ORCID Profile
0000-0002-6141-5109
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Nanomaterials | Medical Biotechnology | Logistics and Supply Chain Management | Physical Chemistry of Materials | Functional Materials | Macromolecular and Materials Chemistry | Synthesis of Materials | Biomaterials | Materials Engineering | Physical Chemistry (Incl. Structural) | Structural Chemistry and Spectroscopy | Regenerative Medicine (incl. Stem Cells and Tissue Engineering) | Nonlinear Optics and Spectroscopy | Molecular and Organic Electronics |
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Technology | Solar-Photovoltaic Energy | Polymeric Materials (e.g. Paints) | Technological and Organisational Innovation | Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Human Pharmaceutical Products not elsewhere classified | Expanding Knowledge in the Medical and Health Sciences
Related Links
Publications
Photodetection efficiency enhancement of IR sensitive organic photodetectors via triplet energy transfer
Publisher: Elsevier BV
Date: 10-2019
Photo-Cross-Linkable Polymer Inks for Solution-Based OLED Fabrication
Publisher: American Chemical Society (ACS)
Date: 15-11-2019
Sulfonated Mesoporous Silica as Proton Exchanging Layer in Solid‐State Organic Transistor
Publisher: Wiley
Date: 05-10-2017
p-n junction organic photovoltaics fabricated by all solution processing
Publisher: Elsevier BV
Date: 2012
Enhancing current density using vertically oriented organic photovoltaics
Publisher: Elsevier BV
Date: 06-2012
Flexible Ink‐Jet Printed Polymer Light‐Emitting Diodes using a Self‐Hosted Non‐Conjugated TADF Polymer
Publisher: Wiley
Date: 26-04-2023
Abstract: Thermally activated delayed fluorescent (TADF) emitters have become the leading emissive materials for highly efficient organic light‐emitting diodes (OLEDs). The deposition of these materials in scalable and cost‐effective ways is paramount when looking toward the future of OLED applications. Herein, a simple OLED with fully solution‐processed organic layers is introduced, where the TADF emissive layer is ink‐jet printed. The TADF polymer has electron and hole conductive side chains, simplifying the fabrication process by removing the need for additional host materials. The OLED has a peak emission of 502 nm and a maximum luminance of close to 9600 cd m −2 . The self‐hosted TADF polymer is also demonstrated in a flexible OLED, reaching a maximum luminance of over 2000 cd m −2 . These results demonstrate the potential applications of this self‐hosted TADF polymer in flexible ink‐jet printed OLEDs and, therefore, for a more scalable fabrication process.
Emissive semi-interpenetrating polymer networks for ink-jet printed multilayer OLEDs
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1PY00794G
Abstract: Solution-processing of multi-layered Organic Light Emitting Diodes (OLEDs) remains challenging. Herein, we introduce a facile blending process of emitting polymers with photoreactive polymer strands, allowing for the generation of solvent resistant emissive layers.
Stable organic photovoltaics using Ag thin film anodes
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM15670A
ITO-free top emitting organic light emitting diodes with enhanced light out-coupling
Publisher: Wiley
Date: 06-11-2013
Pathway to high throughput, low cost indium-free transparent electrodes
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA03248B
Abstract: A high throughput process is reported for the production of a highly conductive, transparent planar electrode comprising of silver nanowires and single walled carbon nanotubes imbedded into PEDOT:PSS.
Room-temperature tilted-target sputtering deposition of highly transparent and low sheet resistance Al doped ZnO electrodes
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TC00695C
Abstract: OPV devices comprised of AZO electrodes with sheet resistances of Ω □ −1 and transmittance in the visible region up to an average of 84% showed comparable performance to devices with a transparent ITO electrode.
