Synthesis and Structure - Property Relationships of Symmetric Ambipolar Quaterfluorene-Containing Oxadiazole as a Central Core and Diphenylamine as End-capping Moieties

2008 ◽  
Vol 61 (7) ◽  
pp. 541 ◽  
Author(s):  
Fan Yang ◽  
Xiao Ling Zhang ◽  
Mo Jun Xiong ◽  
Zi Jian Cao ◽  
Ping Fang Xia ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Single Layer ◽  
Cross Coupling ◽  
Structure Property ◽  
Electrochemical Stabilities ◽  
Light Emitting ◽  
Structure Property Relationships ◽  
Hole Transporting ◽  
End Capping ◽  
Double Charge

A facile approach for the synthesis of the symmetric ambipolar quaterfluorene, OF(4)OX-NPh, with hole-transporting and electron-transporting moieties by Suzuki cross-coupling as a key reaction has been developed. This novel ambipolar quaterfluorene exhibits high thermal and electrochemical stabilities and is expected to possess potential application as a double charge-transfer and light-emitting material in the field of single-layer organic emitting diodes.

Catalyst Halogenation Enables Rapid and Efficient Polymerizations with Visible to Near-Infrared Light

2020 ◽  
Author(s):  
Alex Stafford ◽  
Dowon Ahn ◽  
Emily Raulerson ◽  
Kun-You Chung ◽  
Kaihong Sun ◽  
...  
Keyword(s):  
Near Infrared ◽  
Transient Absorption ◽  
Reaction Times ◽  
Infrared Light ◽  
Structure Property ◽  
Light Emitting ◽  
Structure Property Relationships ◽  
Nir Light ◽  
Light Intensities ◽  
Emission Quenching

Driving rapid polymerizations with visible to near-infrared (NIR) light will enable nascent technologies in the emerging fields of bio- and composite-printing. However, current photopolymerization strategies are limited by long reaction times, high light intensities, and/or large catalyst loadings. Improving efficiency remains elusive without a comprehensive, mechanistic evaluation of photocatalysis to better understand how composition relates to polymerization metrics. With this objective in mind, a series of methine- and aza-bridged boron dipyrromethene (BODIPY) derivatives were synthesized and systematically characterized to elucidate key structure-property relationships that facilitate efficient photopolymerization driven by visible to NIR light. For both BODIPY scaffolds, halogenation was shown as a general method to increase polymerization rate, quantitatively characterized using a custom real-time infrared spectroscopy setup. Furthermore, a combination of steady-state emission quenching experiments, electronic structure calculations, and ultrafast transient absorption revealed that efficient intersystem crossing to the lowest excited triplet state upon halogenation was a key mechanistic step to achieving rapid photopolymerization reactions. Unprecedented polymerization rates were achieved with extremely low light intensities (< 1 mW/cm<sup>2</sup>) and catalyst loadings (< 50 μM), exemplified by reaction completion within 60 seconds of irradiation using green, red, and NIR light-emitting diodes.

Highly efficient single-layer blue polymer light-emitting diodes based on hole-transporting group substituted poly(fluorene-co-dibenzothiophene-S,S-dioxide)

2017 ◽  
Vol 5 (37) ◽  
pp. 9680-9686 ◽  
Author(s):  
Feng Peng ◽  
Na Li ◽  
Lei Ying ◽  
Wenkai Zhong ◽  
Ting Guo ◽  
...  
Keyword(s):  
Blue Light ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Single Layer ◽  
Random Copolymer ◽  
Hole Transport ◽  
Light Emitting ◽  
Hole Transporting ◽  
Polymer Light Emitting Diodes ◽  
Copolymer Poly

We developed a series of high-performance blue light-emitting polymers that contain hole-transport moieties comprising carbazole or triphenylamine substituents in the side chains of random copolymer poly(fluorene-co-dibenzothiophene-S,S-dioxide) (PFSO).

Patterning Scheme Based on Photoacid Induced Spectral Changes for Single Layer, Patterned Full Color Light Emitting Diodes

2006 ◽  
Vol 965 ◽  
Author(s):  
Maria Vasilopoulou ◽  
Giorgos Pistolis ◽  
Athanasios Botsialas ◽  
Nikos Stathopoulos ◽  
Maria Rangoussi ◽  
...  
Keyword(s):  
Single Layer ◽  
Spectral Shift ◽  
Blue Color ◽  
Light Emitting ◽  
Photoacid Generators ◽  
Onium Salts ◽  
Hole Transporting ◽  
Polymeric Layer ◽  
Different Color ◽  
Definition Of

