scholarly journals Constructing Donor-Resonance-Donor Molecules for Acceptor-Free Bipolar Organic Semiconductors

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
He Jiang ◽  
Jibiao Jin ◽  
Zijie Wang ◽  
Wuji Wang ◽  
Runfeng Chen ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
High Performance ◽  
Molecular Design ◽  
Stimuli Responsive ◽  
Light Emitting ◽  
Deep Blue ◽  
Device Structures ◽  
Device Applications ◽  
Donor Acceptor ◽  
Organic Optoelectronic

Organic semiconductors with bipolar transporting character are highly attractive as they offer the possibility to achieve high optoelectronic performance in simple device structures. However, the continual efforts in preparing bipolar materials are focusing on donor-acceptor (D-A) architectures by introducing both electron-donating and electron-withdrawing units into one molecule in static molecular design principles. Here, we report a dynamic approach to construct bipolar materials using only electron-donating carbazoles connected by N-P=X resonance linkages in a donor-resonance-donor (D-r-D) structure. By facilitating the stimuli-responsive resonance variation, these D-r-D molecules exhibit extraordinary bipolar properties by positively charging one donor of carbazole in enantiotropic N+=P-X- canonical forms for electron transport without the involvement of any acceptors. With thus realized efficient and balanced charge transport, blue and deep-blue phosphorescent organic light emitting diodes hosted by these D-r-D molecules show high external quantum efficiencies up to 16.2% and 18.3% in vacuum-deposited and spin-coated devices, respectively. These results via the D-r-D molecular design strategy represent an important concept advance in constructing bipolar organic optoelectronic semiconductors dynamically for high-performance device applications.

Strategies for the Molecular Design of Donor–Acceptor-type Fluorescent Emitters for Efficient Deep Blue Organic Light Emitting Diodes

2018 ◽  
Vol 30 (3) ◽  
pp. 857-863 ◽  
Author(s):  
Seung-Je Woo ◽  
Youheon Kim ◽  
Myeong-Jong Kim ◽  
Jang Yeol Baek ◽  
Soon-Ki Kwon ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Molecular Design ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Deep Blue ◽  
Organic Light ◽  
Donor Acceptor

High-performance amorphous organic semiconductor-based vertical field-effect transistors and light-emitting transistors

Nanoscale ◽  
2020 ◽  
Vol 12 (35) ◽  
pp. 18371-18378 ◽  
Author(s):  
Haikuo Gao ◽  
Jinyu Liu ◽  
Zhengsheng Qin ◽  
Tianyu Wang ◽  
Can Gao ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Field Effect ◽  
High Performance ◽  
Field Effect Transistors ◽  
Optoelectronic Devices ◽  
Light Emitting ◽  
Vertical Field ◽  
Organic Optoelectronic Devices ◽  
Organic Optoelectronic ◽  
Vertical Field Effect

Two kinds of vertical organic optoelectronic devices were constructed based on amorphous organic semiconductors and high device performances were achieved.

Non-doped deep blue emitters based on twisted phenanthroimidazole derivatives for organic light-emitting devices (CIE y ≈ 0.04)

2017 ◽  
Vol 41 (12) ◽  
pp. 5191-5197 ◽  
Author(s):  
Guang Li ◽  
Juewen Zhao ◽  
Dan Zhang ◽  
Jieji Zhu ◽  
Zhichun Shi ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Molecular Design ◽  
Design Strategy ◽  
Color Purity ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Deep Blue ◽  
Organic Light ◽  
Donor Acceptor ◽  
Blue Emitters

Three blue emitters via twisted donor–acceptor molecular design strategy show extremely good color purity without impairing the excellent photophysical and electrical properties. The color purity of nondoped devices can meet the blue OLED requirements of NTSC.

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

scholarly journals Shape memory polymer network with thermally distinct elasticity and plasticity

2016 ◽  
Vol 2 (1) ◽  
pp. e1501297 ◽  
Author(s):  
Qian Zhao ◽  
Weike Zou ◽  
Yingwu Luo ◽  
Tao Xie
Keyword(s):  
Shape Memory ◽  
Molecular Design ◽  
Shape Change ◽  
Shape Memory Polymer ◽  
Polymer Network ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Device Applications ◽  
Temperature Ranges ◽  
Rational Molecular Design

Stimuli-responsive materials with sophisticated yet controllable shape-changing behaviors are highly desirable for real-world device applications. Among various shape-changing materials, the elastic nature of shape memory polymers allows fixation of temporary shapes that can recover on demand, whereas polymers with exchangeable bonds can undergo permanent shape change via plasticity. We integrate the elasticity and plasticity into a single polymer network. Rational molecular design allows these two opposite behaviors to be realized at different temperature ranges without any overlap. By exploring the cumulative nature of the plasticity, we demonstrate easy manipulation of highly complex shapes that is otherwise extremely challenging. The dynamic shape-changing behavior paves a new way for fabricating geometrically complex multifunctional devices.

Molecular Tetrominoes: Selective Masking of Donor pi-face to Control Configuration of Donor-Acceptor Complex

2021 ◽  
Author(s):  
Jenna L Sartucci ◽  
Arindam Maity ◽  
Manikandan Mohanan ◽  
Jeffery A. Bertke ◽  
Miklos Kertesz ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Organic Electronics ◽  
Molecular Design ◽  
Design Rules ◽  
Acceptor Complex ◽  
Donor Acceptor ◽  
Doping Mechanism ◽  
Control Configuration

Understanding the doping mechanism in organic semiconductors and generating molecular design rules to control the doping process is crucial to improve the performance of organic electronics. Even though controlling the...

Highly efficient deep-blue light-emitting material based on V-Shaped donor-acceptor triphenylamine-phenanthro[9,10-d]imidazole molecule

2020 ◽  
Vol 180 ◽  
pp. 108511
Author(s):  
Yue Yu ◽  
Ruiyang Zhao ◽  
Haichao Liu ◽  
Shitong Zhang ◽  
Changjiang Zhou ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emitting ◽  
Highly Efficient ◽  
Deep Blue ◽  
Donor Acceptor
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