Synthesis and Light-Emtting Diodes Properties of Two New Fluorene Based Copolymers

2011 ◽  
Vol 295-297 ◽  
pp. 274-277 ◽  
Author(s):  
Jian Hua Huang ◽  
Xiang Hui Ye ◽  
Chuan Lang Zhan ◽  
Gui Yu ◽  
Yun Qi Liu ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Light Emitting Diodes ◽  
Coupling Reaction ◽  
Suzuki Coupling ◽  
Maximum Brightness ◽  
Suzuki Coupling Reaction ◽  
Light Emitting ◽  
Maximum Current ◽  
Conjugated Copolymers

Two new conjugated copolymers, PFPh and PFTDP, comprised of alternating 9,9-dioctylfluorene and phthalimide (Ph) or thieno [3, 4-c] pyrrole-4,6-dione (TPD) have been synthesized via Suzuki coupling reaction. Polymeric light-emitting diodes (PLED) were fabricated with an ITO/PEDOT: PSS/PVK/Polymer/BCP/Alq/Ca:Ag configuration. The maximum brightness and maximum current efficiency of PLED are 2600cd/m2and 2.52 cd/A for PFPh, and 2300cd/m2and 1.13 cd/A for PFTDP, respectively, which are significantly improved compared with the reported alternating fluorene-unsubstituted phenylene/thiophene systems.

scholarly journals Improved Efficiency of Perovskite Light-Emitting Diodes Using a Three-Step Spin-Coated CH3NH3PbBr3 Emitter and a PEDOT:PSS/MoO3-Ammonia Composite Hole Transport Layer

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 459 ◽  
Author(s):  
Yuanming Zhou ◽  
Sijiong Mei ◽  
Dongwei Sun ◽  
Neng Liu ◽  
Wuxing Shi ◽  
...  
Keyword(s):  
Current Efficiency ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Control Device ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Injection ◽  
Maximum Luminance ◽  
Light Emitting ◽  
Maximum Current

High efficiency perovskite light-emitting diodes (PeLEDs) using PEDOT:PSS/MoO3-ammonia composite hole transport layers (HTLs) with different MoO3-ammonia ratios were prepared and characterized. For PeLEDs with one-step spin-coated CH3NH3PbBr3 emitter, an optimal MoO3-ammonia volume ratio (0.02) in PEDOT:PSS/MoO3-ammonia composite HTL presented a maximum luminance of 1082 cd/m2 and maximum current efficiency of 0.7 cd/A, which are 82% and 94% higher than those of the control device using pure PEDOT:PSS HTL respectively. It can be explained by that the optimized amount of MoO3-ammonia in the composite HTLs cannot only facilitate hole injection into CH3NH3PbBr3 through reducing the contact barrier, but also suppress the exciton quenching at the HTL/CH3NH3PbBr3 interface. Three-step spin coating method was further used to obtain uniform and dense CH3NH3PbBr3 films, which lead to a maximum luminance of 5044 cd/m2 and maximum current efficiency of 3.12 cd/A, showing enhancement of 750% and 767% compared with the control device respectively. The significantly improved efficiency of PeLEDs using three-step spin-coated CH3NH3PbBr3 film and an optimum PEDOT:PSS/MoO3-ammonia composite HTL can be explained by the enhanced carrier recombination through better hole injection and film morphology optimization, as well as the reduced exciton quenching at HTL/CH3NH3PbBr3 interface. These results present a promising strategy for the device engineering of high efficiency PeLEDs.

Strong circularly polarized electroluminescence based on chiral salen-Zn(ii) complex monomer chromophores

2019 ◽  
Vol 3 (5) ◽  
pp. 867-873 ◽  
Author(s):  
Yihan Chen ◽  
Xiaojing Li ◽  
Nengquan Li ◽  
Yiwu Quan ◽  
Yixiang Cheng ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Maximum Brightness ◽  
Light Emitting ◽  
Circularly Polarized ◽  
Organic Light

Circularly polarized organic light-emitting diodes were fabricated by using salen-Zn(ii) complex enantiomers (R-/S-ZnL) as the emitting layer, obtaining 1000 cd m−2, 0.181 cd A−1 and 0.074 lm W−1 for the maximum brightness, current efficiency and power efficiency. With an electroluminescence dissymmetry factor of up to +0.05/−0.05.

