Nano Letters · 2022 · 155 citations · 35 references
Natural SciencesChemistryMaterials ScienceOptoelectronicsSemiconductor DevicesSemiconductor MaterialsLight-emitting DiodesLuminescent MaterialsOptoelectronic MaterialsQuantum ConfinementQuantum DotsSemiconductor NanomaterialsCharge InjectionElectroluminescenceExternal Quantum EfficiencyHole TransportPerovskite Light-emitting DiodesQuantum EfficiencySemiconductor Quantum DotsValence Band
It is still challenging to achieve high-efficiency pure-red (620–650 nm wavelength) perovskite light-emitting diodes (PeLEDs). Herein, we report pure-red PeLEDs with Commission Internationale de l’Eclairage coordinates (0.703, 0.297) meeting the Rec. 2020, an external quantum efficiency of 20.8%, and a luminance of 3775 cd/m2. This design is based on the strong quantum confinement CsPbI3 quantum dots (QDs) capped by composite ligands of 3-phenyl-1-propylamine and tetrabutylammonium iodide. This strategy stabilized the structure of the strong-confined QDs and reduced the influence of the electric field-induced Stark effect on the PeLEDs. Furthermore, the exciton binding energy of the QDs was decreased by the composited ligands to suppress Auger recombination within the devices. Additionally, the valence-band maximum of the QDs was lifted to match the hole-transport layer, thus balancing charge injection in the PeLEDs. Our device also demonstrated a stable electroluminescence spectrum and a lifetime of 5.6 times longer than the control device.
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Loredana Proteşescu, Sergii Yakunin, Maryna I. Bodnarchuk et al. · Nano Letters · 2015 · 9K citations · Full text
Natural Sciences, Materials Engineering, Materials Science +17
Metal-free efficient photocatalyst for stable visible water splitting via a two-electron pathway
Juan Liu, Yang Liu, Naiyun Liu et al. · Science · 2015 · 4.4K citations