ABSTRACTPhotochemically induced emission tuning (PIET) for the definition of different color emitting areas in a single conducting polymeric layer is demonstrated. The commercially available poly(9-vinylcarbazole) (PVK), well known as a hole transporting layer in OLEDs technology, was used. The three primary colors emitting areas in a single layer of PVK film were defined using a suitable green emitter 1-[4-(dimethylamino)phenyl]-6-phenylhexa-1,3,5,-triene (DMA-DPH) along with the red emitter (4-dimethylamino-4'-nitrostilbene) (DANS). The selected emitters were dispersed in the PVK films in the presence of a photoacid generator (PAG). Various onium salts were tested as photoacid generators in order to select those, which could cause effectivily the photoinduced protonation and emission tuning of the probes molecules. Through proton induced bleaching of the red emitter and proton induced spectral shift of the green one, the definition of all three primary color emitting areas was possible. In this way the unexposed areas of the film remain red, the areas exposed with the intermediate dose become green and the fully exposed areas emit blue color. Intermediate colors and white light can also be obtained.

Tb-containing electroluminescent polymer with both electron- and hole-transporting side groups for single layer light emitting diodes

2004 ◽  
Vol 144 (3) ◽  
pp. 259-263 ◽  
Author(s):  
Lichang Zeng ◽  
Mujie Yang ◽  
Peng Wu ◽  
Hui Ye ◽  
Xu Liu
Keyword(s):  
Light Emitting Diodes ◽  
Single Layer ◽  
Light Emitting ◽  
Hole Transporting

Covalent Functionalized Conjugated Dendrimers for Organic Light Emitting Diodes: Synthesis, Characterization, and the Deep Blue Electroluminescence

2011 ◽  
Vol 64 (2) ◽  
pp. 160 ◽  
Author(s):  
Yan Zhou ◽  
Lin Ding ◽  
Li-Ming Xiang ◽  
Jian Pei
Keyword(s):  
Light Emitting Diode ◽  
Photophysical Properties ◽  
Single Layer ◽  
Blue Colour ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Deep Blue ◽  
Organic Light ◽  
Hole Transporting ◽  
Cie Chromaticity

Two deep blue-emitting dendrimers 11 and 12 with carbazole containing dendrons were developed in this contribution. The carbazole-containing units were introduced to tune the charge-transporting property of the desired dendrimers. The investigation of photophysical properties, electrochemical, and electroluminescence properties demonstrated that the balance between electron and hole transporting was achieved from both dendrimers. The preliminary organic light-emitting diode (OLED) fabrication achieved a pure blue colour with stable CIE chromaticity coordinates (X: 0.15–0.16, Y: 0.09–0.10) for 11 and 12. Single layer deep blue emitting diode devices with higher efficiency are achieved without the colour changing. The investigation of OLED performance indicates that dendrimers 11 and 12 are promising light-emitting materials with pure blue colour and good colour stability for OLEDs.

scholarly journals Improved efficiency in organic solar cells via conjugated polyelectrolyte additive in the hole transporting layer

2016 ◽  
Vol 4 (45) ◽  
pp. 10722-10730 ◽  
Author(s):  
Chan Kyu Kwak ◽  
Gabriel E. Pérez ◽  
Benjamin G. Freestone ◽  
Sulaiman A. Al-Isaee ◽  
Ahmed Iraqi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Power Conversion Efficiency ◽  
Organic Solar Cells ◽  
Power Conversion ◽  
Cross Coupling ◽  
Water Soluble ◽  
Conjugated Polyelectrolyte ◽  
Hole Charge ◽  
Hole Transporting

The water soluble conjugated polyelectrolyte was synthesised by Suzuki cross coupling and increased the power conversion efficiency by improving hole charge transfer from active layer into the hole transporting layer.

Solution-processable, single-layer, blue organic light-emitting diodes employing dual emitting cores of hybridized local and charge-transfer units

2016 ◽  
Vol 132 ◽  
pp. 94-102 ◽  
Author(s):  
Yongqi Bai ◽  
Ling Hong ◽  
Tao Lei ◽  
Lei Zhang ◽  
Xinhua Ouyang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Light Emitting Diodes ◽  
Single Layer ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Solution Processable

Structure−Property Relationships in Light-Emitting Polymers:  Optical, Electrochemical, and Thermal Studies

2000 ◽  
Vol 33 (20) ◽  
pp. 7426-7430 ◽  
Author(s):  
Min Zheng ◽  
Ananda M. Sarker ◽  
E. Elif Gürel ◽  
Paul M. Lahti ◽  
Frank E. Karasz
Keyword(s):  
Thermal Studies ◽  
Structure Property ◽  
Light Emitting ◽  
Structure Property Relationships
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