Three-Color Doping of Polymer Oleds by Masked Dye Diffusion

1999 ◽  
Vol 558 ◽  
Author(s):  
F. Pschenitzka ◽  
J. C. Sturm
Keyword(s):  
Polymer Film ◽  
Nile Red ◽  
Organic Light Emitting Diodes ◽  
Large Area ◽  
Light Emitting ◽  
Dye Diffusion ◽  
Materials Used ◽  
Integrated Device ◽  
Coumarin 6 ◽  
Transport Molecules

ABSTRACTA method to locally pattern the distribution of dye by diffusion into the polymer film of organic light-emitting diodes is introduced. Using a large-area diffusion source, the diffusion of dye into the polymer film can be controlled with a shadow mask. The materials used are the polymer poly(9-vinylcarbazole) (PVK) combined with electron transport molecules (PBD), and the dyes bimane, coumarin 6 and Nile red. The temperature dependence of the diffusion is investigated along with the effect of annealing of the polymer film. A model of the dye distribution is introduced and estimations of the dye profile based on this model and PL measurement are discussed. A 3-color integrated device was demonstrated.

Solvent-enhanced Dye Diffusion in Polymer This-Films for OLED Application

2001 ◽  
Vol 665 ◽  
Author(s):  
F. Pschenitzka ◽  
K. Long ◽  
J. C. Sturm
Keyword(s):  
Polymer Film ◽  
Light Emitting Diode ◽  
Nile Red ◽  
Dye Transfer ◽  
Solvent Vapor ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Solvent Absorption ◽  
Dye Diffusion ◽  
Materials Used

ABSTRACTA method of solvent-enhanced dye diffusion in polymer films for organic light-emitting diode (OLED) application is introduced. After an initial dye transfer from a dye source substrate into the top of the electractive polymer film, the device substrate is then exposed to solvent vapor. Due to solvent absorption by the polymer film, the glass transition temperature of the polymer is significantly decreased, which leads to greatly enhanced diffusion of the dye in the polymer film. Secondary ion mass spectroscopy shows that the temperature for dye diffusion can be decreased by 150 °C. OLEDs with 0.4% external quantum efficiency were demonstrated. The materials used are the polymer poly(9-vinylcarbazole) (PVK) combined with electron transport molecules (PBD), and the dyes coumarin 47, coumarin 6 and Nile red.

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.

Passive cooling of large-area organic light-emitting diodes

2013 ◽  
Vol 14 (8) ◽  
pp. 1939-1945 ◽  
Author(s):  
Philipp Schwamb ◽  
Thilo C.G. Reusch ◽  
Christoph J. Brabec
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Passive Cooling ◽  
Large Area ◽  
Light Emitting ◽  
Organic Light

Simple fabrication of a three-dimensional porous polymer film as a diffuser for organic light emitting diodes

Nanoscale ◽  
2014 ◽  
Vol 6 (23) ◽  
pp. 14446-14452 ◽  
Author(s):  
Byung Wan Lim ◽  
Min Chul Suh
Keyword(s):  
Polymer Film ◽  
Spin Coating ◽  
Three Dimensional ◽  
Cost Effective ◽  
Porous Polymer ◽  
Organic Light Emitting Diodes ◽  
Coating Process ◽  
Light Emitting ◽  
Organic Light ◽  
Ultrasonic Humidifier

We have investigated a simple and cost-effective fabrication method for a porous polymer film employing the spin-coating process during continuous supply of water droplets by an ultrasonic humidifier.

Surface Cleaning Challenges for Organic Light Emitting Diodes

2021 ◽  
Vol 314 ◽  
pp. 3-8
Author(s):  
Noel Giebink
Keyword(s):  
Light Emitting Diodes ◽  
Surface Cleaning ◽  
Organic Light Emitting Diodes ◽  
Large Area ◽  
Light Emitting ◽  
Organic Light ◽  
Organic Optoelectronic Devices ◽  
Soft Thin Film ◽  
Organic Optoelectronic

Organic optoelectronic devices such as light-emitting diodes and solar cells present unique challenges for surface cleaning and preparation because of their large area and the ‘soft’, thin film nature of the materials involved. This paper gives an introduction to this class of semiconductor devices and covers a recent example of how surface cleaning impacts the long-term reliability of organic light-emitting diodes being commercialized for solid-state lighting.

Large area organic light emitting diodes with multilayered graphene anodes

2012 ◽  
Author(s):  
Jaehyun Moon ◽  
Joohyun Hwang ◽  
Hong Kyw Choi ◽  
Taek Yong Kim ◽  
Sung-Yool Choi ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Large Area ◽  
Light Emitting ◽  
Organic Light

A novel intermediate connector with improved charge generation and separation for large-area tandem white organic lighting devices

2014 ◽  
Vol 2 (48) ◽  
pp. 10403-10408 ◽  
Author(s):  
Lei Ding ◽  
Yan-Qiu Sun ◽  
Hua Chen ◽  
Feng-Shuo Zu ◽  
Zhao-Kui Wang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Large Area ◽  
Charge Generation ◽  
Light Emitting ◽  
Organic Light

An intermediate connector is developed for fabricating tandem white organic light-emitting diodes.

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