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Red, green and blue phosphorescent organic light-emitting diodes with ITO-free anode material
摘要： The non-productive hole-current from blue, green and red phosphorescent OLEDs was reduced by employing silver nanoparticles embedded glass:Ni-Ag-codoped ZnO (SNSZO) anode and enhanced the efficiencies. The blue device using SNSZO: Ir(fdbdi)3 exhibit maximum luminance (L) of 42683 cd/m2, current efficiency (ηc) of 43.6 cd/A and power efficiency (ηp) of 45.3 lm W-1 with external quantum efficiency (ηex) of 20.2 % than ITO: Ir(fdbdi)3 based device [L- 35126 cd/m2; ηc - 38.4 cd/A; ηp - 37.3 lm w-1; ηex -15.1 %]. The green device with SNSZO: Ir(mnmpdi)2(acac) show intensified emission at 520 nm and exhibit higher efficiency; L - 47238 cd/m2, ηc -50.9 cd/A, ηp - 49.3 lm w-1 and ηex - 18.9 % [ITO: Ir(mnmpdi)2(acac): L- 39326 cd/m2; ηc-46.0 cd/A; ηp -39.3 lm w-1; ηex -13.8 %]. The red device (620 nm) with SNSZO: Ir(mnpbi)2(acac) show L - 9058 cd/m2, ηc - 8.3 cd/A, ηp -6.4 lm w-1 and ηex - 12.2 % [ITO: Ir(mnpbi)2(acac): L- 7632 cd/m2; ηc -4.1 cd/A; ηp -6.40 lm w-1; ηex -6.0 %]. The proposed OLEDs with SNSZO anode shows excellent efficiencies than ITO and providing alternate for high-performance OLEDs and other optoelectronic devices.
关键词： maximum efficiencies,Glass: Ni-Ag-codoped ZnO interface,surface Plasmon.,anode material
更新于2025-09-16 10:30:52
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Facile synthesis of heteroatom doped and undoped graphene quantum dots as active materials for reversible lithium and sodium ions storage
摘要： Zero-dimensional graphene quantum dots have attractive properties but the synthesis of graphene quantum dots in a simple and scalable technique is tedious, which limits its utilization in different energy storage application. In this study, we present a simple and scalable approach to produce graphene quantum dots and heteroatom doped graphene quantum dots using chemical vapor deposition technique. Graphene quantum dots are prepared using alloy-based catalyst and methane as a carbon source. Boron-doped and nitrogen-doped graphene quantum dots are prepared at low temperature using graphite oxide without the use of dialysis bag. Here, the electrochemical lithium and sodium ion storage properties of doped and undoped graphene quantum dots are studied without being used as a supporting material for the performance enhancement as reported in previous reports. Boron doped GQD (B-GQD) exhibits a high specific capacity of 1097 mAh g?1 at a specific current of 50 mA g?1 for lithium and sodium ion batteries respectively. B-GQD exhibits high volumetric energy density of 537 Ah L?1 and 214 Ah L?1 with an average voltage of 0.43 V and 0.57 respectively for lithium ion and sodium ion batteries. Also, the cells observe a satisfactory cyclic performance for 500 cycles with good capacity retention. Detailed investigations show that the edge defects present in GQD and doped GQDs help to enhance the electrochemical storage performance of lithium and sodium ions.
关键词： Doped,Lithium ion battery,Quantum dots,Sodium ion battery,Anode material
更新于2025-09-12 10:27:22
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Preparation of multifunctional porous carbon electrodes through direct laser writing on a phenolic resin film
摘要： In this study, CuO@ZnO core-shell composite materials were successfully reported by chemical processes of depositing ZnO on the CuO surface. When evaluated as a lithium-ion battery anode, the CuO@ZnO composite shows a higher specific capacity of 300 mAh g-1 at 0.2 C after 100 cycles, especially CuO@ZnO-6.5% (the molar ratio of CuO to ZnSO4·7H2O of 1:0.065) composite material electrode still holds 459.5 mAh g-1 discharge capacity after 500 cycles. The test results show that the excellent coating on the CuO@ZnO composites improves the stability performance as electrodes for lithium-ion batteries due to the mechanism of ZnO. Therefore, the certain coverage of the CuO@ZnO composite electrode results in a valuable material for anodes in future batteries.
关键词： Lithium-ion battery,Anode material,CuO@ZnO composites
更新于2025-09-11 14:15:04