Formation of highly conductive composite coatings and their applications to broadband antennas and mechanical transducers
Publisher: Springer Science and Business Media LLC
Date: 09-2010
Abstract: Tight networks of interwoven carbon nanotube bundles are formed in our highly conductive composite. The composite possesses properties suggesting a two-dimensional percolative network rather than other reported dispersions displaying three-dimensional networks. Binding nanotubes into large but tight bundles dramatically alters the morphology and electronic transport dynamics of the composite. This enables it to carry higher levels of charge in the macroscale leading to conductivities as high as 1600 S/cm. We now discuss in further detail, the electronic and physical properties of the nanotube composites through Raman spectroscopy and transmission electron microscopy analysis. When controlled and used appropriately, the interesting properties of these composites reveal their potential for practical device applications. For instance, we used this composite to fabricate coatings, which improve the properties of an electromagnetic antenna/ lifier transducer. The resulting transducer possesses a broadband range up to GHz frequencies. A strain gauge transducer was also fabricated using changes in conductivity to monitor structural deformations in the composite coatings.
A highly porous and conductive composite gate electrode for OTFT sensors
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9RA00148D
Abstract: A porous and conductive gate electrode of PEDOT:PSS and sulphonated mesoporous silica nanoparticles is investigated for organic thin film transistor sensors.
p-n junction organic photovoltaics fabricated by all solution processing (vol 161, pg 2798, 2012)
Publisher: Elsevier BV
Date: 09-2012
Highly Sensitive Capacitive Low-Pressure Graphene Porous Foam Sensors
Publisher: American Chemical Society (ACS)
Date: 11-08-2022
Effect of thermal annealing Super Yellow emissive layer on efficiency of OLEDs
Publisher: Springer Science and Business Media LLC
Date: 20-01-2017
DOI: 10.1038/SREP40805
Abstract: Thermal annealing of the emissive layer of an organic light emitting diode (OLED) is a common practice for solution processable emissive layers and reported annealing temperatures varies across a wide range of temperatures. We have investigated the influence of thermal annealing of the emissive layer at different temperatures on the performance of OLEDs. Solution processed polymer Super Yellow emissive layers were annealed at different temperatures and their performances were compared against OLEDs with a non-annealed emissive layer. We found a significant difference in the efficiency of OLEDs with different annealing temperatures. The external quantum efficiency (EQE) reached a maximum of 4.09% with the emissive layer annealed at 50 °C. The EQE dropped by ~35% (to 2.72%) for OLEDs with the emissive layers annealed at 200 °C. The observed performances of OLEDs were found to be closely related to thermal properties of polymer Super Yellow. The results reported here provide an important guideline for processing emissive layers and are significant for OLED and other organic electronics research communities.
Detection of H2O2 with Hygroscopic Insulator Organic Thin Film Transistor
Publisher: Wiley
Date: 30-12-2021
Abstract: Hygroscopic insulator field effect transistors (HIFETs) are a class of solid‐state, low‐voltage organic thin film transistors with promising sensitivity to hydrogen peroxide (H 2 O 2 ). While work has progressed on the development and understanding of HIFET‐based sensors, important questions regarding the fundamental H 2 O 2 sensing mechanisms need to be fully investigated. In this work, a detailed study of the effects of H 2 O 2 on the transient drain currents and transfer characteristics of HIFETs, while varying analyte concentrations and device voltages, is presented. The sensing mechanism is found to be consistent with the direct oxidation of the organic semiconductor channel, poly(3‐hexylthiophene‐2,5‐diyl), by H 2 O 2 diffused into the device through the permeable top gate electrode and hygroscopic insulator. Further, the importance of having a transistor structure in sensing H 2 O 2 , as compared to a two‐terminal device, is demonstrated. These results represent important progress in the understanding of HIFET‐based sensors, revealing paths for future applications and optimization.