Blue Fluorescent Organic Light-Emitting Diodes Using 11,11-Dimethyl-3-(10-phenylanthracen-9-yl)-11H-Indeno[1,2-b]Quinoline Derivatives

2020 ◽  
Vol 20 (8) ◽  
pp. 4652-4656
Author(s):  
Junyoung Moon ◽  
Jinho Lee ◽  
Ki Ju Kim ◽  
Hakjun Lee ◽  
Young Kwan Kim ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Coupling Reaction ◽  
Organic Light Emitting Diodes ◽  
Blue Fluorescence ◽  
Suzuki Coupling Reaction ◽  
Light Emitting ◽  
Organic Light ◽  
20 Nm

In this study, we designed and synthesized two blue fluorescence materials using phenylanthracenesubstituted-indenoquinoline derivatives by Suzuki coupling reaction for organic light-emitting diodes (OLEDs). In order to study their electroluminescent properties, we fabricated the OLED devices using these two materials as emissive layer (EML) with the following sequence: indium-tin-oxide (ITO, 180 nm)/4,4′,4″-tris[2-naphthyl(phenyl)-amino]triphenylamine (2-TNATA, 30 nm)/N,N′-diphenyl-N,N′-(2-napthyl)-(1,1′-phenyl)-4,4′-diamine (NPB, 20 nm)/Blue emitting materials (20 nm)/4,7-Diphenyl-1,10-phenanthroline (Bphen, 30 nm)/lithium quinolate (Liq, 2 nm)/Al (100 nm). In particular, a device using 11,11-dimethyl-3-(10-phenylanthracen-9-yl)-11H-Indeno[1,2-b]quinoline in emitting layer showed luminous efficiency, power efficiency, and external quantum efficiency of 2.18 cd/A, 1.10 lm/W, 2.20% at 20 mA/cm2, respectively, with Commission Internationale d’Énclairage (CIE) coordinates of (0.15, 0.11) at 8.0 V.

Small organic molecules based on oxazole/thiazole with excellent performances in green and red phosphorescent organic light-emitting diodes

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 51575-51582 ◽  
Author(s):  
Guojian Tian ◽  
Xiang Wei ◽  
Ning Xiang ◽  
Jinhai Huang ◽  
Jin Cao ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Organic Molecules ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Small Organic Molecules ◽  
Light Emitting ◽  
Organic Light ◽  
Host Materials ◽  
Maximum Current

Four small organic host materials based on oxazole/thiazole have been synthesized and fully characterized. The best performance of compound 2d was a maximum current efficiency of 50.7 cd A−1 for green device and a maximum current efficiency of 18.7 cd A−1 for red device.

Bis(benzothiophene-S,S-dioxide) fused small molecules realize solution-processible, high-performance and non-doped blue organic light-emitting diodes

2020 ◽  
Vol 8 (3) ◽  
pp. 1002-1009 ◽  
Author(s):  
Liwen Hu ◽  
Siyang Liu ◽  
Guohua Xie ◽  
Wei Yang ◽  
Bin Zhang
Keyword(s):  
Current Efficiency ◽  
Small Molecules ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Polycyclic Aromatics ◽  
Light Emitting ◽  
Organic Light ◽  
Maximum Current

A series of solution-processible blue small molecules based on bis(benzothiophene-S,S-dioxide) fused polycyclic aromatics (FBTO) are synthesized, which show the high EL performance with the maximum current efficiency of 6.37 cd A−1.

