scholarly journals Correlation of energy band alignment and turn-on voltage in organic light emitting diodes

2010 ◽  
Vol 96 (1) ◽  
pp. 013301 ◽  
Author(s):  
I-Wen Wu ◽  
Yu-Hung Chen ◽  
Po-Sheng Wang ◽  
Chao-Gong Wang ◽  
Shu-Han Hsu ◽  
...  
Keyword(s):  
Energy Band ◽  
Light Emitting Diodes ◽  
Band Alignment ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Turn On ◽  
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.

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.

scholarly journals Low turn-on voltage of doped organic light emitting diodes based on food dyes

2020 ◽  
Vol 5 ◽  
pp. 100099 ◽  
Author(s):  
Soha Dehsorkhi ◽  
Mari Rbi ◽  
Marjan Monshi ◽  
Mozhgan Hosseinnezhad
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Turn On ◽  
Organic Light ◽  
Food Dyes

Highly efficient and low voltage silver nanowire-based OLEDs employing a n-type hole injection layer

Nanoscale ◽  
2014 ◽  
Vol 6 (15) ◽  
pp. 8565-8570 ◽  
Author(s):  
Hyungjin Lee ◽  
Donghwa Lee ◽  
Yumi Ahn ◽  
Eun-Woo Lee ◽  
Lee Soon Park ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Low Voltage ◽  
Silver Nanowire ◽  
Organic Light Emitting Diodes ◽  
Hole Injection ◽  
High Current ◽  
Light Emitting ◽  
Turn On ◽  
Organic Light ◽  
Transparent Conducting

The organic light-emitting diodes with an AgNW transparent conducting electrode exhibit remarkable mechanical flexibility and excellent device characteristics such as very low turn-on voltage and extremely high current and power efficiencies.

Multifunctional pyridine styrylphenanthroimidazoles: Electron transport materials for blue FOLEDs with low efficiency roll-off and host for PHOLEDs with low turn-on voltage

2021 ◽  
Author(s):  
Jayaraman Jayabharathi ◽  
Sekar Sivaraj ◽  
Venugopal Thanikachalam ◽  
Jagathratchagan Anudeebhana
Keyword(s):  
Electron Transport ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Turn On ◽  
Organic Light ◽  
Host Materials ◽  
Low Efficiency

We have reported pyridine styrylphenanthroimidazole derivatives, SPPI-C2Py, SPPI-N1Py and SPPI-C2N1Py as efficient electron transport materials (ETMs) for blue fluorescent OLEDs (FOLEDs) and host materials for phosphorescent organic light emitting diodes...

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