Effect of Gate Conductance on Hygroscopic Insulator Organic Field-Effect Transistors
Publisher: Wiley
Date: 26-03-2020
Effect of humidity on melt electrospun polycaprolactone scaffolds
Publisher: Walter de Gruyter GmbH
Date: 2016
Abstract: Direct write melt electrospinning is an additive manufacturing technique used to produce 3D polymer scaffolds for tissue engineering applications. It is similar to conventional 3D printing by layering 2D patterns to build up an object, but uses a high-electric potential to draw out fibres into micron-scale diameters with great precision. Direct write melt electrospinning is related to a well-established fabrication technique, solution electrospinning, but extrudes a melted polymer in a controlled manner rather than a polymer solution. The effect of environmental conditions such as humidity has been extensively studied in the context of solution electrospinning however, there is a lack of similar studies for direct write melt electrospinning. In this study, melt electrospun polycaprolactone scaffolds were produced with 90 degree cross-hatch architecture at three specific humidity [
A printable thermally activated delayed fluorescence polymer light emitting diode
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TC02735A
Abstract: We report the first ink-jet printed thermally activated delayed fluorescence (TADF) polymer organic light emitting diode (OLED).
Triplet energy transfer and triplet exciton recycling in singlet fission sensitized organic heterojunctions
Publisher: SPIE
Date: 25-08-2017
DOI: 10.1117/12.2273804
Planar silver nanowire, carbon nanotube and PEDOT:PSS nanocomposite transparent electrodes
Publisher: Informa UK Limited
Date: 23-03-2015
Design and fabrication of linear pixel arrays for organic photovoltaic modules to achieve scalable power output
Publisher: Elsevier BV
Date: 03-2011
Spectral changes associated with transmission of OLED emission through human skin
Publisher: Springer Science and Business Media LLC
Date: 08-07-2019
DOI: 10.1038/S41598-019-45867-9
Abstract: A recent and emerging application of organic light emitting diodes (OLEDs) is in wearable technologies as they are flexible, stretchable and have uniform illumination over a large area. In such applications, transmission of OLED emission through skin is an important part and therefore, understanding spectral changes associated with transmission of OLED emission through human skin is crucial. Here, we report results on transmission of OLED emission through human skin s les for yellow and red emitting OLEDs. We found that the intensity of transmitted light varies depending on the site from where the skin s les are taken. Additionally, we show that the amount of transmitted light reduces by ~ 35–40% when edge emissions from the OLEDs are blocked by a mask exposing only the light emitting area of the OLED. Further, the emission/electroluminescence spectra of the OLEDs widen significantly upon passing through skin and the full width at half maximum increases by nm and nm for yellow and red OLEDs, respectively. For comparison, emission profile and intensities of transmitted light for yellow and red inorganic LEDs are also presented. Our results are highly relevant for the rapidly expanding area of non-invasive wearable technologies that use organic optoelectronic devices for sensing.
Direct-write crosslinking in vacuum-deposited small-molecule films using focussed ion and electron beams
Publisher: IOP Publishing
Date: 21-05-2019
Abstract: Recent advances in helium ion microscopy (HIM) have enabled the use of fine-focused He
PEDOT:PSS hydrogel gate electrodes for OTFT sensors
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TC01096H
Abstract: PEDOT:PSS hydrogel is used as soft, conductive gate electrodes for low-voltage hygroscopic insulator field effect transistors (HIFETs). HIFETs are sensitive to aqueous solutions of KCl, NaCl and H 2 O 2 , introduced through the hydrogel gate electrode.
Inkjet‐Printed Self‐Hosted TADF Polymer Light‐Emitting Diodes
Publisher: Wiley
Date: 19-07-2022
Abstract: Thermally activated delayed fluorescent (TADF) materials are extensively investigated as organic light‐emitting diodes (OLEDs) with TADF emitting layers demonstrating high efficiency without the use of heavy metal complexes. Therefore, solution‐processable and printable TADF emitters are highly desirable, moving away from expensive vacuum deposition techniques. In addition, using emissive materials not requiring an external host simplifies the fabrication process significantly. Herein, OLEDs using a solution‐processable TADF polymer that do not need an external host are introduced. The non‐conjugated TADF polymer features a TADF emitter (4‐(9H‐carbazol‐9‐yl)‐2‐(3′‐hydroxy‐[1,1′‐biphenyl]‐3‐yl)‐isoindoline‐1,3‐dione) as a side chain, as well as a hole‐transporting side chain and an electron‐transporting side chain on an inactive polymer backbone. All organic layers of the OLEDs are fabricated using solution processing methods. The OLEDs with inkjet‐printed emissive layers have comparable maximum current and external quantum efficiency as their spin‐coated counterparts, exceeding luminance of 2000 cd m −2 . The herein‐explored strategy is a viable route toward self‐hosted printable TADF OLEDs.
