scholarly journals Optimizing the internal electric field distribution of alternating current driven organic light-emitting devices for a reduced operating voltage

2014 ◽  
Vol 104 (7) ◽  
pp. 071105 ◽  
Author(s):  
Markus Fröbel ◽  
Simone Hofmann ◽  
Karl Leo ◽  
Malte C. Gather
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Alternating Current ◽  
Operating Voltage ◽  
Internal Electric Field ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices

Alternating Current Driven Green Transparent Organic Light-emitting Devices

2021 ◽  
Vol 42 (2) ◽  
pp. 153-157
Author(s):  
Xiang ZHANG ◽  
◽  
Yi-fan CHEN ◽  
Shi-hao LIU ◽  
Le-tian ZHANG ◽  
...  
Keyword(s):  
Alternating Current ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices

Internal Field Distribution in Organic Light Emitting Diodes with Double Layer Structure

1997 ◽  
Vol 488 ◽  
Author(s):  
C. Hochfilzer ◽  
T. Jost ◽  
A. Niko ◽  
W. Graupner ◽  
G. Leising ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Field Distribution ◽  
Double Layer ◽  
Layer Structure ◽  
Thick Layer ◽  
Internal Field ◽  
Internal Electric Field ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light

AbstractDouble layer organic light emitting devices (OLED) are constructed by evaporating tris(8 -hydroxy) quinoline aluminum (Alq3) on a spin cast thin film of a methyl substituted ladder type poly -para -phenylene (m -LPPP). A thick layer of Mg:Ag is used as the cathode material. These organic materials are very suitable for application in OLEDs both, as transporting materials as well as active layers. Alq3 predominantly transports electrons while m - LPPP is a conjugated polymer having higher hole mobilities. Due to these transport properties the formation and radiative recombination of the excitons in ITO/m -LPPP/Alq3/Mg:Ag devices occur close to the m -LPPP/Alq3 interface. We compare the device performance of OLEDs with varying Alq3 layer thickness (0, 50, 150, 300, 500Å) and constant m -LPPP layer thickness (900Å). A difference in the device parameters and performance as a function of the Alq3 layer thickness is observed. We analyze these results with respect to the internal electric field distribution of the double layer devices derived from electroabsorption measurements.

Efficiency Enhancement of Tandem Organic Light-Emitting Devices Fabricated Utilizing an Organic BEDT-TTF and HAT-CN Charge Generation Layer

2015 ◽  
Vol 15 (10) ◽  
pp. 8070-8074
Author(s):  
Dae Hun Kim ◽  
Tae Whan Kim
Keyword(s):  
Current Efficiency ◽  
Operating Voltage ◽  
Efficiency Enhancement ◽  
Charge Generation ◽  
Electrical And Optical Properties ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Highest Occupied Molecular Orbital ◽  
Organic Light Emitting Devices

The electrical and optical properties of tandem organic light-emitting devices (OLEDs) fabricated utilizing an organic bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF) and 1,4,5,8,9,11- hexaazatriphenylenehexacarbonitrile (HAT-CN) charge generation layer (CGL) were investigated to enhance their efficiency. While the operating voltage of the tandem OLEDs with a BEDT-TTF and HAT-CN CGL at 50 mA/cm2 was 11.2 V lower than that of the tandem OLEDs without a CGL, the current efficiency of the tandem OLEDs with a BEDT-TTF and a HAT-CN CGL at 50 mA/cm2 was 0.8 cd/A higher than that of the tandem OLEDs without a CGL. An increase in the current efficiency and a decrease in the operating voltage of the tandem OLEDs with a BEDT-TTF and an HAT-CN CGL were attributed to the enhancement of the electron injection due to its existence in the highest occupied molecular orbital level of the BEDT-TTF between the HAT-CN and the tris-(8- hydroxyquinoline)aluminum layer.

Recent Advances in Alternating Current-Driven Organic Light-Emitting Devices

2017 ◽  
Vol 29 (44) ◽  
pp. 1701441 ◽  
Author(s):  
Yufeng Pan ◽  
Yingdong Xia ◽  
Haijuan Zhang ◽  
Jian Qiu ◽  
Yiting Zheng ◽  
...  
Keyword(s):  
Alternating Current ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Recent Advances ◽  
Organic Light Emitting Devices
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