Application of High Work Function Anode for Organic Light Emitting Diode

2009 ◽  
Vol 514 (1) ◽  
pp. 115/[445]-121/[451] ◽  
Author(s):  
Ji-Yun Chun ◽  
Jin-Woo Han ◽  
Dae-Shik Seo
Keyword(s):  
Work Function ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
High Work Function ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
High Work

scholarly journals Unravelling the electron injection/transport mechanism in organic light-emitting diodes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tsubasa Sasaki ◽  
Munehiro Hasegawa ◽  
Kaito Inagaki ◽  
Hirokazu Ito ◽  
Kazuma Suzuki ◽  
...  
Keyword(s):  
Work Function ◽  
Transport Mechanism ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Electron Injection ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Materials Used

AbstractAlthough significant progress has been made in the development of light-emitting materials for organic light-emitting diodes along with the elucidation of emission mechanisms, the electron injection/transport mechanism remains unclear, and the materials used for electron injection/transport have been basically unchanged for more than 20 years. Here, we unravelled the electron injection/transport mechanism by tuning the work function near the cathode to about 2.0 eV using a superbase. This extremely low-work function cathode allows direct electron injection into various materials, and it was found that organic materials can transport electrons independently of their molecular structure. On the basis of these findings, we have realised a simply structured blue organic light-emitting diode with an operational lifetime of more than 1,000,000 hours. Unravelling the electron injection/transport mechanism, as reported in this paper, not only greatly increases the choice of materials to be used for devices, but also allows simple device structures.

scholarly journals Differences in ITO Surfaces According to the Formation of Aromatic Rings and Aliphatic Self-Assembled Monolayers for Organic Light-Emitting Diode Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2520
Author(s):  
Myung-Gyun Baek ◽  
Sang-Geon Park
Keyword(s):  
Contact Angle ◽  
Work Function ◽  
Light Emitting Diode ◽  
Substrate Surface ◽  
Self Assembled Monolayers ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Assembled Monolayers ◽  
Self Assembled

In this study, we investigated the effects on the characteristic changes in OLED devices of using self-assembled monolayers with different functional groups as the hole injection layer, resulting in changes in their performance. Thus, we confirmed that it is possible to control the wetting properties, surface roughness, and work function of the indium tin oxide (ITO) surface by introducing self-assembled monolayers (SAMs). The contact angle measurements confirmed that the substrate surface contact angle tended to increase with SAM deposition. In addition, AFM measurements confirmed that the substrate surface roughness tended to decrease when SAM was deposited on the surface. Finally, it was confirmed through the work function measurement results that the work function increased when the ITO surface was modified by SAM. Furthermore, compared to OLEDs using only the ITO anode, the SAM-modified device showed a higher current density (359.68 A/cm2), improved brightness (76.8 cd/cm2), and a smaller turn-on voltage (7 V). This approach provides a simple route for fabricating organic light-emitting diode applications.

Use of anodes with tunable work function for improving organic light-emitting diode performance

2015 ◽  
Vol 357 ◽  
pp. 539-542 ◽  
Author(s):  
Meng-Chi Li ◽  
Yen-Ming Lo ◽  
Shih-Fang Liao ◽  
Hsi-Chao Chen ◽  
Hsin-Hua Chang ◽  
...  
Keyword(s):  
Work Function ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light
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