Solution‐Processed Composite Interfacial Layer of MoOx‐Doped Graphene Oxide for Robust Hole Injection in Organic Light‐Emitting Diode

Solution‐processed composite hole injection interfacial layer (HIL) of MoOx‐doped graphene oxide (GO + MoOx) is facilely fabricated. Using GO + MoOx HIL, we demonstrate highly efficient tris(8‐hydroxy‐quinolinato)aluminum‐based organic light‐emitting diodes with maximum luminous efficiency of 8.6 cd A−1, power efficiency of 5.7 lm W−1, and external quantum efficiency of 3.5%, which have been enhanced by 41.0% (75.5%), 39.0% (96.6%), and 40.0% (75.0%), respectively, in comparison with the counterpart using simple HIL of MoOx (GO). Atomic force microscopy and X‐ray/ultraviolet photoelectron spectroscopy measurements show GO + MoOx behaving superior film morphology and extra electronic properties such as enhanced surface work function. Current–voltage characteristics and impedance spectroscopy of hole only cells elucidate that GO + MoOx substantially promotes hole injection and thus accounts for excellent device performance. Our results pave a way for advancing organic electronic devices with solution process as well as boosting GO application.

[1]  J. Xiong,et al.  Facile solution-processed aqueous MoO x for feasible application in organic light-emitting diode , 2018 .

[2]  Lihui Wang,et al.  The feasibility of using solution-processed aqueous La 2 O 3 as effective hole injection layer in organic light-emitting diode , 2018 .

[3]  S. Lee,et al.  Work function engineering of graphene oxide via covalent functionalization for organic field-effect transistors , 2017 .

[4]  Kyoung Soon Choi,et al.  MoS2-nanosheet/graphene-oxide composite hole injection layer in organic light-emitting diodes , 2017, Electronic Materials Letters.

[5]  Lihui Wang,et al.  Solution-processed aqueous composite hole injection layer of PEDOT:PSS+MoOx for efficient ultraviolet organic light-emitting diode , 2017 .

[6]  C. Varlikli,et al.  Controlling the distribution of oxygen functionalities on GO and utilization of PEDOT:PSS-GO composite as hole injection layer of a solution processed blue OLED , 2017 .

[7]  S. Kang,et al.  A solution-processable inorganic hole injection layer that improves the performance of quantum-dot light-emitting diodes , 2017 .

[8]  K. Jeganathan,et al.  Hole injection enhancement in organic light emitting devices using plasma treated graphene oxide , 2017 .

[9]  X. W. Sun,et al.  Solution-processed vanadium oxide as an efficient hole injection layer for quantum-dot light-emitting diodes , 2017 .

[10]  J. Xiong,et al.  Exceeding 4% external quantum efficiency in ultraviolet organic light-emitting diode using PEDOT:PSS/MoOx double-stacked hole injection layer , 2017 .

[11]  J. Xiong,et al.  Solution-processed MoOx hole injection layer towards efficient organic light-emitting diode , 2016 .

[12]  G. He,et al.  Highly conductive PEDOT:PSS and graphene oxide hybrid film from a dipping treatment with hydroiodic acid for organic light emitting diodes , 2016 .

[13]  Hui‐Ming Cheng,et al.  Graphene oxide/graphene vertical heterostructure electrodes for highly efficient and flexible organic light emitting diodes. , 2016, Nanoscale.

[14]  Qidai Chen,et al.  Improved efficiency of indium-tin-oxide-free organic light-emitting devices using PEDOT:PSS/graphene oxide composite anode , 2015 .

[15]  W. Choy,et al.  Post‐treatment‐Free Solution‐Processed Non‐stoichiometric NiOx Nanoparticles for Efficient Hole‐Transport Layers of Organic Optoelectronic Devices , 2015, Advanced materials.

[16]  S. Y. Kim,et al.  Use of silane-functionalized graphene oxide in organic photovoltaic cells and organic light-emitting diodes. , 2015, Physical chemistry chemical physics : PCCP.

[17]  Congya Wu,et al.  Effect of Graphene Oxide Doped PEDOT:PSS as a Hole Injection Layer on the Luminescence Performance of Organic Light-Emitting Diodes , 2015 .

[18]  Changhee Lee,et al.  Composite film of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) and MoO3 as an efficient hole injection layer for polymer light-emitting diodes , 2014 .

[19]  Dongqing Wu,et al.  Highly conductive and uniform graphene oxide modified PEDOT:PSS electrodes for ITO-Free organic light emitting diodes , 2014 .

[20]  X. W. Sun,et al.  Solution processed tungsten oxide interfacial layer for efficient hole-injection in quantum dot light-emitting diodes. , 2014, Small.

[21]  Jin Jang,et al.  GO:PEDOT:PSS for High-Performance Green Phosphorescent Organic Light-Emitting Diode , 2013, IEEE Electron Device Letters.

[22]  Shui-Tong Lee,et al.  Anode modification of polymer light-emitting diode using graphene oxide interfacial layer: The role of ultraviolet-ozone treatment , 2013 .

[23]  Jianhui Hou,et al.  Low‐Temperature Solution‐Processed Hydrogen Molybdenum and Vanadium Bronzes for an Efficient Hole‐Transport Layer in Organic Electronics , 2013, Advanced materials.

[24]  J. Bernède,et al.  Improved performance of organic solar cells by growth optimization of MoO3/CuI double‐anode buffer , 2013 .

[25]  R. Moubah,et al.  Solution-processable graphene oxide as an efficient hole injection layer for high luminance organic light-emitting diodes , 2013, 1401.4427.

[26]  D. Kumaki,et al.  Reduced contact resistance and highly stable operation in polymer thin-film transistor with aqueous MoOx solution contact treatment , 2013 .

[27]  L. Liao,et al.  Aqueous solution-processed MoO3 as an effective interfacial layer in polymer/fullerene based organic solar cells , 2013 .

[28]  A. Kahn,et al.  Transition Metal Oxides for Organic Electronics: Energetics, Device Physics and Applications , 2012, Advanced materials.

[29]  Joong Tark Han,et al.  Highly efficient polymer light-emitting diodes using graphene oxide-modified flexible single-walled carbon nanotube electrodes , 2012 .

[30]  A. Heeger,et al.  A Solution‐Processed MoOx Anode Interlayer for Use within Organic Photovoltaic Devices , 2012 .

[31]  Yongkee Hwang,et al.  68.1: Capacitance‐Voltage Characteristics of Top Emitting Organic Light Emitting Diodes for Mobile Display Application , 2011 .

[32]  Jens Meyer,et al.  MoO3 Films Spin‐Coated from a Nanoparticle Suspension for Efficient Hole‐Injection in Organic Electronics , 2011, Advanced materials.

[33]  Tung‐Hui Ke,et al.  Impedance spectroscopy and equivalent circuits of conductively doped organic hole-transport materials , 2010 .