Abstract
Fabrication of high-performance, flexible quantum-dot light-emitting diodes (QLEDs) requires the reliable manufacture of a flexible transparent electrode to replace the conventional brittle indium tin oxide (ITO) transparent electrode, along with flexible substrate planarization. We deposited a transparent oxide/metal/oxide (OMO) electrode on a polymer planarization layer and co-optimized both layers. The visible transmittance of the OMO electrode on a polyethylene terephthalate substrate increased markedly. Good electron supply and injection into an electron-transporting layer were achieved using WOX/Ag/ WOX and MoOx/Ag/MoOX OMO electrodes. High-performance flexible QLEDs were fabricated from these electrodes; a QLED with a MoOX/Ag/ MoOX cathode and an SU-8 planarization layer had a current efficiency of 30.3 cd/A and luminance more than 7 × 104 cd/m2. The current efficiency was significantly higher than that of a rigid QLED with an ITO cathode and was higher than current efficiency values obtained from previously reported QLEDs that utilized the same quantum-dot and electron-transporting layer materials as our study.
Highlights
Flexible electronic displays are in great demand
Flexible displays widen the applications of electronic displays and greatly reduce manufacturing costs, as they allow for roll-to-roll fabrication [5]
Despite the success of flexible organic light-emitting diodes (OLEDs), there is a growing demand for flexible devices based on quantumdot light-emitting diodes (QLEDs)
Summary
Most existing flexible displays employ organic light-emitting diodes (OLEDs). Despite the success of flexible OLEDs, there is a growing demand for flexible devices based on quantumdot light-emitting diodes (QLEDs). The brittleness of ITO films renders ITO unsuitable for fabrication of flexible transparent electrodes. Dielectric/metal/dielectric (DMD) multilayer flexible transparent electrodes were proposed for Micromachines 2022, 13, 269. Micromachines 2022, 13, 269 tleness of ITO films renders ITO unsuitable for fabrication of flexible transparent electrodes. Effects of DMD electrode fabrication and planarization device studied separately. Our study, substrate (using a polymer and flexi- in (fabricated from a In dielectric metal oxide planarization and conducting metal layers) layer) were optimized ble transparent electrodes
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