scholarly journals Limitations of conjugated polymers as emitters in triplet-triplet annihilation upconversion

2021 ◽  
Author(s):  
Riley O'shea ◽  
Can Gao ◽  
Siobhan Bradley ◽  
Tze Cin Owyong ◽  
Na Wu ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Building Blocks ◽  
Phenylene Vinylene ◽  
Triplet Triplet Annihilation

A series of poly(phenylene-vinylene)s (PPV) was synthesized with two monomer building blocks containing methoxy and 2-ethylhexyloxy (MEH) sidechains and sterically bulky fluorenyloxy sidechain. Variations in monomer incorporation were achieved by...

Frequency Resolved Photoluminescence (PL), Delayed Fluorescence and Triplet-Triplet Annihilation In 7Φ-Conjugated Polymers

1999 ◽  
Vol 561 ◽  
Author(s):  
J. Partee ◽  
E. L. Frankevich ◽  
B. Uhlhom ◽  
J. Shinar ◽  
Y. Ding ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Strong Evidence ◽  
Delayed Fluorescence ◽  
Phenylene Vinylene ◽  
Total Emission ◽  
Phenylene Ethynylene ◽  
Frozen Solutions ◽  
Triplet Triplet Annihilation

ABSTRACTThe delayed fluorescence of poly(p-phenylene vinylene) (PPV) and poly(p-phenylene ethynylene) (PPE) derivative solids and frozen solutions at 20 K is described. It provides strong evidence for triplet-triplet annihilation to singlets excitons accounting for up to ∼3% of the total emission in PPV films and ∼1.5% in PPE powder. It also yields triplet lifetimes of 70 and 110 μs in PPV films and frozen solutions, and ∼200 and ∼500 μs in PPE powder and frozen solutions, respectively.

scholarly journals The performance of conjugated polymers as emitters for triplet–triplet annihilation upconversion

2021 ◽  
Author(s):  
Riley O’Shea ◽  
Can Gao ◽  
Tze Cin Owyong ◽  
Jonathan M. White ◽  
Wallace W. H. Wong
Keyword(s):  
Conjugated Polymers ◽  
Phenylene Vinylene ◽  
Phenylene Ethynylene ◽  
Triplet Triplet Annihilation

Phenylene–ethynylene–anthracene copolymer was used as the emitter in triplet–triplet annihilation upconversion outperforming well-known poly(phenylene–vinylene)s.

scholarly journals Revealing the influence of steric bulk on the triplet–triplet annihilation upconversion performance of conjugated polymers

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Riley O’shea ◽  
William J. Kendrick ◽  
Can Gao ◽  
Tze Cin Owyong ◽  
Jonathan M. White ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Conjugated Polymers ◽  
Transfer Process ◽  
Energy Transfer Process ◽  
Phenylene Vinylene ◽  
Phosphorescence Quenching ◽  
Photoluminescence Quantum Yield ◽  
Triplet Triplet Annihilation

AbstractA series of poly(phenylene-vinylene)-based copolymers are synthesized using the Gilch method incorporating monomers with sterically bulky sidechains. The photochemical upconversion performance of these polymers as emitters are investigated using a palladium tetraphenyltetrabenzoporphyrin triplet sensitizer and MEH-PPV as reference. Increased incorporation of sterically bulky monomers leads to a reduction in the upconversion efficiency despite improved photoluminescence quantum yield. A phosphorescence quenching study indicates issues with the energy transfer process between the triplet sensitizer and the copolymers. The best performance with 0.18% upconversion quantum yield is obtained for the copolymer containing 10% monomer with bulky sidechains.

Frequency Resolved Photoluminescence (PL), Delayed Fluorescence and Triplet-Triplet Annihilation in Φ-Conjugated Polymers

1999 ◽  
Vol 558 ◽  
Author(s):  
J. Partee ◽  
E. L. Frankevich ◽  
B. Uhlhorn ◽  
J. Shinar ◽  
Y. Ding ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Strong Evidence ◽  
Delayed Fluorescence ◽  
Phenylene Vinylene ◽  
Total Emission ◽  
Phenylene Ethynylene ◽  
Frozen Solutions ◽  
Triplet Triplet Annihilation

ABSTRACTThe delayed fluorescence of poly(p-phenylene vinylene) (PPV) and poly(p-phenylene ethynylene) (PPE) derivative solids and frozen solutions at 20 K is described. It provides strong evidence for triplet-triplet annihilation to singlets excitons accounting for up to ∼3% of the total emission in PPV films and ∼1.5% in PPE powder. It also yields triplet lifetimes of 70 and 110 μs in PPV films and frozen solutions, and ∼200 and ∼500 μs in PPE powder and frozen solutions, respectively.

scholarly journals Synthesis of π-Conjugated Polymers Containing Benzotriazole Units via Palladium-Catalyzed Direct C-H Cross-Coupling Polycondensation for OLEDs Applications

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 254
Author(s):  
Dong Han ◽  
Jingwen Li ◽  
Qiang Zhang ◽  
Zewang He ◽  
Zhiwei Wu ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Quantum Efficiency ◽  
Cross Coupling ◽  
Building Blocks ◽  
Gravimetric Analysis ◽  
19F Nmr Spectra ◽  
Light Emitting ◽  
Molecular Weights ◽  
Palladium Catalyzed ◽  
Red Luminescence

