scholarly journals Synergistic photoluminescence enhancement in conjugated polymer-di-ureasil organic–inorganic composites

2015 ◽  
Vol 6 (12) ◽  
pp. 7227-7237 ◽  
Author(s):  
Niamh Willis-Fox ◽  
Ana-Teresa Marques ◽  
Jochen Arlt ◽  
Ullrich Scherf ◽  
Luís D. Carlos ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Conjugated Polymer ◽  
Inorganic Composites ◽  
Photoluminescence Quantum Yield ◽  
Photoluminescence Enhancement

Energy transfer between a hybrid di-ureasil host and conjugated polymer dopants results in a dramatic enhancement in the photoluminescence quantum yield due to exciton isolation at long-lived trap sites.

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.

scholarly journals Enhancing the photoluminescence of surface anchored metal–organic frameworks: mixed linkers and efficient acceptors

2018 ◽  
Vol 20 (17) ◽  
pp. 11564-11576 ◽  
Author(s):  
M. Oldenburg ◽  
A. Turshatov ◽  
D. Busko ◽  
M. Jakoby ◽  
R. Haldar ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Metal Organic Frameworks ◽  
Yield Enhancement ◽  
Photoluminescence Quantum Yield ◽  
Metal Organic

Photoluminescence quantum yield enhancement based on energy transfer in surface-anchored metal–organic frameworks.

FRET-enhanced photoluminescence of perylene diimides by combining molecular aggregation and insulation

2020 ◽  
Vol 8 (26) ◽  
pp. 8953-8961 ◽  
Author(s):  
Bolong Zhang ◽  
Igor Lyskov ◽  
Lachlan J. Wilson ◽  
Randy P. Sabatini ◽  
Anjay Manian ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Molecular Aggregation ◽  
High Concentration ◽  
Efficient Energy Transfer ◽  
Perylene Diimides ◽  
Efficient Energy ◽  
Enhanced Photoluminescence ◽  
Photoluminescence Quantum Yield ◽  
Very High

Samples containing both molecularly insulated and aggregated perylene diimides at high concentration (140 mM) in polymer matrix showed very high photoluminescence quantum yield (85%) as a result of efficient energy transfer.

scholarly journals Synthesis and Acid-Responsiveness of an Insulated π-Conjugated Polymer Containing Spiropyrans in Its Backbone

Molecules ◽  
2019 ◽  
Vol 24 (7) ◽  
pp. 1301 ◽  
Author(s):  
Hiromichi V. Miyagishi ◽  
Takashi Tamaki ◽  
Hiroshi Masai ◽  
Jun Terao
Keyword(s):  
Energy Transfer ◽  
Solid State ◽  
Quantum Yield ◽  
Conjugated Polymer ◽  
Luminescence Quenching ◽  
Polymer Chains ◽  
Phenylene Ethynylene ◽  
Complete Conversion

A π-conjugated polymer containing spiropyrans (SPs), which could be almost completely converted to protonated merocyanines (MCH+) and back to the SP form by adding an acid and a base, respectively, was developed. The insulation of the π-conjugated polymer, referred to as insulated spiropyran-containing poly(p-phenylene ethynylene) (ins-SP-PPE), using permethylated α-cyclodextrins (PM α-CD) suppressed the π-π interaction between the polymer chains containing MCH+, and the installation of PM α-CD improved the switching ability of SPs. The polymer exhibited repeatable acidochromism with almost complete conversion between the SP and MCH+ forms. Photoluminescence measurements were conducted and the acid-induced luminescence quenching of the polymer in the solution was observed, which stemmed from energy transfer from the PPE to MCH+ moieties. In the solid state, the quantum yield of ins-SP-PPE was more than twice that of the uninsulated polymer, which derived from the insulation effects. The acid-induced luminescence quenching was also observed in the solid state.

scholarly journals Engineering Sr-doping for enabling long-term stable FAPb1−xSrxI3 quantum dots with 100% photoluminescence quantum yield

2021 ◽  
Vol 9 (5) ◽  
pp. 1555-1566
Author(s):  
Andrés F. Gualdrón-Reyes ◽  
David F. Macias-Pinilla ◽  
Sofia Masi ◽  
Carlos Echeverría-Arrondo ◽  
Said Agouram ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Toxic Metals ◽  
Environmentally Friendly ◽  
Photoluminescence Quantum Yield ◽  
Improved Performance ◽  
Pb Substitution

The Pb substitution in quantum dots (PQDs) with lesser toxic metals has been widely searched to be environmentally friendly, and be of comparable or improved performance compared to the lead-perovskite.

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