scholarly journals Organic Light-Emitting Diodes Using Octafluorobiphenyl-Based Polymer Synthesized by Direct C－H/C－H Cross Coupling Reaction

2018 ◽  
Vol 31 (3) ◽  
pp. 323-327
Author(s):  
Takeshi Yasuda ◽  
Hideaki Aoki ◽  
Junpei Kuwabara ◽  
Takaki Kanbara
Keyword(s):  
Light Emitting Diodes ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Cross Coupling Reaction

TOWARD EFFICIENT ELECTRON-TRANSPORTING AND BLUE-EMITTING MATERIALS FOR ORGANIC LIGHT-EMITTING DIODES: STRUCTURE AND PHOTOLUMINESCENT PROPERTIES OF SILOLE DERIVATIVES

2005 ◽  
Vol 14 (04) ◽  
pp. 487-495 ◽  
Author(s):  
YOUNGJIN KANG ◽  
JUNGCHEOL PARK ◽  
JUN HEO ◽  
KI-MIN PARK ◽  
JUN-HWAN AHN ◽  
...  
Keyword(s):  
Reduction Potential ◽  
Energy Levels ◽  
Coupling Reaction ◽  
Organic Light Emitting Diodes ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
X Ray ◽  
Cyclic Voltametry ◽  
Organic Light ◽  
Cross Coupling Reaction

The potential blue-emitting as well as electron-transporting materials, 2,5-bis(3,5-trifluoromethylphenyl)-1,1-dimethyl-3,4-diphenylsilole (silole = silacyclopentadiene) (1) and 2,5-bis(3,5-trifluoromethylphenyl)-1,1-diphenyl-3,4-diphenylsilole (2), were synthesized by the Pd-mediated cross coupling reaction of corresponding bis(pheny-lethynyl)silanes with 1-bromo-3,5-trifluoromethylbenzene via intramolecular reductive cyclization. The structure of 2 was established by single-crystal X-ray diffraction analysis. In crystal structure, the dihedral angle between the functionalized phenyl groups containing CF3 at 2,5-position and central silole ring is about 48.70(6)°, showing the diminution of effective conjugation. These compounds exhibited high thermal stability without degradation up to 200°C. The absorption and photoluminescent properties, and cyclic voltametry have been evaluated. Compounds 1 and 2 in thin films showed intense blue emissions at 464–473 nm, respectively, in photoluminescence (PL). In electrochemistry, the reduction potential of 1 and 2 were at -1.92 and -1.81 V, respectively. The presence of substituents at 2,5′ — and/or 1,1′ — positions of siloe ring affected the LUMO energy levels through σ*–π* conjugation.

1,3,4-Oxadiazoles as luminescent materials for organic light emitting diodes via cross-coupling reactions

2016 ◽  
Vol 4 (37) ◽  
pp. 8596-8610 ◽  
Author(s):  
A. Paun ◽  
N. D. Hadade ◽  
C. C. Paraschivescu ◽  
M. Matache
Keyword(s):  
Light Emitting Diodes ◽  
Cross Coupling ◽  
Literature Survey ◽  
Organic Light Emitting Diodes ◽  
Luminescent Materials ◽  
Coupling Reactions ◽  
Light Emitting ◽  
Cross Coupling Reactions ◽  
Organic Light ◽  
The Cross

A literature survey of the cross-coupling reactions in the preparation of 1,3,4-oxadiazole compounds as useful materials for OLEDs is described.

Fluorinated anthracene derivatives as deep-blue emitters and host materials for highly efficient organic light-emitting devices

RSC Advances ◽  
2015 ◽  
Vol 5 (73) ◽  
pp. 59027-59036 ◽  
Author(s):  
Lu Li ◽  
Bo Jiao ◽  
Yue Yu ◽  
Lin Ma ◽  
Xun Hou ◽  
...  
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Deep Blue ◽  
Organic Light ◽  
Cross Coupling Reaction ◽  
Host Materials ◽  
Anthracene Derivatives ◽  
Blue Emitters

Novel fluorinated anthracene based deep-blue-emitting molecules, namely 9,10-bis-(n′-fluoro-biphenyl-3-yl)-anthracene (nF-DPAs), have been designed and synthesized by a Suzuki cross-coupling reaction.

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.

scholarly journals Acridine-Triphenylamine Based Hole-Transporting and Hole-Injecting Material for Highly Efficient Phosphorescent-Based Organic Light Emitting Diodes

2018 ◽  
Vol 8 (7) ◽  
pp. 1168 ◽  
Author(s):  
Ramanaskanda Braveenth ◽  
Il-Ji Bae ◽  
Yan Wang ◽  
Soo Kim ◽  
Miyoung Kim ◽  
...  
Keyword(s):  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Coupling Reaction ◽  
Single Step ◽  
Organic Light Emitting Diodes ◽  
Hole Injection ◽  
Excellent Thermal Stability ◽  
Light Emitting ◽  
Organic Light ◽  
Hole Transporting

In this study, triphenylamine-based hole-transporting material 4-(9,9-diphenylacridin-10(9H)-yl)-N-(4-(9,9-diphenylacridin-10(9H)-yl) phenyl)-N-phenylaniline (TPA-1A) was designed and synthesized by using single-step Buchwald–Hartwig coupling reaction with higher yield percentage of 76%. Our synthesized TPA-1A showed excellent thermal stability, with a higher glass transition temperature of 176 °C and decomposition temperature of 474 °C at 5% weight reduction. TPA-1A based green phosphorescent organic light emitting diodes (PhOLED) device was fabricated to investigate the device properties and compare it with the similar reference N,N′-Di(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine (NPB)based device. The TPA-1A-based PhOLED demonstrated an excellent current and power efficiency of 49.13 cd/A and 27.56 lm/W, respectively. Moreover, TPA-1A demonstrated better hole injection efficiencies as well. The overall efficiencies were better than the reference NPB-based device.

Regioisomer effects of dibenzofuran-based bipolar host materials on yellow phosphorescent OLED device performance

2020 ◽  
Vol 44 (10) ◽  
pp. 3868-3873
Author(s):  
Nam Hee Cho ◽  
Jun Yeob Lee ◽  
Oh Young Kim ◽  
Seok-Ho Hwang
Keyword(s):  
Light Emitting Diodes ◽  
Cross Coupling ◽  
Organic Light Emitting Diodes ◽  
Device Performance ◽  
Coupling Reactions ◽  
Oled Device ◽  
Light Emitting ◽  
Cross Coupling Reactions ◽  
Organic Light ◽  
Host Materials

Four regioisomers were synthesized for use as bipolar host materials for phosphorescent organic light-emitting diodes (PhOLEDs) by classic cross-coupling reactions using cyanofluorene and fused dibenzofuran and were readily purified.

Synthesis of conjugated, hyperbranched copolymers for tunable multicolor emissions in light-emitting diodes

2015 ◽  
Vol 6 (28) ◽  
pp. 5062-5069 ◽  
Author(s):  
Jongho Kim ◽  
Juhyeon Park ◽  
Sung-Ho Jin ◽  
Taek Seung Lee
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Light Emitting ◽  
Cross Coupling Reaction

A series of conjugated hyperbranched copolymers (HBPs) based on benzothiadiazole derivatives were synthesized via a Suzuki cross-coupling reaction and their white-light emitting properties were explored.

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