Effects of Thickness of Organic and Multilayer Anode on Luminance Efficiency in Top-Emission Organic Light Emitting Diodes

2006 ◽  
Vol 45 (4B) ◽  
pp. 3717-3720 ◽  
Author(s):  
Shin-Ju Lin ◽  
Han-Yi Ueng ◽  
Fuh-Shyang Juang
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Multilayer Anode ◽  
Luminance Efficiency

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.

Improvement in Luminance Efficiency by Insertion of Buffer Layers in Flexible Organic Light-Emitting Diodes

2006 ◽  
Vol 45 (4B) ◽  
pp. 3729-3732 ◽  
Author(s):  
Tsung-Hsien Yang ◽  
Fuh-Shyang Juang ◽  
Yu-Sheng Tsai ◽  
Wen-Kai Kuo ◽  
Meiso Yokoyama
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Buffer Layers ◽  
Light Emitting ◽  
Organic Light ◽  
Luminance Efficiency

9-(10-phenylanthracen-9-yl)-Benzo[b]Fluoreno[3,4-d] Thiophene Derivatives for Blue Organic Light-Emitting Diodes

2021 ◽  
Vol 21 (7) ◽  
pp. 3914-3918
Author(s):  
Beomsu Jang ◽  
Giwoong Han ◽  
Kiju Kim ◽  
Hakjun Lee ◽  
Youngkwan Kim ◽  
...  
Keyword(s):  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Blue Fluorescence ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Light ◽  
Thiophene Derivatives ◽  
Cie Coordinates ◽  
Luminance Efficiency

In this study, two blue fluorescence materials using phenylanthracene-substituted fluorene derivatives were synthesized and characterized for organic light-emitting diodes (OLEDs). To study their electroluminescent properties, OLED devices were fabricated using these two materials as emissive layer (EML). A device using 7,7-diphenyl-9-(10-phenylanthracen-9-yl)-7H-benzo[b]fluoreno[3,4-d]thiophene in emitting layer showed the highest value of EQE value which is 3.51%. It also showed the luminance efficiency of 3.22 cd/A and power efficiency of 2.89 lm/W with the CIE coordinates (0.15, 0.09).

9-(10-phenylanthracen-9-yl)-7H-Fluoreno[4, 3-b]Benzofuran Derivatives for Blue Organic Light-Emitting Diodes

2021 ◽  
Vol 16 (5) ◽  
pp. 844-848
Author(s):  
Beomsu Jang ◽  
Giwoong Han ◽  
Kiju Kim ◽  
Hakjun Lee ◽  
Young Kwan Kim ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Maximum Luminance ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Light ◽  
Luminance Efficiency

In this study, two blue fluorescent using phenylanthracene-substituted furan derivatives were synthesized for organic light-emitting diodes (OLEDs) and subsequently characterized. To study the electroluminescent properties of the materials, OLED devices were fabricated using these two materials as an emissive layer (EML). The device using 7,7-diphenyl-9-(10-phenylanthracen-9-yl)-7H-fluoreno[4,3-b]benzofuran in the emitting layer showed the highest external quantum efficiency (EQE) value, 3.10%. It also showed the maximum luminance efficiency of 2.41 cd/A and maximum power efficiency of 1.90 lm/W with CIE coordinates of (0.15, 0.08).

Organic light-emitting diodes with hydrogenated In-doped ZnO thin films as transparent conductive electrodes

2008 ◽  
Vol 23 (6) ◽  
pp. 1674-1681 ◽  
Author(s):  
Young Ran Park ◽  
Young Sung Kim
Keyword(s):  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Control Device ◽  
Hydrogen Gas ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Doped Zno ◽  
Transparent Conductive Electrodes ◽  
Luminance Efficiency

Hydrogenated In-doped ZnO (ZIO:H) films grown at different ratios, R, of hydrogen to argon were deposited at a substrate temperature of 100 °C for the organic light-emitting diodes (OLEDs). The OLEDs with the ZIO:H (R = 0.08) anode achieved a maximum luminance efficiency of 3.4 cd/A and a power efficiency of 0.6 lm/W, which are as good as the values of the control device fabricated on a tin-doped indium oxide (ITO) anode. This indicates that the efficiency of the OLEDs is critically affected by the ratio of injected hydrogen gas during the deposition of the ZIO and that the ZIO:H developed herein is promising as an alternative to conventional ITO.

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