Harnessing charge and exciton distribution towards extremely high performance: the critical role of guests in single-emitting-layer white OLEDs

2015 ◽  
Vol 2 (5) ◽  
pp. 536-544 ◽  
Author(s):  
Baiquan Liu ◽  
Lei Wang ◽  
Dongyu Gao ◽  
Miao Xu ◽  
Xuhui Zhu ◽  
...  
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Critical Role ◽  
Trade Off ◽  
White Oleds ◽  
Low Efficiency ◽  
Exciton Distribution

The simplicity/extremely high efficiency/low efficiency roll-off/stable color trade-off has been accomplished in a single-EML WOLED.

Tetraphenylbenzene-based AIEgens: the Horizontally Oriented Emitters for highly Efficient Non-doped Deep Blue OLEDs and Host for High-Performance Hybrid WOLEDs

2020 ◽  
Author(s):  
Pengbo Han ◽  
Zeng Xu ◽  
Chengwei Lin ◽  
Dongge Ma ◽  
Anjun Qin ◽  
...  
Keyword(s):  
High Performance ◽  
General Strategy ◽  
Flat Panel Displays ◽  
Light Emitting ◽  
Horizontal Orientation ◽  
Deep Blue ◽  
Full Color ◽  
High Emission ◽  
White Oleds ◽  
Low Efficiency

Deep blue organic-emitting fluorophores are crucial for application in white lighting and full color flat-panel displays but emitters with high color quality and efficiency are rare. Herein, novel deep blue AIE luminogens (AIEgens) with various donor units and an acceptor of cyano substituted tetraphenylbenzene (TPB) cores were developed and used to fabricate non-doped deep blue and hybrid white organic light-emitting diodes (OLEDs). Benefiting from its high emission efficiency and high proportion of horizontally oriented dipoles in the film state, the non-doped deep blue device based on CN-TPB-TPA realized a maximum external quantum efficiency 7.27%, with a low efficiency roll-off and CIE coordinates of (0.15, 0.08). Moreover, efficient two-color hybrid warm white OLEDs (CIE<sub>x,y</sub> = 0.43, 0.45) were achieved using CN-TPB-TPA as the blue-emitting layer and phosphor doped host, which realized maximum current, power, external quantum efficiencies 58.0 cd A<sup>-1</sup>, 60.7 lm W<sup>-1</sup> and 19.1%, respectively. This work provides a general strategy to achieve high performance, stable deep blue and hybrid white OLEDs by construction of AIEgens with excellent horizontal orientation

The critical role of the coordination sphere in the high-efficiency blue-light emission from aminopyrazine metal-organic polymers

2021 ◽  
Vol 186 ◽  
pp. 109025
Author(s):  
João Humberto Dias Campos ◽  
Meiry Edivirges Alvarenga ◽  
Maykon Alves Lemes ◽  
José Antônio do Nascimento Neto ◽  
Freddy Fernandes Guimarães ◽  
...  
Keyword(s):  
Blue Light ◽  
Coordination Sphere ◽  
High Efficiency ◽  
Light Emission ◽  
Critical Role ◽  
Organic Polymers ◽  
Blue Light Emission ◽  
Metal Organic

Improvement of efficiency and its roll-off at high brightness in white organic light-emitting diodes by strategically managing triplet excitons in the emission layer

2018 ◽  
Vol 6 (40) ◽  
pp. 10793-10803 ◽  
Author(s):  
Shian Ying ◽  
Dezhi Yang ◽  
Xianfeng Qiao ◽  
Yanfeng Dai ◽  
Qian Sun ◽  
...  
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Emission Layer ◽  
High Brightness ◽  
Light Emitting ◽  
Organic Light ◽  
Low Efficiency ◽  
Triplet Excitons

High-performance WOLEDs realizing high efficiency and low efficiency roll-off simultaneously were achieved by strategically managing triplet excitons in the emission layer.