Four D-π-A conjugated polymers, namely P1–P4, which contain benzotriazole building blocks in their backbone as acceptor, are synthesized via palladium-catalyzed direct C-H cross-coupling polycondensation of 5,6-difluorobenzotriazole with different thiophene derivatives, including 3-octylthiophene, 2,2’-bithiophene, thieno[3,4-b][1,4]dioxine, and 4,4-dioctyl-4H-silolo-[3,2-b:4,5-b’]dithiophene as donor units, respectively. Taking the polymer P1 as an example, the chemical structure of the polymer is demonstrated by 1H and 19F NMR spectra. The optical, electrochemical, and thermal properties of these polymers are assessed by UV–vis absorption and fluorescence spectroscopy, cyclic voltammetry (CV), and thermal gravimetric analysis (TGA), respectively. DFT simulations of all polymers are also performed to understand their physicochemical properties. Furthermore, P1 and P2, which have relatively higher molecular weights and better fluorescent quantum efficiency than those of P3 and P4, are utilized as lighting emitters for organic light-emitting diodes (OLEDs), affording promising green and red luminescence with 0.07% and 0.14% of maximum external quantum efficiency, respectively, based on a device with an architecture of ITO/PEDOT:PSS/PTAA/the polymer emitting layer/TPBi/LiF/Al.

Structure Design for High Performance n-Type Polymer Thermoelectric Materials

2021 ◽  
Author(s):  
Qi Zhang ◽  
Hengda Sun ◽  
Meifang Zhu
Keyword(s):  
Conjugated Polymers ◽  
Thermoelectric Materials ◽  
High Performance ◽  
Waste Heat ◽  
Building Blocks ◽  
Structure Design ◽  
Potential Candidate ◽  
Polymer Backbone ◽  
P Type ◽  
Polymer Thermoelectric

Abstract Organic thermoelectric (OTE) materials have been regarded as a potential candidate to harvest waste heat from complex, low temperature surfaces of objects and convert it into electricity. Recently, n-type conjugated polymers as organic thermoelectric materials have aroused intensive research in order to improve their performance to match up with their p-type counterpart. In this review, we discuss aspects that affect the performance of n-type OTEs, and further focus on the effect of planarity of backbone on doping efficiency and eventually the TE performance. We then summarize strategies such as implementing rigid n-type polymer backbone or modifying conventional polymer building blocks for more planar conformation. In the outlook part, we conclude forementioned devotions and point out new possibility that may promote the future development of this field.

scholarly journals Defining side chain successions in anthracene-based poly(arylene ethynylene)-alt-poly(phenylene vinylene)s: probing structure–property relationships

2019 ◽  
Vol 10 (39) ◽  
pp. 5339-5347
Author(s):  
Christoph Ulbricht ◽  
Nassima Bouguerra ◽  
Samuel Inack Ngi ◽  
Oliver Brüggemann ◽  
Daniel A. M. Egbe
Keyword(s):  
Conjugated Polymers ◽  
Spectroscopic Study ◽  
Side Chain ◽  
Phenylene Vinylene ◽  
Structure Property ◽  
Structure Property Relationships

A detailed spectroscopic study of nine conjugated polymers with various octyloxy/2-ethylhexyloxy side chain sequences prepared using optimized regio-selective synthetic pathways.

Well-defined alternative polymer semiconductor using large size regioregular building blocks as monomers: electrical and electrochemical properties

2018 ◽  
Vol 6 (21) ◽  
pp. 5662-5670 ◽  
Author(s):  
Bogyu Lim ◽  
Dang Xuan Long ◽  
Song-Yi Han ◽  
Yoon-Chae Nah ◽  
Yong-Young Noh
Keyword(s):  
Molecular Weight ◽  
Conjugated Polymers ◽  
Electrochemical Properties ◽  
Building Blocks ◽  
Synthetic Strategy ◽  
Large Size ◽  
Large Molecular Weight ◽  
Polymer Semiconductor

We report an effective synthetic strategy to achieve well-defined regioregular alternative conjugated polymers using large molecular weight regioregular monomers.

Synthesis of 3,7-diiodo-2,6-di(thiophen-2-yl)benzo[1,2-b:4,5-b′]difurans: functional building blocks for the design of new conjugated polymers

2012 ◽  
Vol 48 (71) ◽  
pp. 8919 ◽  
Author(s):  
Brandon M. Kobilka ◽  
Anton V. Dubrovskiy ◽  
Monique D. Ewan ◽  
Aimée L. Tomlinson ◽  
Richard C. Larock ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Building Blocks

High-Mobility Conjugated Polymers Based on Fused-Thiophene Building Blocks

2011 ◽  
Vol 212 (5) ◽  
pp. 428-443 ◽  
Author(s):  
Yao Liu ◽  
Yunqi Liu ◽  
Xiaowei Zhan
Keyword(s):  
Conjugated Polymers ◽  
High Mobility ◽  
Building Blocks
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