Temperature dependence of electric-field induced photoluminescence from an InGaN-based light-emitting diode

2001 ◽  
Vol 89 (10) ◽  
pp. 5779-5781 ◽  
Author(s):  
Hiromitsu Kudo ◽  
Tomoyuki Tanabe ◽  
Hiroki Ishibashi ◽  
Ruisheng Zheng ◽  
Yoichi Yamada ◽  
...  
Keyword(s):  
Electric Field ◽  
Temperature Dependence ◽  
Light Emitting Diode ◽  
Light Emitting

Anomalous Temperature Dependence of Solvent-Enhanced Dye Diffusion In Polymer Films

2002 ◽  
Vol 725 ◽  
Author(s):  
T. Graves-Abe ◽  
F. Pschenitzka ◽  
J.C. Sturm
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Temperature Dependence ◽  
Polymer Film ◽  
Light Emitting Diode ◽  
Solvent Vapor ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Thermally Driven

AbstractOne promising method to pattern full color polymer Organic Light-Emitting Diode (OLED) displays is to print dye from a pre-patterned organic film onto a spin-cast polymer and then diffuse the dye into the film at room temperature in a solvent vapor environment. This method utilizes the well-known tendency for a polymer film to absorb solvent vapor, which depresses the glass transition temperature of the polymer and dramatically increases diffusion the dye. In this work, we have studied the temperature dependence of this process. The dye coumarin 6 (C6) was transferred onto films consisting of 2-(4-biphenylyl)-5-(4-tert-butylphenyl)- 1,3,4-oxadiazole (PBD) mixed with the polymer poly(9-vinylcarbazole) (PVK). Samples were then placed on a heated stage in a chamber and exposed to acetone vapor to diffuse the C6 into the polymer film. The profile of the diffused dye was determined by depthdependent photoluminescence measurements and Secondary Ion Mass Spectroscopy. We observed that the amount of diffused dye decreased at higher temperatures, in contrast to conventional thermally-driven diffusion. The results are understood by noting that the decrease in the polymer glass-transition temperature and the corresponding rapid increase in dye diffusivity depend on the quantity of solvent absorbed by the polymer, which decreases as the temperature of the polymer is raised.

scholarly journals Performance of Injection-Limited Polymer Light-Emitting Diodes

2002 ◽  
Vol 725 ◽  
Author(s):  
Paul W.M. Blom ◽  
Teunis van Woudenbergh ◽  
Hans Huiberts
Keyword(s):  
Electric Field ◽  
Current Density ◽  
Light Emitting Diode ◽  
Numerical Calculations ◽  
Hole Injection ◽  
Phenylene Vinylene ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes ◽  
Injection Barrier ◽  
Very High

AbstractThe electro-optical characteristics of a polymer light emitting diode (PLED) with a strongly reduced hole injection have been investigated. The device consists of a poly-p-phenylene vinylene semiconductor with a Ag hole injecting contact, which has an injection barrier of about 1 eV. It is observed that the light and current density of such an injection-limited PLED strongly exceed the expected device characteristics. Numerical calculations of the injection-limited PLED show that the enhanced performance can be explained by a very high electric field at the hole injecting contact, due to trapped electrons.

ZnO single microwire homojunction light emitting diode grown by electric field assisted chemical vapor deposition

2015 ◽  
Vol 3 (18) ◽  
pp. 4678-4682 ◽  
Author(s):  
Qiu-Ju Feng ◽  
Hong-Wei Liang ◽  
Yi-Ying Mei ◽  
Jia-Yuan Liu ◽  
C. C. Ling ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Electric Field ◽  
Vapor Deposition ◽  
Large Scale ◽  
Light Emitting Diode ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Deposition Method ◽  
Light Emitting

A single large-scale ZnO microwire (MW) homojunction LED is fabricated by an electric field assisted chemical vapor deposition method.

Superb lifetime of blue organic light-emitting diodes through engineering interface carrier blocking layers and adjusting electron leakage and an unusual efficiency variation at low electric field

2018 ◽  
Vol 6 (31) ◽  
pp. 8472-8478 ◽  
Author(s):  
Taekyung Kim ◽  
Kyung Hyung Lee ◽  
Jun Yeob Lee
Keyword(s):  
Electric Field ◽  
Electron Density ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Electron Leakage ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Long Lifetime

An extremely long lifetime blue organic light-emitting diode (OLED) was developed through managing the electron density and an S-shaped variation of efficiency in blue fluorescent organic light-emitting diodes (FOLEDs) using carrier blocking layers and systematically analyzed in conjunction with the efficiency–lifetime interrelationship.

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