Extremely Low Operating Voltage Green Phosphorescent Organic Light-Emitting Devices

2013 ◽  
Vol 23 (44) ◽  
pp. 5550-5555 ◽  
Author(s):  
Hisahiro Sasabe ◽  
Hiromi Nakanishi ◽  
Yuichiro Watanabe ◽  
Shogo Yano ◽  
Masakatsu Hirasawa ◽  
...  
Keyword(s):  
Operating Voltage ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices

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.

scholarly journals Organic light-emitting devices based on conducting polymer treated with benzoic acid

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hwa Seung Kang ◽  
Dae Hun Kim ◽  
Tae Whan Kim
Keyword(s):  
Benzoic Acid ◽  
Mechanical Stability ◽  
Operating Voltage ◽  
Maximum Luminance ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices ◽  
Poly Styrene Sulfonate ◽  
Enhanced Conductivity

AbstractWe report on the enhanced conductivity of the benzoic-acid-treated poly(3,4-ethlenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) electrode for use in highly flexible, organic light-emitting devices (OLEDs). The conductivity of the benzoic-acid-treated PEDOT:PSS electrode increased from 1 to 1583.2 S/cm, in comparison with that of the pristine PEDOT:PSS electrode, due to a complex factor of the H+ mole % and the dielectric constant of the benzoic solution. Among the post-treatment methods of the PEDOT:PSS electrodes, the operating voltage at 1000 cd/m2 of OLEDs fabricated utilizing the PEDOT:PSS electrode with the benzoic acid treatment has the lowest value, and its maximum luminance is 24,400 cd/m2, which are 1.54 and 2.15 times higher than those of OLEDs using PEDOT:PSS electrodes treated with dimethyl sulfoxide and methanol, respectively. The luminance of a flexible OLED with a benzoic-acid-treated PEDOT:PSS electrode after 1400 bending cycles decreased to 83% of the initial luminance, resulting in excellent mechanical stability.

Efficiency Enhancement Mechanisms in Tandem Organic Light-Emitting Devices Fabricated Utilizing a Mixed LCV: HAT-CN Layer Embedded Into a Charge Generation Layer

2015 ◽  
Vol 15 (10) ◽  
pp. 8191-8194
Author(s):  
Eun Im Koh ◽  
Dae Hun Kim ◽  
Tae Whan Kim
Keyword(s):  
Current Efficiency ◽  
Mixed Layer ◽  
Operating Voltage ◽  
Charge Generation ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
The Matrix ◽  
Organic Light Emitting Devices ◽  
A Charge

Tandem organic light-emitting devices (OLEDs) with a mixed organic n-type 4,4′,4″-methylidynetris (n,n-dimethylaniline) and organic p-type 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile layer embedded into a charge generation layer (CGL) were fabricated to enhance their current efficiency. The operating voltage of the tandem OLEDs with a mixed layer at 10 mA/cm2 was 1 V lower than that of the tandem OLEDs without a mixed layer due to the electrons generated from the mixed layer. The matrix-assisted laser desorption-ionization-time-of-flight mass spectrometer spectra clarified the charge generation behaviors of the mixed layer into the CGL. The current efficiency of the tandem OLEDs with a mixed layer at 10 mA/cm2 was 48.2 cd/A, which was much larger than that without a mixed layer. The increase in the current efficiency for the tandem OLEDs was attributed to the enhancement of the electron injection efficiency in a CGL resulting from the insertion of the mixed layer.

The study of intramolecular decay and intermolecular energy transfer for phosphorescent organic light-emitting devices

2021 ◽  
Vol 23 (12) ◽  
pp. 7495-7503
Author(s):  
Wanlin Cai ◽  
Kai Ren ◽  
Ancong Zhao ◽  
Xiulan Wu ◽  
Rongxing He ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rational Design ◽  
Energy Transfer Efficiency ◽  
Transfer Efficiency ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Intermolecular Energy ◽  
Intermolecular Energy Transfer ◽  
Organic Light Emitting Devices

Compared to the PtOO7-based system, the greater EQE of the PtON7-based system is mainly governed by the stronger energy transfer efficiency (ηEET); thus, it is necessary to evaluate ηEET from hosts to guests for the rational design of OLEDs.

Mono-, di- and tri-nuclear PtII(C^N)(N-donor ligand)Cl complexes showing aggregation-induced phosphorescent emission (AIPE) behavior for efficient solution-processed organic light-emitting devices

2021 ◽  
Author(s):  
Xi Chen ◽  
Yuling Sun ◽  
Xinyi Zhao ◽  
Xuming Deng ◽  
Xiaolong Yang ◽  
...  
Keyword(s):  
Efficient Solution ◽  
Solution Processed ◽  
Donor Ligand ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices

Mono-, di- and tri-nuclear PtII(C^N)(N-donor ligand)Cl complexes Ph-PAYPt1, Ph-PAYPt2 and Ph-PAYPt3 are designed and prepared.

Dendritic Luminescent Gold(III) Complexes for Highly Efficient Solution-Processable Organic Light-Emitting Devices

2012 ◽  
Vol 52 (1) ◽  
pp. 446-449 ◽  
Author(s):  
Man-Chung Tang ◽  
Daniel Ping-Kuen Tsang ◽  
Maggie Mei-Yee Chan ◽  
Keith Man-Chung Wong ◽  
Vivian Wing-Wah Yam
Keyword(s):  
Efficient Solution ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Highly Efficient ◽  
Organic Light ◽  
Solution Processable ◽  
Organic Light Emitting Devices

Effect of BCP ultrathin layer on the performance of organic light-emitting devices

2008 ◽  
Vol 4 (5) ◽  
pp. 317-320 ◽  
Author(s):  
Hong Wang ◽  
Jun-sheng Yu ◽  
Lu Li ◽  
Xiao-qing Tang ◽  
Ya-dong Jiang
Keyword(s):  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices ◽  
Ultrathin Layer
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