Tetraphenyl ornamented carbazolyl disubstituted diphenyl sulfone as bipolar TADF host for highly efficient OLEDs with low efficiency roll-offs

2021 ◽  
pp. 109573
Author(s):  
Dalius Gudeika ◽  
Oleksandr Bezvikonnyi ◽  
Naveen Masimukku ◽  
Dmytro Volyniuk ◽  
Chia-Hsun Chen ◽  
...  
Keyword(s):  
Highly Efficient ◽  
Diphenyl Sulfone ◽  
Low Efficiency

Efficient organic light-emitting diodes based on iridium(III) complexes containing indolo[3,2,1-jk]carbazole derivatives with narrow emission bandwidths and low efficiency roll offs

2021 ◽  
Author(s):  
Xiang-Ji Liao ◽  
Jin-Jun Zhu ◽  
Li Yuan ◽  
Zhi-Ping Yan ◽  
Xu-Feng Luo ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Carbazole Derivatives ◽  
Highly Efficient ◽  
Organic Light ◽  
Low Efficiency ◽  
Narrow Emission

In this work, two cyclometalated ligands 2-(pyridin-2-yl)indolo[3,2,1-jk]carbazole (pyidcz) and 2-(4-(trifluoromethyl)pyridin-2-yl)indolo[3,2,1-jk]carbazole (tfpyidcz) using indolo[3,2,1-jk]carbazole unit were synthesized for highly efficient iridium(III) complexes (pyidcz)2Ir(tmd) and (tfpyidcz)2Ir(tmd) (tmd = 2,2,6,6-tetramethyl-3,5-heptanedione). The two Ir(III)...

Highly efficient orange-red electroluminescence of iridium complexes with good electron mobility

2017 ◽  
Vol 5 (32) ◽  
pp. 8150-8159 ◽  
Author(s):  
Hua-Bo Han ◽  
Rong-Zhen Cui ◽  
Yi-Ming Jing ◽  
Guang-Zhao Lu ◽  
You-Xuan Zheng ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Electron Mobility ◽  
Quantum Yields ◽  
Iridium Complexes ◽  
Maximum Luminance ◽  
High Quantum ◽  
Highly Efficient ◽  
Maximum Current ◽  
Low Efficiency

Two orange-red iridium complexes with high quantum yields and good electron mobility were applied in efficient OLEDs showing a maximum luminance of 129 466 cd m−2, a maximum current efficiency of 62.96 cd A−1 with low efficiency roll-off.

scholarly journals Highly Efficient and Low-Temperature Preparation of Plate-Like ZrB2-SiC Powders by a Molten-Salt and Microwave-Modified Boro/Carbothermal Reduction Method

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1811 ◽  
Author(s):  
Yuan Zeng ◽  
Feng Liang ◽  
Jianghao Liu ◽  
Jun Zhang ◽  
Haijun Zhang ◽  
...  
Keyword(s):  
Molten Salt ◽  
Carbothermal Reduction ◽  
Reduction Method ◽  
Low Cost ◽  
Highly Efficient ◽  
Carbothermal Reduction Method ◽  
Low Temperature Preparation ◽  
Phase Pure ◽  
Low Efficiency ◽  
Reduced Temperature

To address the various shortcomings of a high material cost, energy-intensive temperature conditions and ultra-low efficiency of the conventional boro/carbothermal reduction method for the industrial preparation of ZrB2-SiC powders, a novel molten-salt and microwave-modified boro/carbothermal reduction method (MSM-BCTR) was developed to synthesize ZrB2-SiC powders. As a result, phase pure ZrB2-SiC powders can be obtained by firing low-cost zircon (ZrSiO4), amorphous carbon (C), and boron carbide (B4C) at a reduced temperature of 1200 °C for only 20 min. Such processing conditions are remarkably milder than not only that required for conventional boro/carbothermal reduction method to prepare phase pure ZrB2 or ZrB2-SiC powders (firing temperature of above 1500 °C and dwelling time of at least several hours), but also that even with costly active metals (e.g., Mg and Al). More importantly, the as-obtained ZrB2 particles had a single crystalline nature and well-defined plate-like morphology, which is believed to be favorable for enhancing the mechanical properties, especially toughness of their bulk counterpart. The achievement of a highly-efficient preparation of such high-quality ZrB2-SiC powders at a reduced temperature should be mainly attributed to the specific molten-salt and microwave-modified boro/carbothermal reduction method.

