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Synergetic interface and morphology modification to achieve highly efficient solution-processed sky-blue organic light-emitting diodes
摘要： Solution-processed organic light-emitting diodes (OLEDs), especially blue OLEDs, generally suffer from the low efficiency. Herein, we report an efficient approach to achieve high efficiency by synergetic interface and morphology modification with a polymer, Poly(9-vinylcarbazole) (PVK). Sky-blue thermally activated delayed fluorescent (TADF) material, 10-(4-(4,6-diphenyl-1,3,5- triazin-2-yl)phenyl)-10H- spiro[acridine-9,9-fluorene] (SpiroAC-TRZ), is used as the emitter. The incorporation of PVK thin layer at the hole injection layer/emission layer (EML) interface and a small amount of PVK inner the EML modify the carrier behaviors at the interface and improve the EML morphology. As a result, balanced carrier distribution and reduced carrier recombination are realized at the interface and inner the EML. Through these strategies, the maximum external quantum efficiency and current efficiency of the optimal OLED achieve 25.1% and 53.5 cd/A. To the best of our knowledge, the efficiencies are the highest values ever achieved by the solution-processed sky-blue TADF OLEDs.
关键词： Blue organic light-emitting diodes,Thermally activated delayed fluorescence,High efficiency,All-solution process,Film morphology
更新于2025-09-23 15:21:01
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Efficient inkjet-printed blue OLED with boosted charge transport using host doping for application in pixelated display
摘要： Inkjet-printing is a desirable technology for organic light emitting diodes (OLEDs) owing to its compatibility with large-area low-cost full-color pixelated displays. In this work, we proposed a strategy to fabricate highly efficient inkjet-printed blue OLEDs by introducing 3,5-bis(N-car-bazolyl)benzene (mCP) as the host material into organic light emitting layers. By carefully tailoring the weight ratio of mCP to poly[(9,9-dioctyl-2,7-fluorene)-co-(dibenzothiophene-S,S-dioxide)] (PFSO), the device demonstrated superior charge transport capability, leading to balanced charge transport and optimized efficiency. Furthermore, in combination with modifying the mCP: PFSO ink formulation, a low-roughness organic emissive film on Poly(ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) layer was achieved. The performance of the inkjet-printed device has been significantly improved with nearly five times, which exhibits a maximum luminance and an external quantum efficiency of 3743 cd/m2 and 5.03%, respectively. The icing on the cake is that we fabricated a 3-inch blue OLED array device successfully with a brightness uniformity of 92.7%, which shows promising potential in realizing simple structure large-area and high-efficient OLEDs by inkjet printing.
关键词： Blue,Organic light emitting diodes,Charge transport,Inkjet-printing
更新于2025-09-23 15:19:57