Fusible Low Work Function Top Electrode for Vacuum-Free Perovskite Light-Emitting Diode Application: Role of OH-Terminated Sn Atoms at the Alloy Surface

2021 ◽  
Author(s):  
Ramesh Kumar ◽  
Jitendra Kumar ◽  
Monojit Bag
Keyword(s):  
Work Function ◽  
Light Emitting Diode ◽  
Alloy Surface ◽  
Light Emitting

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.

Anode modification of polymer light-emitting diode using graphene oxide interfacial layer: The role of ultraviolet-ozone treatment

2013 ◽  
Vol 103 (7) ◽  
pp. 073305 ◽  
Author(s):  
Xiao-Chen Jiang ◽  
Yan-Qing Li ◽  
Yan-Hong Deng ◽  
Qi-Qi Zhuo ◽  
Shuit-Tong Lee ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Interfacial Layer ◽  
Light Emitting Diode ◽  
Ozone Treatment ◽  
Light Emitting ◽  
Anode Modification ◽  
Polymer Light Emitting Diode

The role of poly(3,4-ethylenedioxythiophene):poly(styrenesulphonate) as a hole injection layer in a blue-emitting polymer light-emitting diode

2008 ◽  
Vol 104 (10) ◽  
pp. 104506 ◽  
Author(s):  
Sebastian Bange ◽  
Andriy Kuksov ◽  
Dieter Neher ◽  
Antje Vollmer ◽  
Norbert Koch ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Hole Injection ◽  
Light Emitting ◽  
Hole Injection Layer ◽  
Polymer Light Emitting Diode

scholarly journals OXIGÊNIO NO CONTEXTO DA COVID-19: O QUE SABEMOS SOBRE A MOLÉCULA QUE RESPIRAMOS E O PAPEL CENTRAL DA QUÍMICA

Química Nova ◽  
2021 ◽  
Author(s):  
Bruna Cerqueira ◽  
Bruna Silva ◽  
Rafael Campos ◽  
Lourenço Santana ◽  
Wilson Lopes ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Chemical Characterization ◽  
Point Of View ◽  
Oxygen Production ◽  
Oxygen Saturation Level ◽  
Light Emitting ◽  
Physical Chemical ◽  
Oxygen Cycle ◽  
Oxygen Concentrator

OXYGEN IN THE COVID-19 CONTEXT: WHAT WE KNOW ABOUT THE MOLECULE WE BREATHE AND THE CENTRAL ROLE OF CHEMISTRY. In this work, the role of chemistry in the coronavirus disease 2019 (COVID-19) pandemic is highlighted through the medical oxygen supply crises in Brazil, as an example of oxygen utility in health. Starting from oxygen chemical characterization, the oxygen cycle in nature is discussed to show how oxygen is formed through photosynthesis, followed by the description of the industrial oxygen production from atmospheric air, including physical-chemical aspects. The use of medical oxygen concentrator is presented and how this device works from the chemical point of view. Besides, the noninvasive and painless oximetry is described in terms of how oxygen saturation level in blood is measured using LED - light emitting diode.

Factors affecting the intention to adopt light-emitting diode lighting at home

2020 ◽  
Vol 52 (8) ◽  
pp. 1020-1039 ◽  
Author(s):  
NI Jaafar ◽  
A Sulaiman ◽  
S Moghavvemi ◽  
FP Tajudeen ◽  
F Dehdar
Keyword(s):  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Intention To Use ◽  
Factors Affecting ◽  
Light Emitting ◽  
Mediating Role ◽  
Intention To Adopt ◽  
Use Of Technology ◽  
The Relationship

This study investigates the significant factors affecting the adoption of light emitting diode lighting among households in Malaysia by conceptualizing and extending the unified theory of acceptance and use of technology through the adaptation of price value and the anticipated emotions of pride and guilt within the model. This study used the partial least squares technique to validate measurements and to test the research hypotheses. The results obtained from analysing 1075 valid survey questionnaires revealed the effects of performance expectancy, effort expectancy and price value on the intention to use light-emitting diodes among Malaysian households. While the results support the mediating role of attitude between the three variables and intention to use light-emitting diodes, the moderating role of anticipated pride on the relationship between attitude and intention to use light-emitting diodes was not supported. The findings confirm that guilt significantly moderates the relationship between attitude and intention.

scholarly journals Light-emitting diode assessment of dentinal defects: the role of presumed extraction forces

2017 ◽  
Vol 42 (3) ◽  
pp. 232 ◽  
Author(s):  
Marcelo Santos Coelho ◽  
Steven J. Card ◽  
Peter Z. Tawil
Keyword(s):  
Light Emitting Diode ◽  
Light Emitting

High Power 325 Light Emitting Diode Arrays by Flip-Chip Packaging

2002 ◽  
Vol 743 ◽  
Author(s):  
Ashay Chitnis ◽  
Maxim Shatalov ◽  
Vinod Adivarahan ◽  
Jian Ping Zhang ◽  
Shuai Wu ◽  
...  
Keyword(s):  
Thermal Management ◽  
Flip Chip ◽  
Heat Dissipation ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Flip Chip Packaging ◽  
Ultraviolet Light Emitting Diodes ◽  
Emission Light

ABSTRACTWe report flip-chip 325 nm emission light emitting diodes over sapphire with dc powers as high as 0.84 mW at 180mA and pulse powers as high as 6.68 mW at 1A. These values to date are the highest reported powers for such short wavelength emitters. Our data shows the device output power under dc operation to be limited by the package heat dissipation. A study is presented to determine the role of thermal management in controlling the power output for the reported 325 nm ultraviolet light emitting diodes.

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.

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