Improved sensitivity of P3HT-based photo-transistors blended with perovskite nanocrystals
Publisher: Elsevier BV
Date: 03-2023
Insight into OTFT Sensors Using Confocal Fluorescence Microscopy.
Publisher: American Chemical Society (ACS)
Date: 21-01-2022
Abstract: Confocal fluorescence microscopy provides a means to map charge carrier density within the semiconductor layer in an active organic thin film transistor (OTFT). This method exploits the inverse relationship between charge carrier density and photoluminescence (PL) intensity in OTFTs, originating from exciton quenching following exciton-charge energy transfer. This work demonstrates that confocal microscopy can be a simple yet effective approach to gain insight into doping and de-doping processes in OTFT sensors. Specifically, the mechanisms of hydrogen peroxide sensitivity are studied in low-voltage hygroscopic insulator field effect transistors (HIFETs). While the sensitivity of HIFETs to hydrogen peroxide is well known, the underlying mechanisms remain poorly understood. Using confocal microscopy, new light is shed on these mechanisms. Two distinct doping processes are discerned: one that occurs throughout the semiconductor film, independent of applied voltages and a stronger doping effect occurring near the source electrode, when acting as an anode with respect to a negatively polarized drain electrode. These insights offer important guidance to future studies and the optimization of HIFET-based sensors. More importantly, the methods reported here are broadly applicable to the study of a range of OTFT-based sensors. This work demonstrates that confocal microscopy can be an effective research tool in this field.
A simplified approach to thermally activated delayed fluorescence (TADF) bipolar host polymers
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2PY00511E
Abstract: Herein, we compare a series of solution-processible TADF polymers with different host pendant groups to achieve balanced charge transport properties through the combination of unipolar co-hosts.
Defining the light emitting area for displays in the unipolar regime of highly efficient light emitting transistors
Publisher: Springer Science and Business Media LLC
Date: 06-03-2015
DOI: 10.1038/SREP08818
Abstract: Light-emitting field effect transistors (LEFETs) are an emerging class of multifunctional optoelectronic devices. It combines the light emitting function of an OLED with the switching function of a transistor in a single device architecture. The dual functionality of LEFETs has the potential applications in active matrix displays. However, the key problem of existing LEFETs thus far has been their low EQEs at high brightness, poor ON/OFF and poorly defined light emitting area - a thin emissive zone at the edge of the electrodes. Here we report heterostructure LEFETs based on solution processed unipolar charge transport and an emissive polymer that have an EQE of up to 1% at a brightness of 1350 cd/m 2 , ON/OFF ratio 10 4 and a well-defined light emitting zone suitable for display pixel design. We show that a non-planar hole-injecting electrode combined with a semi-transparent electron-injecting electrode enables to achieve high EQE at high brightness and high ON/OFF ratio. Furthermore, we demonstrate that heterostructure LEFETs have a better frequency response ( f cut-off = 2.6 kHz ) compared to single layer LEFETs. The results presented here therefore are a major step along the pathway towards the realization of LEFETs for display applications.
Organic photovoltaics using thin gold film as an alternative anode to indium tin oxide
Publisher: Elsevier BV
Date: 07-2011
Facile and Dynamic Color-Tuning Approach for Organic Light-Emitting Diodes Using Anisotropic Filters
Publisher: American Chemical Society (ACS)
Date: 27-06-2018
Flexible Ag electrode for use in organic photovoltaics
Publisher: Elsevier BV
Date: 07-2011
Designs and Architectures for the Next Generation of Organic Solar Cells
Publisher: MDPI AG
Date: 14-06-2010
DOI: 10.3390/EN3061212
Graphene Porous Foams for Capacitive Pressure Sensing
Publisher: American Chemical Society (ACS)
Date: 31-01-2022
Simultaneous Enhancement of Brightness, Efficiency, and Switching in RGB Organic Light Emitting Transistors
Publisher: Wiley
Date: 20-08-2013
Abstract: An innovative design strategy for light emitting field effect transistors (LEFETs) to harvest higher luminance and switching is presented. The strategy uses a non-planar electrode geometry in tri-layer LEFETs for simultaneous enhancement of the key parameters of quantum efficiency, brightness, switching, and mobility across the RGB color gamut.
