scholarly journals Improving Light Extraction of Organic Light-Emitting Devices by Attaching Nanostructures with Self-Assembled Photonic Crystal Patterns

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Kai-Yu Peng ◽  
Da-Hua Wei
Keyword(s):  
Photonic Crystal ◽  
Electronic Device ◽  
Research Work ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Potential Applications ◽  
Self Assembled ◽  
The One ◽  
Pet Films

A single-monolayered hexagonal self-assembled photonic crystal (PC) pattern fabricated onto polyethylene terephthalate (PET) films by using simple nanosphere lithography (NSL) method has been demonstrated in this research work. The patterned nanostructures acted as a scattering medium to extract the trapped photons from substrate mode of optical-electronic device for improving the overall external quantum efficiency of the organic light-emitting diodes (OLEDs). With an optimum latex concentration, the distribution of self-assembled polystyrene (PS) nanosphere patterns on PET films can be easily controlled by adjusting the rotation speed of spin-coater. After attaching the PS nanosphere array brightness enhancement film (BEF) sheet as a photonic crystal pattern onto the device, the luminous intensity of OLEDs in the normal viewing direction is 161% higher than the one without any BEF attachment. The electroluminescent (EL) spectrum of OLEDs with PS patterned BEF attachment also showed minor color offset and superior color stabilization characteristics, and thus it possessed the potential applications in all kinds of display technology and solid-state optical-electronic devices.

Near Infrared Fluorescent and Phosphorescent Organic Light-Emitting Devices

2009 ◽  
Vol 1154 ◽  
Author(s):  
Yixing Yang ◽  
Richard Farley ◽  
Timothy Steckler ◽  
Jonathan Sommer ◽  
Sang Hyun Eom ◽  
...  
Keyword(s):  
Near Infrared ◽  
Emission Peak ◽  
Organometallic Complex ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Nir Light ◽  
Organic Light ◽  
Potential Applications ◽  
Donor Acceptor ◽  
Organic Light Emitting Devices

AbstractOrganic light-emitting devices (OLEDs) emitting near-infrared (NIR) light have many potential applications, yet the efficiency of these devices remains very low, typically ˜0.1% or less. Here we report efficiency NIR OLEDs based on two fluorescent donor-acceptor-donor oligomers and a phosphorescent Pt-containing organometallic complex. External quantum efficiencies in the range of 0.5–3.8% with emission peak ranging from 700 to 890 nm have been achieved.

Top-emitting white organic light-emitting devices with a one-dimensional metallic-dielectric photonic crystal anode

2009 ◽  
Vol 34 (18) ◽  
pp. 2703 ◽  
Author(s):  
Wenyu Ji ◽  
Letian Zhang ◽  
Tianyu Zhang ◽  
Guoqiang Liu ◽  
Wenfa Xie ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Light Emitting ◽  
One Dimensional ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices

Electrochemical Depositon of End-Capped Triarylamine and CBP Dendrimers: Alternate Technique for the Fabrication of Organic Light-Emitting Devices

2006 ◽  
Vol 965 ◽  
Author(s):  
Ho-Jin Son ◽  
Won-Sik Han ◽  
Ji-Yun Chun ◽  
Kyung Ryang Wee ◽  
Dae Hyun Kim ◽  
...  
Keyword(s):  
Electrochemical Deposition ◽  
Methylene Chloride ◽  
The Novel ◽  
Polymeric Precursor ◽  
Carbosilane Dendrimers ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
The One ◽  
Deposition Control

ABSTRACTCarbosilane dendrimers adorned with either triarylamine or carbazole units in their periphery exhibit novel electrochemical behavior in which the electrochemical deposition is controlled by dendrite generation. In addition, the deposited layers remained intact in the depositing solvent, methylene chloride, allowing a second layer to be deposited on top of the first layer. We have sought to establish the suitability of this electrochemical deposition technique for use in the construction of multi-layer OLEDs, which cannot be fabricated via conventional spin-coating with a polymeric precursor. Thus, the electrochemical deposition-based process could potentially offer an ideal combination of deposition control on the one hand and multi-layer fabrication on the other. We report herein the novel electrochemical deposition behavior of arylamine or carbazole end-capped carbosilane dendrimers of the type GnNPB or GnCBP (n = 1-4) and their use for the formation of multi-layer devices for OLEDs.

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