P-94: Improvement in Hole Injection into Quantum-dot Light-emitting Layer Using Organic Hole-transporting Material/Molybdenum Oxide Composite

2016 ◽  
Vol 47 (1) ◽  
pp. 1476-1479 ◽  
Author(s):  
Tomoya Hirose ◽  
Takao Hamada ◽  
Toshiaki Tsunoi ◽  
Eriko Aoyama ◽  
Ayumi Ishigaki ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Molybdenum Oxide ◽  
Hole Injection ◽  
Light Emitting ◽  
Oxide Composite ◽  
Hole Transporting ◽  
Hole Transporting Material

Quantum-dot light-emitting diodes with a perfluorinated ionomer-doped copper-nickel oxide hole transporting layer

Nanoscale ◽  
2018 ◽  
Vol 10 (15) ◽  
pp. 7281-7290 ◽  
Author(s):  
Hyo-Min Kim ◽  
Jeonggi Kim ◽  
Jin Jang
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Nickel Oxide ◽  
Light Emitting Diodes ◽  
Hole Injection ◽  
Solution Processed ◽  
Light Emitting ◽  
Copper Nickel ◽  
Hole Transporting

Herein, we report all solution-processed green quantum-dot light-emitting diodes (G-QLEDs) by introducing a perfluorinated ionomer (PFI, Nafion 117) into quantum dots (QDs) to improve hole injection.

Light-Emitting and Hole-Transporting Polymers for LEDs

1997 ◽  
Vol 488 ◽  
Author(s):  
Toshihiro Ohnishi ◽  
Shuji Doi ◽  
Masato Ueda ◽  
Fumi Yamaguchi ◽  
Takanobu Noguchi
Keyword(s):  
High Efficiency ◽  
Hole Mobility ◽  
Hole Injection ◽  
Side Chain ◽  
High Luminance ◽  
Strong Fluorescence ◽  
Light Emitting ◽  
Hole Transporting ◽  
Hole Transporting Material ◽  
Injection Barrier

AbstractVarious copolymers of arylene vinylenes, having strong fluorescence, showed predominantly the emission in the multi-layer device using an electron-transporting material(ETM) such as tris(8-quinolinolato)aluminum(Alq3). The emission from Alq3 was suppressed due to the high hole-injection barrier from the copolymers to ETM in spite of low or no barriers of electron injection from ETM to the copolymers. We have successfully prepared highly hole-transporting polysilane having a triphenylamine group as a side chain(TPA-PS). The hole mobility as high as 10 cm3cm2/Vs is attributable to the intermolecular hopping process facilitated by the interaction between the polysilane backbone and the triphenylamine group. The polysilane is effectively used as a hole transporting material. The bilayer LED device consisting of TPA-PS and Akb3 showed high luminance (2000cd/m2) and high efficiency (4cd/A).

Controlled Injection of Holes into ALQ3 Based Oleds by Means of An Oxidized Transport Layer

2001 ◽  
Vol 708 ◽  
Author(s):  
Mathew K. Mathai ◽  
Keith A. Higginson ◽  
Bing R. Hsieh ◽  
Fotios Papadimitrakopoulos
Keyword(s):  
Indium Tin Oxide ◽  
Oxidative Degradation ◽  
Transport Layer ◽  
Hole Injection ◽  
Carrier Injection ◽  
Salt Loading ◽  
Light Emitting ◽  
Hole Transporting ◽  
Intrinsic Degradation ◽  
Variable Conductivity

ABSTRACTIn this paper we report a method for tuning the extent of hole injection into the active light emitting tris- (8-hydroxyquinoline) aluminum (Alq3) layer in organic light emitting diodes (OLEDs). This is made possible by modifying the indium tin oxide (ITO) anode with an oxidized transport layer (OTL) comprising a hole transporting polycarbonate of N,N'-bis(3-hydroxymethyl)-N,N'-bis(phenyl) benzidine and diethylene glycol (PC-TPB-DEG) doped with varying concentrations of antimonium hexafluoride salt of N,N,N',N'-tetra-p-tolyl-4,4'-biphenyldiamine (TMTPD+ SbF6-). The conductivity of the OTL can be changed over three orders of magnitude depending on salt loading. The analysis of hole and electron current variations in these devices indicates that optimizing the conductivity of the OTL enables the modulation of hole injection into the Alq3 layer. The bipolar charge transport properties for OLEDs in which the interfacial carrier injection barriers have been minimized, are governed by the conductivities of the respective layers and in this case it is shown that the variable conductivity of the OTL does allow for better control of the same. Accordingly, varying the concentration of holes in the device indicates that beyond an optimum concentration of holes, further hole injection results in the formation of light quenching cationic species and the initiation of oxidative degradation processes in the Alq3 layer, thus accelerating the intrinsic degradation of these devices. The variable conductivity of the OTL can hence be used to minimize the occurrence of these processes.

An Efficient Hole Transporting Polymer for Quantum Dot Light‐Emitting Diodes

2021 ◽  
pp. 2100731
Author(s):  
Wenhai Wu ◽  
Zhao Chen ◽  
Yunfeng Zhan ◽  
Bochen Liu ◽  
Weidong Song ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Hole Transporting

Influence of hole transporting material on device performance in organic light-emitting diode

2000 ◽  
Vol 363 (1-2) ◽  
pp. 290-293 ◽  
Author(s):  
Shizuo Tokito ◽  
Koji Noda ◽  
Kou Shimada ◽  
Shin-ichiro Inoue ◽  
Makoto Kimura ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Device Performance ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Hole Transporting ◽  
Hole Transporting Material

A High Tg Carbazole-Based Hole-Transporting Material for Organic Light-Emitting Devices

2005 ◽  
Vol 17 (5) ◽  
pp. 1208-1212 ◽  
Author(s):  
Jiuyan Li ◽  
Di Liu ◽  
Yanqing Li ◽  
Chun-Sing Lee ◽  
Hoi-Lun Kwong ◽  
...  
Keyword(s):  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Hole Transporting ◽  
Organic Light Emitting Devices ◽  
Hole Transporting Material
Sign in / Sign up

Export Citation Format

Share Document