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More Than 9% Efficient ZnSeTe Quantum Dot-Based Blue Electroluminescent Devices
摘要： We explore both synthesis of Cd-free blue quantum dots (QDs) with high-quality photoluminescence (PL) characteristics and fabrication of high-efficiency QD-light-emitting diodes (QLEDs). True blue (445 nm)-emissive, multishelled ZnSeTe QDs with a high PL quantum yield of 84% and sharp bandwidth of 27 nm are prepared. To obtain a better electron transport layer (ETL) material, surface of ZnMgO nanoparticles (NPs) is modified by additional Mg reaction, leading to the possible formation of Mg(OH)2 layer on the surface-modified ZnMgO (m-ZnMgO) NPs. The presence of Mg(OH)2 overlayer, origin for the desirably reduced electron mobility, is supposedly responsible for the improved charge balance of QD emissive layer (EML). The Mg(OH)2 layer is further found to alleviate the emission quenching of QD EML. Combining blue ZnSeTe QDs and m-ZnMgO NP ETL, highly bright, efficient blue QLEDs with the record luminance of 2904 cd/m2 and external quantum efficiency of 9.5% are demonstrated.
关键词： electron transport layer,Mg(OH)2 overlayer,electroluminescent devices,photoluminescence,ZnSeTe QDs,Cd-free blue quantum dots,QLEDs,ZnMgO nanoparticles
更新于2025-09-19 17:13:59
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Chemical and Electrochemical Syntheses, Structure, and Luminescent Properties of Zinc and Cadmium Complexes with N-{2-[(E)-(4-tert-Butylphenyl)iminomethyl]phenyl}-4-methylbenzenesulfonamide
摘要： New Zn(II) and Cd(II) complexes with N-{2-[(E)-(4-tert-butylphenyl)iminomethyl]phenyl}-4-methylbenzenesulfonamide were synthesized by chemical and electrochemical methods. The ligand and metal complexes were characterized by the methods of IR, 1H NMR, electron absorption spectroscopy, and X-ray absorption spectroscopy and by quantum chemical calculations. Electroluminescent devices with zinc and cadmium complexes were fabricated as emitter layers, which showed radiation brightness of 460 cd/m2 (15 V) with a maximum at 502 nm and 140 cd/m2 (15 V) with a maximum at 535 nm, respectively.
关键词： metal chelates,azomethines,electroluminescent devices
更新于2025-09-09 09:28:46
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Self-healable electroluminescent devices
摘要： Electroluminescent (EL) devices have been extensively integrated into multi-functionalized electronic systems in the role of the vitally constituent light-emitting part. However, the lifetime and reliability of EL devices are often severely restricted by concomitant damage, especially when the strain exceeds the mechanical withstanding limit. We report a self-healable EL device by adopting a modified self-healable polyacrylic acid hydrogel as the electrode and a self-healable polyurethane as a phosphor host to realize the first omni-layer-healable light-emitting device. The physicochemical properties of each functionalized layer can be efficiently restored after experiencing substantial catastrophic damage. As a result, the luminescent performance of the self-healable EL devices is well recovered with a high healing efficiency (83.2% for 10 healing cycles at unfixed spots, and 57.7% for 20 healing cycles at a fixed spot). In addition, inter-device healing has also been developed to realize a conceptual “LEGO”-like assembly process at the device level for light-emitting devices. The design and realization of the self-healable EL devices may revive their performance and expand their lifetime even after undergoing a deadly cut. Our self-healable EL devices may serve as model systems for electroluminescent applications of the recently developed ionically conductive healable hydrogels and dielectric polymers.
关键词： Self-healable,LEGO assembly,Electroluminescent devices,Polyurethane,Polyacrylic acid hydrogel
更新于2025-09-04 15:30:14