Formation of Ohmic hole injection by inserting an ultrathin layer of molybdenum trioxide between indium tin oxide and organic hole-transporting layers

2007 ◽  
Vol 91 (25) ◽  
pp. 253504 ◽  
Author(s):  
Toshinori Matsushima ◽  
Yoshiki Kinoshita ◽  
Hideyuki Murata
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Molybdenum Trioxide ◽  
Hole Injection ◽  
Hole Transporting ◽  
Ultrathin Layer

The origin of the hole injection improvements at indium tin oxide/molybdenum trioxide/N,N′-bis(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl- 4,4′-diamine interfaces

2008 ◽  
Vol 93 (4) ◽  
pp. 043308 ◽  
Author(s):  
Hyunbok Lee ◽  
Sang Wan Cho ◽  
Kyul Han ◽  
Pyung Eun Jeon ◽  
Chung-Nam Whang ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Molybdenum Trioxide ◽  
Hole Injection

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.

Blue and White Organic Light-Emitting Devices Using 2,5-Diphenyl -1, 4-Distyrylbenzene with Two Trans-Double Bonds as a Blue Emitting Layer

2005 ◽  
Vol 475-479 ◽  
pp. 1805-1808
Author(s):  
Gang Cheng ◽  
Zengqi Xie ◽  
Ying Fang Zhang ◽  
Yuguang Ma ◽  
Shi Yong Liu
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Maximum Efficiency ◽  
Double Bonds ◽  
Yellow Light ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Hole Transporting ◽  
Organic Light Emitting Devices

A novel derivative of oligo(phenylenvinylene) (OPV), 2,5-diphenyl -1, 4-distyrylbenzene with two trans-double bonds (trans-DPDSB), is used as a blue emitting material in blue and white organic light-emitting devices (OLEDs). Blue devices with a configuration of indium-tin oxide (ITO)/N,N´-diphenyl-N,N´-bis(1-naphthyl)-(1,1´-biphenyl)-4,4´-diamine (NPB)/ trans-DPDSB / tris (8-hydroxyquinoline) aluminum (Alq3)/LiF/Al are constructed, where NPB, Alq3 and trans-DPDSB are used as hole-transporting, electron-transporting and light-emitting layers, respectively. The color of emission is changed from blue-green to pure blue when the trans-DPDSB layer is thicker. By inserting an ultrathin 5,6,11,12-tetraphenylnaphthacene (rubrene) yellow light-emitting layer between the Alq3 and trans-DPDSB layers, white OLEDs are obtained. The maximum efficiency and luminance of the blue and white devices are 1.2, 3.0 cd/A, and 1400, 7000 cd/m2, respectively.

scholarly journals Enhancement of hole injection using ozone treated Ag nanodots dispersed on indium tin oxide anode for organic light emitting diodes

2007 ◽  
Vol 90 (16) ◽  
pp. 163516 ◽  
Author(s):  
Jong-Min Moon ◽  
Jung-Hyeok Bae ◽  
Jin-A Jeong ◽  
Soon-Wook Jeong ◽  
No-Jin Park ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Hole Injection ◽  
Light Emitting ◽  
Organic Light ◽  
Oxide Anode

Enhancing the hole injection ability of indium tin oxide viaammonium salts in polymer light-emitting diodes

2013 ◽  
Vol 1 (3) ◽  
pp. 531-535 ◽  
Author(s):  
Kai-Wei Tsai ◽  
Sung-Nien Hsieh ◽  
Tzung-Fang Guo ◽  
Yao-Jane Hsu ◽  
Alex K.-Y. Jen ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Light Emitting Diodes ◽  
Hole Injection ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes

Modulation of indium–tin oxide work function by a versatile self-assembled monolayer measured with the scanning Kelvin nanoprobe

2011 ◽  
Vol 89 (12) ◽  
pp. 1512-1518 ◽  
Author(s):  
Christophe Blaszykowski ◽  
Larissa-Emilia Cheran ◽  
Michael Thompson
Keyword(s):  
Work Function ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Light Emitting Diode ◽  
Critical Role ◽  
Protective Layer ◽  
Organic Coating ◽  
Hole Injection ◽  
Self Assembled Monolayer ◽  
Self Assembling

In molecular optoelectronics, high-quality contacts at electrode|organics interfaces are crucial for charge carriers to efficiently flow through and therefore play a critical role on device performance. Electrode surface morphology, adhesibility, wettability, and work function are thus many parameters that must be accurately controlled, which is achievable using self-assembling monolayer (SAM) surface chemistry. Herein, we employ this technique to alter the electronic and surface energy-related properties of indium–tin oxide (ITO). In comparison to unmodified ITO, the newly introduced SAM-derivatized surface exhibits limited wettability and considerably higher work function (ΔΦ = ~1.2 eV). Several applications are proposed for this organic coating, notably at the anode of organic light-emitting diode (OLED) devices for decreasing the hole injection barrier or as an atmospherically stable protective layer in the coatings industry.

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