Electrical and Optical Properties of Green Polymer Light Emitting Diodes with Various Structures of Au Nanoparticles

2015 ◽  
Vol 15 (10) ◽  
pp. 7693-7698
Author(s):  
Byung Min Park ◽  
Gi Ppeum Kim ◽  
Sae Chan Mun ◽  
Ho Jung Chang
Keyword(s):  
Optical Properties ◽  
Au Nanoparticles ◽  
Light Emitting Diodes ◽  
Synthesis Method ◽  
Hole Injection ◽  
Electrical And Optical Properties ◽  
Au Nps ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes ◽  
Green Polymer

The green polymer light emitting diodes (PLEDs) were fabricated using the solution precursor synthesis method. To improve the device’s electrical and optical properties, gold (Au) nanoparticles (NPs) were added to the hole injection layer (HIL) with poly(3,4-ethylene-dioxythiophene): poly(styrenesulfolnate) (PEDOT:PSS) organic material. The green PLED devices with a structure of glass/ITO/PEDOT:PSS+Au NPs/PVK:Ir(ppy)3/TPBi/LiF/Al were prepared by conventional spin-coating and thermal evaporation methods. Various concentrations of Au NPs were doped to the HILs to optimize the device’s light emitting characteristic. The effects of Au NPs concentrations on the properties of PLEDs were investigated. The doping concentrations of Au NPs were changed ranging from 0.0 to 1.0 vol%. At the optimized Au NPs concentration of 0.5 vol%, we also studied the effects of various film layers with and without Au NPs on the properties of PLEDs. The maximum luminance and external quantum efficiency of the devices were found to be 20430 cd/m2 and 7.49%, respectively.

Organic Light Emitting Diodes: Effect of Annealing the Hole Injection Layer on the Electrical and Optical Properties

2011 ◽  
Vol 171 ◽  
pp. 39-50 ◽  
Author(s):  
P. Predeep ◽  
T.A. Shahul Hameed ◽  
J. Aneesh ◽  
M.R. Baiju
Keyword(s):  
Optical Properties ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Transport Layer ◽  
Hole Injection ◽  
Electrical And Optical Properties ◽  
Light Emitting ◽  
Emissive Layer ◽  
Hole Injection Layer ◽  
Organic Light

Organic Light Emitting Diodes (OLED) are receiving increased attention due to tremendous application potential these devices hold in the areas of large area displays and lighting applications. However, the problems of efficiency, stability and shelf life are major challenges for making OLEDs an attractive alternative. The simple device structure involving anode, emissive layer and cathode is no longer the norm. Recently, various buffer layers like Hole Injection Layer (HIL), Hole transport Layer (HTL), Electron Injection Layer (EIL), Electron Transport Layer (ETL) etc. are being widely used as integral parts of the OLED architecture to enhance the performance parameters. The nomenclature of these layers is often confusing and sometimes used by different authors to mean different layers and a common and universal nomenclature for layers is still wanting. Applying a buffer layer, often called as the hole injecting layer (HIL) between anode and emissive layer is a general technique for increasing the efficiency and stability of organic light emitting diodes. Poly- (3,4-ethyhylene dioxythiophene): poly- (styrenesulphonate) (PEDOT:PSS) is a very common and popular such HIL used in OLEDs. In this chapter, a basic structure of OLEDs has been discussed in perspective with this HIL material and the effect of annealing this PEDOT: PSS layer on the characteristics of the device at different temperatures ranging from 100°C to 300°C in vacuum. Devices fabricated in clean room conditions are characterized for their electrical and optical properties. Equivalent circuits of the devices are deduced using impedance spectroscopy and discussed. Surface morphology of the HIL layers using atomic force microscopy (AFM) provides reasons for the variation of the device properties with the annealing of HIL.

Hole-injection enhancement of top-emissive polymer light-emitting diodes by P3HT/FNAB modification of Ag anode

2009 ◽  
Vol 10 (6) ◽  
pp. 1141-1145 ◽  
Author(s):  
Lai-Wan Chong ◽  
Ying-Nien Chou ◽  
Yuh-Lang Lee ◽  
Ten-Chin Wen ◽  
Tzung-Fang Guo
Keyword(s):  
Light Emitting Diodes ◽  
Hole Injection ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes

pH-neutral PEDOT:PSS as hole injection layer in polymer light emitting diodes

2011 ◽  
Vol 12 (3) ◽  
pp. 504-508 ◽  
Author(s):  
Sha Wu ◽  
Shaohu Han ◽  
Yina Zheng ◽  
Hua Zheng ◽  
Nanliu Liu ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Hole Injection ◽  
Light Emitting ◽  
Hole Injection Layer ◽  
Polymer Light Emitting Diodes

Electron-Enhanced Hole Injection in Blue Polyfluorene-Based Polymer Light-Emitting Diodes

2004 ◽  
Vol 14 (7) ◽  
pp. 677-683 ◽  
Author(s):  
T. van Woudenbergh ◽  
J. Wildeman ◽  
P. W. M. Blom ◽  
J. J. A. M. Bastiaansen ◽  
B. M. W. Langeveld-Vos
Keyword(s):  
Light Emitting Diodes ◽  
Hole Injection ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes
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