Organic photodetectors (OPDs) hold great promise for use in flexible electronics as they can be designed on substrates featuring various shapes and using cost-effective solution-processed methods. Organic conjugated materials offering two or more distinct optoelectronic functions are especially appealing here as they provide multifunctionality while also retaining the ease of fabrication and low-cost advantage. One such material is TPA-azaBODIPY-TPA that has been shown to feature ideal charge transfer properties and excitation energy levels. In our recent work, we demonstrated the versatile nature of this material acting as either a charge transport interlayer in perovskite solar cells, or as a light-absorbing layer in OPDs. TPA-azaBODIPY-TPA-based solar cellsshowed a 60 % increase in power conversion efficiency when compared to a control device using a conventional interlayer PEDOT:PSS. Having also demonstrated the successful utilization of TPA-azaBODIPY-TPA in OPDs manufactured on glass substrates, we further explore its applications in the design and fabrication of flexible OPDs for near-infrared sensing. Fabricated devices on flexible substrates show a near-infrared spectral responsivity of 49 mA W-1 at 730 nm, a high linear dynamic range of 110 dB and fast temporal responses below 100 μs. With robust thermal stability as well as excellent solubility and processability, TPA-azaBODIPY-TPA is found to be perfect candidate for the next-generation of smart optoelectronic flexible devices.
Organic light emitting diodes (OLEDs) are thin, lightweight and flexible whilst still maintaining high efficiencies. Therefore, OLEDs are at the forefront of display technology and recently, applications of OLEDs have emerged in solid state lighting. Additionally, OLEDs can be made extremely flexible and stretchable, making them suitable for use in wearable electronics. Among light emitting materials for OLEDs, thermally activated delayed fluorescent (TADF) materials have shown great promise in the last few years. In this study, we report a solution processable TADF emitting polymer as an emissive material for OLEDs. The bespoke polymer structure has the TADF emitter 4-(9H-carbazol9-yl)-2-(3′-hydroxy-[1,1′- biphenyl]-3-yl)isoindoline-1,3-dione as a pendant group on a poly(methyl methacrylate) based polymer chain. We demonstrate ink-jet printed OLEDs using our TADF polymer, which allows for precise patterning without masks, deposition of nanometer scale thicknesses, and minimal wastage
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