scholarly journals Highly efficient non-doped blue fluorescent OLEDs with low efficiency roll-off based on hybridized local and charge transfer excited state emitters

2020 ◽  
Vol 11 (19) ◽  
pp. 5058-5065 ◽  
Author(s):  
Xianhao Lv ◽  
Mizhen Sun ◽  
Lei Xu ◽  
Runzhe Wang ◽  
Huayi Zhou ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Highly Efficient ◽  
Low Efficiency

A new pure fluorescent blue HLCT-emitter was designed and synthesized. Highly efficient non-doped blue OLEDs with low efficiency roll-off were achieved.

Multifunctional emitters for efficient simplified non-doped blueish green organic light emitting devices with extremely low efficiency roll-off

2017 ◽  
Vol 5 (26) ◽  
pp. 6527-6536 ◽  
Author(s):  
Amjad Islam ◽  
Dongdong Zhang ◽  
Xinhua Ouyang ◽  
Rongjuan Yang ◽  
Tao Lei ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Scientific Research ◽  
Industrial Applications ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Highly Efficient ◽  
Organic Light ◽  
Device Structures ◽  
Low Efficiency

Highly efficient organic light-emitting diodes (OLEDs) with simplified device structures are widely desired for both scientific research and industrial applications.

Construction and function of a highly efficient supramolecular luminescent system

2017 ◽  
Vol 196 ◽  
pp. 219-229 ◽  
Author(s):  
Yingjie Liu ◽  
Suqian Ma ◽  
Bin Xu ◽  
Wenjing Tian
Keyword(s):  
Self Assembly ◽  
Photophysical Properties ◽  
Green Emission ◽  
Yellow Emission ◽  
Highly Efficient ◽  
System P ◽  
Low Efficiency ◽  
Assembly Behavior ◽  
And Function ◽  
Stacking Structure

Aggregation-induced emission (AIE) provides a new way of achieving highly efficient luminescent materials. In this contribution, the self-assembly behavior, molecular stacking structure and photophysical properties of two polymorphs of a supramolecular co-crystal (C1 and C2) are investigated. The block-like crystal C1, packed in segregated stacking with strong π–π interactions between the H and G molecules, shows weak green emission with a low efficiency (ΦF) of 2%. In comparison, the needle-like crystal C2, packed in segregated stacking with no obviously strong intermolecular interactions, shows bright yellow emission. More importantly, C1 exhibits mechanochromic behavior.

Structural Effect of Phenylcarbazole-based Molecules on the Exciplex-Forming Co-Host System to Achieve Highly Efficient Phosphorescent OLEDs with Low Efficiency Roll-off

2021 ◽  
Author(s):  
Chih-Chien Lee ◽  
Nurul Ridho Al Amin ◽  
Jing-Jie Xu ◽  
Bo-Cheng Wang ◽  
Dian Luo ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Structural Effect ◽  
Functional Theory ◽  
Host System ◽  
Highly Efficient ◽  
Low Efficiency

In this work, five phenylcarbazole-based molecules (PhCzs), i.e., PhCzp-Me, PhCzm-Me, PhCNCzp-Me, PhCNCzp-MeCzPh, and PhCNCzm-MeCzPh, were synthesized by linking two phenylcarbazole moieties with m-xylene or p-xylene as π-linker. Density functional theory...

Combinatorial donor engineering for highly efficient blue thermally activated delayed fluorescence emitters with low efficiency roll-off

2021 ◽  
Author(s):  
Dong Jin Shin ◽  
Jun Seop Lim ◽  
Jun Yeob Lee
Keyword(s):  
Quantum Yield ◽  
Delayed Fluorescence ◽  
Intersystem Crossing ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Photoluminescence Quantum Yield ◽  
Low Efficiency

A thermally activated delayed fluorescence (TADF) molecule with high reverse intersystem crossing rate accompanied by high photoluminescence quantum yield was developed by combinatorial donor engineering of bicarbazole and 12H-benzofuro[3,2-a]carbazole. The...

Sign in / Sign up

Export Citation Format

Share Document