scholarly journals Highly Efficient Single-Layer Phosphorescent Organic Light-Emitting Diodes Based on Co-Host Structure

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2029
Author(s):  
Tianyu Zhang ◽  
Asu Li ◽  
Ren Sheng ◽  
Mingyang Sun ◽  
Ping Chen
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Single Layer ◽  
Charge Carriers ◽  
Organic Light Emitting Diodes ◽  
Superior Performance ◽  
Light Emitting ◽  
Organic Light ◽  
Exciton Recombination ◽  
Host Structure

High-efficiency single-layer organic light-emitting diodes (OLEDs) based on a simple structure doped with iridium(III) bis(4-phenylthieno[3,2-c]pyridinato-N,C2′) acetylacetonate (PO-01) as emission dyes are realized, achieving maximum current efficiency (CE) and power efficiency (PE) of 37.1 cd A−1 and 33.3 lm W−1 as well as low turn-on voltage of 3.31 V. Such superior performance is mainly attributed to the employment of a uniform co-host structure and assisted charge transport property of phosphors dyes, which were in favor of the balance of charge carrier injection and transport in the single emitting layer (EML). Moreover, systematic researches on the position of exciton recombination region and the dopant effect on charge carriers were subsequently performed to better understand the operational mechanism. It could be experimentally found that the orange emitting dopants promoted the acceleration of the charge carriers transport and raised the exciton recombination efficiency, eventually leading to an excellent performance of single-layer OLEDs.

High efficiency yellow organic light emitting diodes with a balanced carrier injection co-host structure

2013 ◽  
Vol 1 (33) ◽  
pp. 5110 ◽  
Author(s):  
Jwo-Huei Jou ◽  
Hui-Huan Yu ◽  
You-Xing Lin ◽  
Jing-Ru Tseng ◽  
Shiang-Hau Peng ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Carrier Injection ◽  
Light Emitting ◽  
Organic Light ◽  
Host Structure

scholarly journals Reduced Efficiency Roll-Off in White Phosphorescent Organic Light-Emitting Diodes Based on Double Emission Layers

Molecules ◽  
2019 ◽  
Vol 24 (1) ◽  
pp. 211
Author(s):  
Ren Sheng ◽  
Ying Gao ◽  
Asu Li ◽  
Yu Duan ◽  
Yi Zhao ◽  
...  
Keyword(s):  
Carrier Transport ◽  
Doping Concentration ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Maximum Efficiency ◽  
Light Emitting ◽  
Organic Light ◽  
Exciton Recombination ◽  
Low Efficiency

We demonstrate high-efficiency white phosphorescent organic light-emitting diodes with low efficiency roll-off. The feature of the device concept is employing two phosphorescent emission layers (EMLs) separated by a mixed interlayer. Both the EMLs are doped by two phosphorescent dyes. The resulting white device with the optimized doping concentration shows a maximum efficiency of 31.0 cd/A with extremely low efficiency roll-off of 30.7 cd/A at 1000 cd/m2, 27.2 cd/A at 5000 cd/m2, and 25.5 cd/A at 10,000 cd/m2, respectively, without any outcoupling structures. This is enabled by the balanced charge carrier transport in EMLs, leading to broader exciton recombination zone.

Efficient and bright phosphorescent organic light-emitting diodes adopting MoO3/PEDOT:PSS as dual hole injection layers

2019 ◽  
Vol 33 (24) ◽  
pp. 1950284
Author(s):  
Nan Zhang ◽  
Yang Chen ◽  
Yan-Hui Wang
Keyword(s):  
Indium Tin Oxide ◽  
High Performance ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Acid Corrosion ◽  
Organic Light Emitting Diodes ◽  
Superior Performance ◽  
Hole Injection ◽  
Light Emitting ◽  
Organic Light

It has been demonstrated that high efficiency and brightness can be achieved in phosphorescent organic light-emitting diodes (PHOLEDs) by using molybdenum oxide (MoO3)/poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) as dual hole injection layers (HILs) on indium tin oxide (ITO) substrate. The dual HILs were simply fabricated by spin-coating PEDOT:PSS solution on a thin MoO3 layer deposited by vacuum thermal evaporation. This work reveals that PEDOT:PSS coating on MoO3 resulted in a smoother surface, simultaneously MoO3 lamella prevented acid corrosion of PEDOT:PSS on ITO. Meanwhile, with the insertion of PEDOT:PSS and MoO3 as HILs between anode and hole transporting layer (HTL), the energy barrier has been reduced and gave rise to effective hole injection. OLEDs with dual HILs resulted in the maximum current efficiency (CE) of 61.3 cd A[Formula: see text] and maximum luminance of 112200 cd cm[Formula: see text], which showed a superior performance compared to those devices with single HIL of PEDOT:PSS or MoO3. Our results proved the composition of PEDOT:PSS and MoO3 as HILs were beneficial for high performance OLEDs.