A triphenylamine substituted quinacridone derivative for solution processed organic light emitting diodes
Publisher: Elsevier BV
Date: 02-2018
Singlet Fission and Triplet Exciton Dynamics in Rubrene/Fullerene Heterojunctions: Implications for Electroluminescence
Publisher: Wiley
Date: 28-10-2015
Optogenetic stimulation and spatial localization of neurons using a multi-OLED approach
Publisher: American Chemical Society (ACS)
Date: 20-09-2022
Stable crosslinked gate electrodes for hygroscopic insulator OTFT sensors
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TC00862E
Abstract: We report methods for fabricating stable PEDOT:PSS gate electrodes for hygroscopic insulator field effect transistors for sensing applications. Crosslinkers DVS and GOPS are used, and the challenges and advantages of each are demonstrated.
Optimization of organic solar cells with thin film Au as anode
Publisher: Elsevier BV
Date: 08-2011
Efficient and bright polymer light emitting field effect transistors
Publisher: Elsevier BV
Date: 02-2015
Vinylene and benzo[c][1,2,5]thiadiazole: effect of the π-spacer unit on the properties of bis(2-oxoindolin-3-ylidene)-benzodifuran-dione containing polymers for n-channel organic field-effect t
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8RA08890J
Abstract: Bottom-gate-top-contact OFET device structure using PBIBDF-TVT and PBIBDF-TBT based polymer semiconductors.
New microscale vertically oriented organic photovoltaics cells
Publisher: IEEE
Date: 06-2010
Optimized multilayer indium-free electrodes for organic photovoltaics
Publisher: Wiley
Date: 09-10-2014
AZO/Ag/AZO anode for resonant cavity red, blue, and yellow organic light emitting diodes
Publisher: AIP Publishing
Date: 24-06-2016
DOI: 10.1063/1.4954689
Abstract: Indium tin oxide (ITO) is the transparent electrode of choice for organic light-emitting diodes (OLEDs). Replacing ITO for cost and performance reasons is a major drive across optoelectronics. In this work, we show that changing the transparent electrode on red, blue, and yellow OLEDs from ITO to a multilayer buffered aluminium zinc oxide/silver/aluminium zinc oxide (AZO/Ag/AZO) substantially enhances total output intensity, with better control of colour, its constancy, and intensity over the full exit hemisphere. The thin Ag containing layer induces a resonant cavity optical response of the complete device. This is tuned to the emission spectra of the emissive material while minimizing internally trapped light. A complete set of spectral intensity data is presented across the full exit hemisphere for each electrode type and each OLED colour. Emission zone modelling of output spectra at a wide range of exit angles to the normal was in excellent agreement with the experimental data and hence could, in principle, be used to check and adjust production settings. These multilayer transparent electrodes show significant potential for both eliminating indium from OLEDs and spectrally shaping the emission.
Related Organisations
Related Funding Activities
Linkage Projects - Grant ID: LP170100387
Start Date: 01-2018
End Date: 06-2022
Amount: $159,916.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE220100034
Start Date: 2022
End Date: 12-2023
Amount: $817,476.00
Funder: Australian Research Council
View Funded ActivityIndustrial Transformation Training Centres - Grant ID: IC190100026
Start Date: 01-2021
End Date: 11-2027
Amount: $4,969,663.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE210100124
Start Date: 07-2021
End Date: 06-2024
Amount: $538,590.00
Funder: Australian Research Council
View Funded Activity