The rapid detection of disease specific biomarkers in a clinically relevant range using a low-cost sensor can facilitate the development of individual treatment plans for a given patient, known as precision, personalized or genomic medicine. In the recent decade Electrolyte-Gated Organic Field Effect Transistors (EGOFETs), a subtype of OFETs where the dielectric is replaced by an electrolyte, have attracted a great deal of attention for sensing applications. This is due to their capacity to operate at low voltage (< 1 volt) in physiological like media. Although EGOFET based biosensors have been shown to specifically detect biomolecules with high sensitivity and selectivity; the stability, reproducibility, and performance required to reach the desired market are not yet achieved. In this contribution, we describe the development of a stable and reproducible EGOFET sensor that is able to detect biomolecules selectively in real-time. Facile and scalable techniques are used to prepare arrays of these devices. The selectivity of individual EGOFETs is investigated by immobilization of specific ligands to the target molecule of interest on the gate electrode within a microfluidic flow cell.
We demonstrate the performance of thin film transistor devices based on a solution processable organic semiconductor
with a field effect mobility of up to
2.5cm2V-1s-1. The performance of the material is demonstrated in a top gate, bottom
contact device architecture operational in air without the requirement for device encapsulation. From a device
performance aspect, we also highlight the influence that contact resistance has on the mobility.
A device structure that enables the combination of phosphorescent green and fluorescent blue emitters in a solution processed polymer organic light-emitting diode device has been developed. Results demonstrate that it is possible to tune the color of emission by appropriate formulation of the polymers that are used. This enabled the development of a warm white device that had CIE coordinates of (0.462, 0.426), and an external quantum efficiency (EQE) of 13.1%. This EQE was limited by the efficiencies of the emitters used rather than through any internal quenching, and thus the device structure offers potential for further development.
High performance short channel OTFTs with field effect mobilities greater than 1cm2V-1s-1 have been developed for
OLED driver applications incorporating soluble crystalline semiconductor materials. We highlight the impact of contact
resistance on the mobility in these devices and show by functionalising both the source and drain contacts and channel
regions in a top gate bottom contact device architecture that the mobility can be significantly improved. Our approach
also includes the optimisation of solvent selection from which the semiconductor material is deposited in order to
enhance crystalline domain formation.
When a blue polymer OLED device is driven under DC constant current the electroluminescence decays over time. Over the last two years there have been large advances in the time taken for the luminescence to fall to 50% of its original value. This is in part due to an improved recognition and understanding of the degradation mechanisms involved in the luminescence decay. Measurements made from devices during lifetest have identified a number of characteristic degradation-related changes to the device and to the light-emitting polymer. In this paper we will compare these degradation signatures together with the material properties between light-emitting polymers which have been designed to give a long DC-driven lifetime and a class of polymers which have been specifically designed to give a long lifetime under pulsed driving schemes.
Conference Committee Involvement (4)
Organic Light Emitting Materials and Devices XVII
25 August 2013 | San Diego, California, United States
Organic Light Emitting Materials and Devices XVI
12 August 2012 | San Diego, California, United States
Organic Light Emitting Materials and Devices XV
21 August 2011 | San Diego, California, United States
Organic Light Emitting Materials and Devices XIV
1 August 2010 | San Diego, California, United States
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