Highly-Efficient Solution-Processed Organic Light Emitting Diodes with Blend V 2 O 5 -PEDOT:PSS Hole-Injection/Hole-Tran
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.261
Highly-Efficient Solution-Processed Organic Light Emitting Diodes with Blend V2O5-PEDOT:PSS Hole-Injection/Hole-Transport Layer Rohit Ashok Kumar Yadav, Mangey Ram Nagar, Deepak Kumar Dubey, Sujith Sudheendran Swayamprabha, and Jwo-Huei Jou Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
ABSTRACT
Organic light-emitting diodes (OLEDs) have attracted huge concern because of their intrinsic characteristics and ability to reach the pinnacle in the field of high-quality flat-panel displays and energy-efficient solid-state lighting. High-efficiency is always a key crux for OLED devices being energy-saving and longer life-span. OLEDs have encountered enormous difficulties in meeting the requirements for large-sized devices due to a major limitation in vacuum thermal evaporation technology. In multilayered OLED devices, the characteristics of the charge injection/transport layer is a crucial factor for the operating-voltage, powerefficiency and stability of the device. Transition metal oxides have shown great potential owing to their wide range of possible energy level alignments, balanced charge injection, and improvement of carrier mobilities. In this study, we report a solution-processed blend V2O5PEDOT:PSS hole-injection/hole-transport layer (HIL/HTL) for efficient orange phosphorescent OLEDs. The electroluminescent characteristics of blend V2O5-PEDOT:PSS based devices were studied with the structure ITO/V2O5-PEDOT:PSS/CBP:Ir(2phq)3/TPBi/LiF/Al. The V2O5-PEDOT:PSS based OLEDs displayed relatively higher device performance and low roll-off than that of the counter PEDOT:PSS device in terms of a maximum luminance of 17,670 cd m-2, power efficiency of 19.4 lm W-1, external quantum efficiency of 8.7%, and more importantly, low turn-on voltage. These results demonstrate an alternative approach based on metal oxide/organic blend HIL/HTL as a substitute of PEDOT:PSS for high-efficiency solution process OLEDs.
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INTRODUCTION In recent years, organic light emitting diodes (OLEDs) has surged into a mature technology and have attracted significant attention due to their superior performance in high-quality flat panel display and solid state lighting applications. Development of energy-efficient and long-lifespan OLEDs have attracted enormous attention in the last few years and become a front-line research field of academia as well as in industries. Numerous tactics have been employed in material chemistry and device engineering physics to enhance the OLEDs performance [1-4]. Solution-processing provides a low cost and low material utilization approach to fabricate OLED devices. The charge carrier transporting materials with the possibility of confinement of injected
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