Energy-well band structure for enhanced exciton confinement effect in perovskite light-emitting diodes via spray-coating
Source abstract
Abstract
Perovskites possess bright emission and high color purity, but constructing strong charge confinement is requisite for application in efficient light-emitting diodes. Here, we demonstrate a breakthrough to enhance the exciton confinement effect by introducing a Cs 4PbBr 6 layer on a CsPbBr 3 perovskite film through the spray-coating deposition. The impact of the Cs 4PbBr 6 layer is thoroughly investigated and indicates that the Cs 4PbBr 6 layer results in a confined energy-wall band structure and a stronger exciton binding energy. Accordingly, the CsPbBr 3 film with Cs 4PbBr 6 wall exhibits higher photoluminescence (PL) and electroluminescence (EL) from the perovskite light-emitting diodes (PeLEDs). We further optimize the device architecture in an energy-well band structure by sandwiching the CsPbBr 3 between the Cs 4PbBr 6 buried layer and overlayer. As a result, the PeLED with Cs 4PbBr 6 well exhibits ∼18 nm of full width at half maximum (FWHM) in the emission spectrum, 25,738 cd m −2 of maximum luminance, 65.94 cd A −1 of maximum current efficiency (CE), 15.08% of maximum external quantum efficiency (EQE).
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Research context
OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Solid-state spectroscopy and crystallography
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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