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.

Solution-processable bipolar host materials composed of fluorenyl, carbazolyl and 1,3,4-oxadiazolyl derivatives: synthesis and application in phosphorescent organic light-emitting diodes

2016 ◽  
Vol 4 (22) ◽  
pp. 5091-5101 ◽  
Author(s):  
Tso-Hsing Fan ◽  
Yun Chen
Keyword(s):  
Spin Coating ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Coating Process ◽  
Emission Layer ◽  
Light Emitting ◽  
Spin Coating Process ◽  
Organic Light ◽  
Host Materials ◽  
Solution Processable

Two new bipolar compounds were synthesized and applied as hosts for phosphorescent organic light-emitting diodes, using a spin-coating process to cast a homogeneous emission layer. Their device performances outperform conventional host poly(9-vinylcarbazole).

Eu(tta)3DPPZ-based organic light-emitting diodes: spin-coating vs vacuum-deposition

2021 ◽  
Author(s):  
Kirill M Kuznetsov ◽  
Makarii I. Kozlov ◽  
Andrey N Aslandukov ◽  
Andrey A Vashchenko ◽  
Alexey Medved'ko ◽  
...  
Keyword(s):  
Spin Coating ◽  
Mixed Ligand Complex ◽  
Mixed Ligand ◽  
Organic Light Emitting Diodes ◽  
Vacuum Deposition ◽  
Ligand Complex ◽  
Emission Layer ◽  
Light Emitting ◽  
Organic Light ◽  
Layer Deposition

The effect of the emission layer deposition method on the characteristics of OLEDs was studied on the example of the europium mixed ligand complex Eu(tta)3DPPZ (tta: 2-thenoyltrifluoroacetone, DPPZ: dipyrido[3,2-a:2’c,3’c-c]phenazine), which...

scholarly journals Uniform and bright light emission from a 3D organic light-emitting device fabricated on a bi-convex lens by a vortex-flow-assisted solution-coating method

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Byoungchoo Park ◽  
Seo Yeong Na ◽  
In-Gon Bae
Keyword(s):  
Spin Coating ◽  
Vortex Flow ◽  
Line Tension ◽  
Fluorescent Light ◽  
Coating Process ◽  
Coating Solution ◽  
Light Emitting ◽  
Spin Coating Process ◽  
Convex Lens ◽  
Organic Light

AbstractWe herein present the results of a study on the novel fabrication process of uniform and homogeneous semiconducting polymer layers, in this case hole-injecting and fluorescent light-emitting layers that were produced by a simple solution-coating process for 3D conformal organic light-emitting diodes (3D OLEDs) on curvilinear surfaces. The solution-coating process used was a newly developed method of vortex-flow-assisted solution-coating with the support of spinning of the coating solution. It is shown that the vortex-flow-assisted spin-coating process can produce high-quality thin films at nanoscale thicknesses by controlling the liquid surface of the coating solutions, which can easily be adjusted by changing the spinning speed, even on complex curvilinear surfaces, i.e., a quasi-omnidirectional coating. This excellent film-forming ability without any serious film defects is mainly due to the reduction of line tension among the solution, air, and the substrate at the contact line due to vortex flows of the coating solution on the substrate during the vortex-spin-coating process. As a proof of concept, we present vortex-spin-coated 3D OLEDs fabricated on bi-convex lens substrates which exhibit excellent device performance with high brightness and current efficiency levels comparable to those of a conventional spin-coated 2D planar OLED on a flat substrate. It is also shown that the EL emission from the 3D OLED on the bi-convex lens substrate exhibits a diffusive Lambertian radiation pattern. The results here demonstrate that the vortex-flow-assisted spin-coating process is a promising approach for producing efficient and reliable next-generation OLEDs for 3D conformal opto-electronics.

scholarly journals Synthesis, crystal structure and photophysical properties of bis[2,6-difluoro-3-(pyridin-2-yl)pyridine-κN](trifluoromethanesulfonato-κO)silver(I)

2021 ◽  
Vol 77 (12) ◽  
Author(s):  
Suk-Hee Moon ◽  
Sanghyun Paek ◽  
Youngjin Kang
Keyword(s):  
Title Compound ◽  
Photophysical Properties ◽  
Three Dimensional ◽  
Organic Light Emitting Diodes ◽  
Broad Emission Band ◽  
Supramolecular Network ◽  
Coordination Environment ◽  
Light Emitting ◽  
Organic Light ◽  
Broad Emission

In the title compound, [Ag(CF3SO3)(C10H6F2N2)2], the AgI centre adopts a highly distorted trigonal–planar coordination environment resulting from its coordination by one O atom of the trifluoromethanesulfonate anion and the pyridine N atoms of two crystallographically independent 2′,6′-difluoro-2,3′-bipyridine ligands, which display very similar conformations to one another. Pairwise Ag...O–SO2CF3 − [Ag...O = 2.8314 (14) Å] interactions and intermolecular C—H...O interactions between inversion-related units lead to the formation of an eight-membered cyclic dimer in which the silver atoms are separated by 6.2152 (3) Å. In the crystal, the dimers are linked through C—H...O hydrogen bonds, halogen...π and weak π–π stacking interactions, resulting in the formation of a three-dimensional supramolecular network. The title compound exhibits a strong and broad emission band from 400 nm to 550 nm in solution and its photoluminescence quantum efficiency is estimated to be ca 0.2, indicating that the title compound could have applications as an emitting material in organic light-emitting diodes (OLEDs).

Thermally activated delayed fluorescence of co-deposited copper(i) complexes: cost-effective emitters for highly efficient organic light-emitting diodes

2017 ◽  
Vol 5 (28) ◽  
pp. 6982-6988 ◽  
Author(s):  
Zixing Wang ◽  
Jun Zhu ◽  
Zhiwei Liu ◽  
Peng Wu ◽  
Hedan Wang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Cost Effective ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Copper Iodide ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Organic Light

TADF copper(i) complexes were made by co-depositing carboline derivatives and copper iodide. δ-Carboline derivative-based OLEDs showed 6 times higher efficiency than α-carboline derivative-based ones.

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