The critical role of materials metrology in engineering

1987 ◽  
Vol 322 (1567) ◽  
pp. 361-372
Keyword(s):  
High Performance ◽  
Critical Role ◽  
Test Procedures ◽  
Engineering Structures ◽  
Codes Of Practice ◽  
Materials Research ◽  
Future Technologies ◽  
Industrial Needs ◽  
Industrial Standards

This paper analyses the critical underpinning role of materials research and testing for contemporary engineering and future technologies. It is obvious that measurements, tests and evaluations of materials and components, i.e. materials metrologies, are crucial to provide the information and data needed to optimize the function of engineering structures. The industrial needs and research trends in materials metrology are reviewed, and recent BAM-developments of measuring techniques for high-technology sectors, like high-temperature technology or high-performance ceramics, are presented. Finally, the relevance of an appropriate metrological base for the establishment of industrial standards, agreed codes of practice and the harmonization of test procedures for the international trade of technical products is discussed.

Simultaneous high efficiency/CRI/spectral stability and low efficiency roll-off hybrid white organic light-emitting diodes via simple insertion of ultrathin red/green phosphorescent emitters in a blue exciplex

2020 ◽  
Vol 8 (36) ◽  
pp. 12450-12456 ◽  
Author(s):  
Yuwen Chen ◽  
Yibing Wu ◽  
Chengwei Lin ◽  
Yanfeng Dai ◽  
Qian Sun ◽  
...  
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Spectral Stability ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Low Efficiency

High performance hybrid WOLEDs have been realized by precisely inserting ultrathin red/green phosphorescent layers in a blue exciplex emitter.

Critical role of atomic-scale defect disorders for high-performance nanostructured half-Heusler thermoelectric alloys and their thermal stability

2019 ◽  
Vol 180 ◽  
pp. 97-104 ◽  
Author(s):  
Ho Jae Lee ◽  
Kyu Hyoung Lee ◽  
Liangwei Fu ◽  
GyeongTak Han ◽  
Hyun-Sik Kim ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Performance ◽  
Critical Role ◽  
Atomic Scale

scholarly journals Critical Role of H-Aggregation for High-Efficiency Photoinduced Charge Generation in Pristine Pentamethine Cyanine Salts

2021 ◽  
Author(s):  
George Cameron Fish ◽  
Juan Manuel Moreno-Naranjo ◽  
Andreas Billion ◽  
Daniel Kratzert ◽  
Erwin Hack ◽  
...  
Keyword(s):  
High Efficiency ◽  
Transient Absorption ◽  
Critical Role ◽  
Optoelectronic Devices ◽  
Transient Absorption Spectroscopy ◽  
Organic Photovoltaic ◽  
Charge Generation ◽  
Femtosecond Transient Absorption ◽  
Photoinduced Charge

The mechanism of photoinduced symmetry-breaking charge separation in solid cyanine salts at the base of organic photovoltaic and optoelectronic devices is still debated. Here, we employ femtosecond transient absorption spectroscopy...

scholarly journals Effect of Flow Rate and Filter Efficiency on Indoor PM2.5 in Ventilation and Filtration Control

Atmosphere ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 1061 ◽  
Author(s):  
Ji-Hye Kim ◽  
Myoung-Souk Yeo
Keyword(s):  
Flow Rate ◽  
High Efficiency ◽  
Residential Buildings ◽  
Critical Role ◽  
Particle Model ◽  
Flow Rates ◽  
Filter Efficiency ◽  
Wide Range ◽  
Low Efficiency ◽  
Indoor Pm2.5

Ventilation and filtration control play a critical role in determining indoor PM2.5 (particles less than 2.5 μm in aerodynamic diameter) concentrations of outdoor or indoor origin in residential environments. The objective of this study was to investigate the combined effects of flow rates and filter efficiency on indoor PM2.5 concentrations of residential buildings in Seoul, Korea. Using a particle model based on a mass–balance equation, parametric analysis was performed to examine indoor PM2.5 concentrations according to flow rates and filter efficiency under a wide range of outdoor concentrations and indoor generations. Results showed that ventilation control equipped with a medium–efficiency filter was as effective as that with a high-efficiency filter under normal outdoor concentration and high indoor generation rate conditions. It is not recommended to apply a low-efficiency filter because indoor concentration increases rapidly as outdoor PM2.5 increases when ventilation flow rate is high. For filtration control, it is important to increase both flow rate and filter efficiency in order to improve indoor PM2.5 concentration.

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