Synthesis and Electroluminescent Properties of Fluorene-Based Three-Component Red Light-Emitting Copolymers

2011 ◽  
Vol 197-198 ◽  
pp. 1221-1224
Author(s):  
Qiong Hou ◽  
Dan Dan Ruan ◽  
Lin Tao Hou ◽  
Hong Zhu
Keyword(s):  
Organic Solvents ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Red Light ◽  
Coupling Reaction ◽  
Hole Mobility ◽  
Suzuki Coupling ◽  
Suzuki Coupling Reaction ◽  
Light Emitting ◽  
Palladium Catalyzed

Novel soluble three-component conjugated copolymers are synthesized by palladium- catalyzed Suzuki coupling reaction from 9,9-dioctylfluorene (DOF), 9-ethylhexylcarbazole (Cz) and 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DBT) with Cz composition varying from 1-15 mol% in the copolymer. All of the polymers are soluble in common organic solvents and are highly photoluminescent. The electrochemical, optical, photoluminescent (PL) and electroluminescent (EL) properties of the copolymers were studied. When the hole transmitting material carbazole is introduced into the copolymer PFO-DBT, the hole mobility of the luminescent layer material is improved. The three-component copolymers compared with copolymer PFO-DBT15, Devices made up of these copolymers still emit saturated red light. The highest external quantum efficiency achieved in the device configuration ITO/PEDT/PFO-Cz-DBT15/Ba/Al is 1.81% for the copolymer for 10% Cz content, higher than that of the device made from PFO-DBT15.

scholarly journals Efficient green electroluminescence based on an iridium(iii) complex with different device structures

RSC Advances ◽  
2017 ◽  
Vol 7 (5) ◽  
pp. 2615-2620 ◽  
Author(s):  
Yi-Ming Jing ◽  
You-Xuan Zheng ◽  
Jing-Lin Zuo
Keyword(s):  
Current Efficiency ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Iridium Complex ◽  
Device Structure ◽  
Light Emitting ◽  
Organic Light ◽  
Device Structures ◽  
Maximum Current

Organic light-emitting diodes based on an iridium complex using different device structure show high performances with a maximum current efficiency of 86.5 cd A−1and a maximum power efficiency of 52.2 lm W−1, respectively.

Doped hole injection bilayers for solution processable blue phosphorescent organic light-emitting diodes

2016 ◽  
Vol 4 (27) ◽  
pp. 6570-6574 ◽  
Author(s):  
Bo Wang ◽  
Lei Zhang ◽  
Yun Hu ◽  
Xiao-Bo Shi ◽  
Zhao-Kui Wang ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Hole Injection ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light ◽  
Maximum Current ◽  
Solution Processable ◽  
Blue Phosphorescent

A hole injection bilayer was developed for solution processed blue phosphorescent OLEDs with a maximum current efficiency of 16.7 cd A−1.

Efficient quasi-two dimensional perovskite light-emitting diodes using a cage-type additive

2020 ◽  
Vol 8 (29) ◽  
pp. 9845-9853
Author(s):  
Run Wang ◽  
Yue Zhang ◽  
Xing-Juan Ma ◽  
Yan-Hong Deng ◽  
Jun-Wei Shi ◽  
...  
Keyword(s):  
Current Efficiency ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Hole Transport ◽  
Type Structure ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Two Dimensional ◽  
Light Emitting ◽  
Maximum Current

High performance quasi-2D PeLEDs with maximum current efficiency of 35.5 cd A−1, by introducing α-cyclodextrin (α-CD) with a cage-type structure as an additive and TFB/PVK bilayer as a hole transport layer, are demonstrated.

Preparation and characterization of glycopolymers with biphenyl spacers via Suzuki coupling reaction

2021 ◽  
Author(s):  
Hirokazu Seto ◽  
Takumi Tono ◽  
Akiko Nagaoka ◽  
Mai Yamamoto ◽  
Yumiko Hirohashi ◽  
...  
Keyword(s):  
Coupling Reaction ◽  
Suzuki Coupling ◽  
Side Chains ◽  
Suzuki Coupling Reaction ◽  
Reactant Concentration

Poly(vinylbiphenyl)s bearing glycoside ligands at the side chains were prepared using the Suzuku coupling reaction. Effects of glycoside reactant concentration, halide species, glycoside species, and catalyst species on the incorporation...

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