution-processed OLEDs material in optoelectronic interest.

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“…Liquid crystals (LCs) are an attractive class of soft matter having properties somewhere between liquids and solid crystals. LCs have received an overwhelming response due to their very promising applications in various technological fields such as display devices, organic light emitting diodes, anisotropic networks, photoconductors, semiconductor materials, lubricating agents and LC sensors [1][2][3][4][5]. An effective way to develop new low-cost LC material with unique properties is the modification of molecular structure which has proven to be one of the finest strategies [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Mesogenic Properties of New Aromatic Schiff Base’s Esters

Lee,

Chelsea,

et al. 2023

AChJ

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A homologous series of new Schiff base’s esters, 4-bromobenzylidene-4’-alkanoyloxyanilines were syn-thesized. The structure of the synthesized compounds was elucidated using IR and NMR spectroscopic techniques along with mass spectrometric method. Nine homologous members were prepared whereby the length of alkanoyloxy chain, Cn-1H2n-1COO is varied from n = 2, 4, 6, 8, 10, 12, 14, 16 and 18. Their thermotropic properties were analyzed using differential scanning calorimetry and polarized optical mi-croscopy techniques. Whilst short chain members (number of carbons, n = 2, 4) are non-mesogens, member with n = 6 exhibited monotropic smectic A (SmA) phase. As the n increased to 8, this com-pound becomes the only member that exhibited SmA and SmB as enantiotropic phase. Varying from n = 10 to n = 16, these members displayed enantiotropic SmA and monotropic SmB phases. Longest chain member, n-octadecanoyloxy derivatives exhibited only single mesophase (monotropic SmA). The ester linkage and polar terminal (bromo) group in the present series are essential for the smectic polymorphism in Schiff bases

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

Cited by 15 publications

References 29 publications

Symmetrical and unsymmetrical azomethines with thiophene core: structure–properties investigations

Symmetrical and unsymmetrical azomethines with thiophene core: structure–properties investigations

Theoretical Assessments, Optical and Electrochemical Properties of the Alkoxylated Bischalcone as Emissive Material in Single Layer OLED

Synthesis and Mesogenic Properties of New Aromatic Schiff Base’s Esters

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