Improvement of Turn-On Voltage and Charge Injection in Organic Light-Emitting Diodes Comprising Ga Doped In–Zn–O Anode by Thermal Annealing

2017 ◽  
Vol 17 (5) ◽  
pp. 3097-3100
Author(s):  
Ji-Yun Chun ◽  
Tae Wan Kim
Keyword(s):  
Thermal Annealing ◽  
Light Emitting Diodes ◽  
Charge Injection ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Turn On ◽  
Organic Light

UV-induced modulation of the conductivity of polyaniline: towards a photo-patternable charge injection layer for structured organic light emitting diodes

2012 ◽  
Vol 22 (7) ◽  
pp. 2922-2928 ◽  
Author(s):  
Thomas Griesser ◽  
Simone Viola Radl ◽  
Thomas Koepplmayr ◽  
Archim Wolfberger ◽  
Matthias Edler ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Charge Injection ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

Effect of Li2O/Al Cathode in Alq3 Based Organic Light-Emitting Diodes

2008 ◽  
Vol 8 (9) ◽  
pp. 4684-4687 ◽  
Author(s):  
Eun Chul Shin ◽  
Hui Chul Ahn ◽  
Wone Keun Han ◽  
Tae Wan Kim ◽  
Won Jae Lee ◽  
...  
Keyword(s):  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Turn On ◽  
Organic Light ◽  
Maximum Current ◽  
The One ◽  
Luminance Efficiency ◽  
A Current

An effect of bilayer cathode Li2O/Al was studied in Alq3 based organic light-emitting diodes with a variation of Li2O layer thickness. The current-luminance-voltage characteristics of ITO/TPD/Alq3/Li2O/Al device were measured at ambient condition to investigate the effect of Li2O/Al. It was found that when the thickness of Li2O layer is in the range of 0.5∼1 nm, there are improvements in luminance, efficiency, and turn-on voltage of the device. A current density and a luminance are increased by about 100 times, a turn-on voltage is lowered from 6 V to 3 V, a maximum current efficiency is improved by a factor of 2.3, and a maximum power efficiency is improved by a factor of 3.2 for a device with a use of thin Li2O layer compared to those of the one without the Li2O layer. These improvements are thought to be due to a lowering of electron-barrier height for electron injection from the cathode to the emissive layer.

scholarly journals Charge injection and transport in single-layer organic light-emitting diodes

1998 ◽  
Vol 73 (21) ◽  
pp. 3162-3164 ◽  
Author(s):  
B. K. Crone ◽  
I. H. Campbell ◽  
P. S. Davids ◽  
D. L. Smith
Keyword(s):  
Light Emitting Diodes ◽  
Charge Injection ◽  
Single Layer ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

Low-driving-voltage sky-blue phosphorescent organic light-emitting diodes with bicarbazole-bipyridine bipolar host materials

2021 ◽  
Author(s):  
Deli Li ◽  
Di Liu ◽  
Jiuyan Li ◽  
Ruizhi Dong ◽  
Botao Liu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Driving Voltage ◽  
Light Emitting ◽  
Turn On ◽  
Organic Light ◽  
Host Materials ◽  
Blue Phosphorescent

Two bipolar host containing bipyridine and bicarbazole exhibited rapid and balanced charge transportation, which resulting the extremely low turn-on voltages of 2.3 and 2.4 V, respectively, and the high efficiency of 23.7% and 52.6 lm W−1.

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