Controlling charge balance and exciton recombination by bipolar host in single-layer organic light-emitting diodes

2010 ◽  
Vol 108 (3) ◽  
pp. 034508 ◽  
Author(s):  
Xianfeng Qiao ◽  
Youtian Tao ◽  
Qiang Wang ◽  
Dongge Ma ◽  
Chuluo Yang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Single Layer ◽  
Organic Light Emitting Diodes ◽  
Charge Balance ◽  
Light Emitting ◽  
Organic Light ◽  
Exciton Recombination

High efficiency red phosphorescent organic light-emitting diodes with single layer structure

2010 ◽  
Vol 11 (2) ◽  
pp. 179-183 ◽  
Author(s):  
Woo Sik Jeon ◽  
Tae Jin Park ◽  
Kyeong Heon Kim ◽  
Ramchandra Pode ◽  
Jin Jang ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Layer Structure ◽  
Single Layer ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

scholarly journals Universal host materials for red, green and blue high-efficiency single-layer phosphorescent organic light-emitting diodes

2020 ◽  
Vol 8 (46) ◽  
pp. 16354-16367
Author(s):  
Fabien Lucas ◽  
Cassandre Quinton ◽  
Sadiara Fall ◽  
Thomas Heiser ◽  
Denis Tondelier ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Single Layer ◽  
Organic Light Emitting Diodes ◽  
Device Structure ◽  
Organic Electronic ◽  
Light Emitting ◽  
Organic Light ◽  
Host Materials ◽  
The Future

As simplifying the device structure is a key step for the future of organic electronic, we report herein high efficiency universal host materials for red, green and blue Single-Layer Phosphorescent OLEDs.

High efficiency warm white organic light-emitting diodes with precise confinement of charge carriers and excitons in the exciplex host system

2019 ◽  
Vol 7 (23) ◽  
pp. 7114-7120 ◽  
Author(s):  
Shian Ying ◽  
Jiakun Yuan ◽  
Shuai Zhang ◽  
Qian Sun ◽  
Yanfeng Dai ◽  
...  
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Charge Carriers ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Host System ◽  
Organic Light ◽  
System P

A high-performance WOLED with stable spectrum emission was achieved by the ratio regulation between the HTM and ETM in the exciplex host system.

scholarly journals Management of Exciton for Highly-Efficient Hybrid White Organic Light-Emitting Diodes with a Non-Doped Blue Emissive Layer

Molecules ◽  
2019 ◽  
Vol 24 (22) ◽  
pp. 4046
Author(s):  
Wei Luo ◽  
Xing Chen ◽  
Shuang-Qiao Sun ◽  
Yi-Jie Zhang ◽  
Tong-Tong Wang ◽  
...  
Keyword(s):  
Power Efficiency ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Fluorescent Dyes ◽  
Organic Light Emitting Diodes ◽  
Superior Performance ◽  
Emission Region ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Light

Hybrid white organic light-emitting diodes (WOLEDs) have drawn great attention both for display and solid-state lighting purposes because of the combined advantages of desirable stability of fluorescent dyes and high efficiency of phosphorescent materials. However, in most WOLEDs, obtaining high efficiency often requires complex device structures. Herein, we achieved high-efficiency hybrid WOLEDs using a simple but efficacious structure, which included a non-doped blue emissive layer (EML) to separate the exciton recombination zone from the light emission region. After optimization of the device structure, the WOLEDs showed a maximum power efficiency (PE), current efficiency (CE), and external quantum efficiency (EQE) of 82.3 lm/W, 70.0 cd/A, and 22.2%, respectively. Our results presented here provided a new option for promoting simple-structure hybrid WOLEDs with superior performance.

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