Slinker, Jason D.

Permanent URI for this collectionhttps://hdl.handle.net/10735.1/3690

Jason Slinker is an Associate Professor of Physics and head of the Slinker Group research laboratory. Dr. Slinker's research interests crisscross two areas: 1) "organic optoelectronic devices for energy efficiency" and 2) "novel biosensors for disease diagnostics and laboratory assays."

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    Enhancement of the Electrical Properties of DNA Molecular Wires Through Incorporation of Perylenediimide DNA Base Surrogates
    (Wiley-vch Verlag, 2019-04-25) Lin, Kuo-Yao; Burke, A.; King, Nolan B.; Kahanda, Dimithree; Mazaheripour, A.; Bartlett, A.; Dibble, D. J.; McWilliams, Mark A.; Taylor, David W.; Jocson, J. -M; Minary-Jolandan, Majid; Gorodetsky, A. A.; Slinker, Jason D.; Lin, Kuo-Yao; King, Nolan B.; Kahanda, Dimithree; McWilliams, Mark A.; Taylor, David W.; Minary-Jolandan, Majid; Slinker, Jason D.
    DNA has long been viewed as a promising material for nanoscale electronics, in part due to its well-ordered arrangement of stacked, pi-conjugated base pairs. Within this context, a number of studies have investigated how structural changes, backbone modifications, or artificial base substitutions affect the conductivity of DNA. Herein, we present a comparative study of the electrical properties of both well-matched and perylene-3,4,9,10-tetracarboxylic diimide (PTCDI)-containing DNA molecular wires that bridge nanoscale gold electrodes. By performing current-voltage measurements for such devices, we find that the incorporation of PTCDI DNA base surrogates within our macromolecular constructs leads to an approximately 6-fold enhancement in the observed current levels. Together, these findings suggest that PTCDI DNA base surrogates may enable the preparation of designer DNA-based nanoscale electronic components. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
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    Ionic Organic Small Molecules as Hosts for Light-Emitting Electrochemical Cells
    (American Chemical Society) Moore, M. D.; Bowler, Melanie H.; Reynolds, J. E.; Lynch, V. M.; Shen, Yulong; Slinker, Jason D.; Sessler, J. L.; 0000-0001-7338-586X (Slinker, JD); Bowler, Melanie H.; Shen, Yulong; Slinker, Jason D.
    Light-emitting electrochemical cells (LEECs) from ionic transition-metal complexes (iTMCs) offer the potential for high-efficiency electroluminescence in a simple, single-layer device. However, LEECs typically rely on the use of rare metal complexes. This has limited their cost effectiveness and put constraints on their applicability. With a view to leveraging the efficient emission of these complexes while mitigating costs, we describe here a host/guest LEEC strategy that relies on the use of carbazole (Cz)-based organic small-molecule hosts and iTMC guests. Three cationic host molecules were prepared via the coupling of 1-(4-bromophenyl)-2-phenylbenzimidazole (PBI-Br) with Cz. This has allowed a comparison between the hosts bearing methoxy (PBI-CzOMe) and tert-butyl (PBI-CztBu) substituents, as well as an unsubstituted analogue (PBI-CzH). Cyclic voltammetry and UV-visible absorption revealed that all three host materials have wide band gaps characterized by reversible oxidation and irreversible reduction events. On the basis of electronic structure calculations, the host highest occupied molecular orbital (HOMO) resides primarily on the Cz moiety, whereas the lowest unoccupied molecular orbital (LUMO) is located primarily on the phenyl-benzimidazolium unit. Photoluminescence analysis of thin-film blends of PBI-CzH with iTMC guests confirmed that the emission was blue-shifted relative to pristine iTMC films, which is consistent with what was seen in dilute dichloromethane solution. LEEC devices were prepared based on thin films of the pristine hosts, pristine guests, and 90%/10% (w/w) host/guest blends. Among these host/guest blends, LEECs based on PBI-CzH displayed the best performance, particularly when an iridium complex was used as the guest. The system in question yielded a luminance maximum of 624 cd/m2 at an external quantum efficiency of 3.80%. This result stands in contrast to what is seen with typical organic light-emitting diode host studies, where tert-butyl substitution of the host generally leads to a better performance. To rationalize the present observations, the host materials were subject to single-crystal X-ray diffraction analysis. The resulting structures revealed clear head-to-tail interactions in the case of both PBI-CzH and PBI-CzOMe. No such interactions were evident in the case of PBI-CztBu. Furthermore, PBI-CzH showed a relatively smaller spacing between the successive HOMO and successive LUMO levels relative to PBI-CzOMe and PBI-CztBu, a finding consistent with more favorable charge transport and energy transfer. The results presented here can help inform the design and preparation of host materials suitable for use in single-layer iTMC LEECs.
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    Blue Light Emitting Electrochemical Cells Incorporating Triazole-based Luminophores
    (2013-09-20) Fernández-Hernández, Jesús M.; Ladouceur, S.; Shen, Y.; Iordache, A.; Wang, X.; Donato, L.; Gallagher-Duval, S.; de Anda Villa, Manuel; Slinker, Jason D.; De Cola, L.; Zysman-Colman, E.; 0000 0001 2791 9795 (Slinker, JD); Slinker, Jason D.
    We report the electrochemical, photoluminescence, and electroluminescence properties of four fluorinated cationic iridium complexes bearing pyridyltriazole ancillary ligands. All the complexes display unstructured emission in the true blue region at 298 K with photoluminescent λem ranging from 452 to 487 nm in acetonitrile solution, in powder and in PMMA doped thin films. The nature of the emission is a mixed metal-to-ligand/ligand-to-ligand charge transfer state. Photoluminescence (PL) quantum efficiencies both in solution and in the solid state were low while excited state decay kinetics were found to be multiexponential. Each complex undergoes quasi-reversible oxidation and irreversible reduction with large HOMO-LUMO gaps. A detailed computational investigation corroborates the spectroscopic assignments. Additionally, light-emitting electrochemical cells (LEECs) were fabricated for each of the four complexes. The electroluminescence (EL) spectra of all complexes were red-shifted relative to the PL spectra. The LEEC containing 2a is the bluest emitter (λmax = 487 nm) of the family of complexes.

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