Rearrangement of the molecular orientation of Alq3 in organic light-emitting diodes under constant current aging investigated using sum frequency generation spectroscopy

2014 ◽  
Vol 616-617 ◽  
pp. 86-90 ◽  
Author(s):  
Takayuki Miyamae ◽  
Noriyuki Takada ◽  
Toshihiro Yoshioka ◽  
Satoshi Miyaguchi ◽  
Hiroshi Ohata ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Light Emitting Diodes ◽  
Sum Frequency Generation ◽  
Organic Light Emitting Diodes ◽  
Constant Current ◽  
Light Emitting ◽  
Sum Frequency ◽  
Organic Light ◽  
Sum Frequency Generation Spectroscopy ◽  
Frequency Generation

scholarly journals Horizontal molecular orientation in solution-processed organic light-emitting diodes

2015 ◽  
Vol 106 (6) ◽  
pp. 063301 ◽  
Author(s):  
L. Zhao ◽  
T. Komino ◽  
M. Inoue ◽  
J.-H. Kim ◽  
J. C. Ribierre ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light

The study of polythiophene/water interfaces by sum-frequency generation spectroscopy and molecular dynamics simulations

2015 ◽  
Vol 3 (31) ◽  
pp. 6429-6438 ◽  
Author(s):  
S. Bellani ◽  
M. Porro ◽  
C. Caddeo ◽  
M. I. Saba ◽  
P. B. Miranda ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Molecular Orientation ◽  
Sum Frequency Generation ◽  
Sum Frequency ◽  
Sum Frequency Generation Spectroscopy ◽  
Frequency Generation ◽  
Dynamics Simulations

Polythiophene/water interfaces are investigated by sum frequency generation spectroscopy and molecular dynamics simulations, showing a preferential edge-on molecular orientation.

Molecular Orientation of Asphaltenes and PAH Model Compounds in Langmuir−Blodgett Films Using Sum Frequency Generation Spectroscopy

Langmuir ◽  
2011 ◽  
Vol 27 (10) ◽  
pp. 6049-6058 ◽  
Author(s):  
A. Ballard Andrews ◽  
Arthur McClelland ◽  
Oona Korkeila ◽  
Alexander Demidov ◽  
Amber Krummel ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Sum Frequency Generation ◽  
Model Compounds ◽  
Sum Frequency ◽  
Langmuir Blodgett ◽  
Sum Frequency Generation Spectroscopy ◽  
Langmuir Blodgett Films ◽  
Frequency Generation

Single-Carrier Devices for the Understanding of the Voltage Drift in Organic Light Emitting Diodes

2011 ◽  
Vol 1359 ◽  
Author(s):  
J. Boizot ◽  
V. Gohri ◽  
H. Doyeux
Keyword(s):  
Light Emitting Diodes ◽  
Low Voltage ◽  
Electron Injection ◽  
Organic Light Emitting Diodes ◽  
Hole Injection ◽  
Constant Current ◽  
Light Emitting ◽  
Single Carrier ◽  
Organic Light ◽  
Voltage Drift

ABSTRACTThe aim of this study is to analyze and mitigate the voltage drift phenomenon observed in top-emitting organic light emitting diodes (OLED) when driven at constant current. An operating device may experience voltage increase over time due to factors such as interface or bulk material degradation, charge accumulation and formation of trap states. Single-carrier devices were fabricated to understand the contribution to voltage drift from each of these causes. Doping in electron injection layer (4, 7-diphenyl-1,10-phenanthroline or Bphen) and hole injection layer (2,2’,7,7’-tetra(N,N-di-tolyl)amino-spiro-bifluorene or Spiro-TTB) were optimized to obtain ohmic injection contacts. Devices with tris(8-hydroxy-quinoline) aluminium (Alq3) degrade significantly with holes injection and undergo high voltage increase in lifetime test measurements. On the contrary, devices with N,N’-di(naphtalen-1-y1)-N,N’-diphenyl-benzidine (NPB) exhibit an ambipolar charge transport behavior and low voltage drift under both hole and electron injection.

Advantages and disadvantages of vacuum-deposited and spin-coated amorphous organic semiconductor films for organic light-emitting diodes

2015 ◽  
Vol 3 (42) ◽  
pp. 11178-11191 ◽  
Author(s):  
Maki Shibata ◽  
Yoshiya Sakai ◽  
Daisuke Yokoyama
Keyword(s):  
Organic Semiconductor ◽  
Molecular Orientation ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Transition Temperatures ◽  
Semiconductor Films ◽  
Light Emitting ◽  
Advantages And Disadvantages ◽  
Organic Light

Film densities, transition temperatures, and degrees of horizontal molecular orientation of vacuum-deposited and spin-coated amorphous organic semiconductor films used for OLEDs are systematically and quantitatively compared, and their general differences are discussed.

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