Enhanced performance of ultraviolet organic light-emitting diode by using graphene oxide and MoO₃ dual hole injection layer

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• 作者：Liming Liu ; Fengjiao You ; Qinghong Zheng ; Bingjie Mo ; Baoqing Zeng ; Honghang Wang ; Xiaowen Zhang and Bin Wei
• 刊名：physica status solidi (c)
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：14
• 期：1-2
• 全文大小：2502K
• ISSN：1610-1642a

文摘

A dual hole injection layer (d-HIL) composed of graphene oxide (GO) and transition metal oxide MoO₃ is constructed and proven to be effectively promotes the radiance and external quantum efficiency (EQE) of ultraviolet organic light-emitting diode (UV OLED). The device with d-HIL behaves a maximum radiance of 4.7 mW/cm² at 237.5 mA/cm² and EQE of 1.36% at 3.75 mA/cm², which have been enhanced by 27% and 19%, respectively, in comparison with the coun- terpart using conventional MoO₃single HIL. The ultraviolet photoelectron spectroscopy elucidates that GO/MoO₃ modification to the greatest extent enhances work function. The current-voltage characteristics and impedance spectroscopy of Hole-only devices clarify that GO/MoO₃ d-HIL considerably promotes hole injection capacity. Our results indicate that the d-HIL of GO/MoO₃ paves a way for constructing efficient UV OLED.