Photoluminescent Polymer Films for Display Applications

1999 ◽  
Vol 558 ◽  
Author(s):  
Anja Palmans ◽  
Andrea Montali ◽  
Christoph Weder ◽  
Paul Smith
Keyword(s):  
Energy Transfer ◽  
Conjugated Polymer ◽  
Dilute Solution ◽  
Phenylene Ethynylene ◽  
Polyethylene Matrix ◽  
Efficient Energy Transfer ◽  
Polymer Backbone ◽  
Flexible Spacer ◽  
The Matrix ◽  
Oriented Polyethylene

ABSTRACTNovel poly(p-phenylene ethynylene) polymers, ANT-OPPE and COU-OPPE, have been prepared, in which anthracene and coumarin sensitizer molecules are covalently attached to the conjugated polymer backbone via a flexible spacer. These polymers show efficient energy transfer from the pendent sensitizer molecule to the PPE backbone, both in dilute solution as well as in an oriented polyethylene matrix. In case of ANT-OPPE, we found that the PPE backbone adapts the orientation of the matrix and is efficiently oriented, while the anthracene moiety remains essentially isotropic, resulting in a state-of-the-art polarizing energy transfer for this system.

Photoluminescent Polymer Films for Display Applications

1999 ◽  
Vol 560 ◽  
Author(s):  
Anja Palmans ◽  
Andrea Montali ◽  
Christoph Weder ◽  
Paul Smith
Keyword(s):  
Energy Transfer ◽  
Conjugated Polymer ◽  
Dilute Solution ◽  
Phenylene Ethynylene ◽  
Polyethylene Matrix ◽  
Efficient Energy Transfer ◽  
Polymer Backbone ◽  
Flexible Spacer ◽  
The Matrix ◽  
Oriented Polyethylene

ABSTRACTNovel poly(ρ-phenylene ethynylene) polymers, ANT-OPPE and COU-OPPE, have been prepared, in which anthracene and coumarin sensitizer molecules are covalently attached to the conjugated polymer backbone via a flexible spacer. These polymers show efficient energy transfer from the pendent sensitizer molecule to the PPE backbone, both in dilute solution as well as in an oriented polyethylene matrix. In case of ANT-OPPE, we found that the PPE backbone adapts the orientation of the matrix and is efficiently oriented, while the anthracene moiety remains essentially isotropic, resulting in a state-of-the-art polarizing energy transfer for this system.

scholarly journals Energy up-conversion in dilute polyfluorene solutions

2007 ◽  
Vol 5 (4) ◽  
pp. 923-930
Author(s):  
Alexander Kuehne ◽  
Allan Mackintosh ◽  
David Armstrong ◽  
Richard Pethrick
Keyword(s):  
Energy Transfer ◽  
Polymer Chain ◽  
Conjugated Polymer ◽  
Blue Emission ◽  
Dilute Solution ◽  
Highly Efficient ◽  
Localised States ◽  
Homo Lumo

AbstractPoly(9,9-dioctylfluorene) (PFO) shows highly efficient blue emission with photo excitation occurring between 340–400 nm. Here we show that PFO can in dilute solution emit at a wavelength well below that at which it is being exited. This, we propose is related to an energy transfer from conjugated parts of the polymer chain into more localised states which then emit at a lower wavelength. These localised states can be considered as defects in the conjugation of the polymer or as chain ends. These may produce quasi monomer or quasi dimer species within the chain, which will have a HOMO-LUMO gap of higher energy than the conjugated polymer. These then fluoresce at the lower wavelength; essentially causing, by energy transfer, a process of energy up-conversion.

Enhancement of Poly(9,9'-di-n-octylfluorenyl-2.7-diyl) Optoelectronic Properties in Novel Conjugated Polymer/Laser Dye Hybrid OLEDs

2013 ◽  
Vol 756 ◽  
pp. 281-288 ◽  
Author(s):  
Bandar Ali Al-Asbahi ◽  
Mohammad Hafizuddin Haji Jumali ◽  
Chi Chin Yap ◽  
Muhamad Mat Salleh
Keyword(s):  
Energy Transfer ◽  
Indium Tin Oxide ◽  
Conjugated Polymer ◽  
Average Distance ◽  
Optoelectronic Properties ◽  
Laser Dye ◽  
Efficient Energy Transfer ◽  
Solution Blending ◽  
Blending Method ◽  
Donor And Acceptor

The effect of laser dye (Fluorol 7GA) content on the optoelectronic properties of Poly ( 9,9'-di-n-octylfluorenyl-2.7-diyl) conjugated polymer (PFO) based OLEDs has been investigated. The PFO/Fluorol 7GA hybrids with weight ratios between 0.1 and 5 wt. % were prepared using the solution blending method. The blends were deposited on ITO (Indium Tin Oxide) substrate using spin-coating technique. Thin layer of aluminum was deposited on top of the films to act as electrode. Absorption and photoluminescence techniques were used to investigate the energy transfer in the blend. The device performance was investigated in terms of electroluminescence, luminance, luminance efficiency and color measurements. The Förster energy transfer occurred in the blends as evidence from optical spectroscopy and average distance between donor and acceptor molecules. The optimum ratio was 0.5 wt. % where highest enhancement in OLEDs performance was observed. These were attributed to the synchronize effect of efficient energy transfer from PFO to Fluorol 7GA and carrier trapping processes.

Enhanced electrophosphorescence via highly efficient energy transfer from conjugated polymer

2005 ◽  
Vol 86 (17) ◽  
pp. 171108 ◽  
Author(s):  
Tae-Ho Kim ◽  
Dong-Hee Yoo ◽  
Jong Hyeok Park ◽  
O Ok Park ◽  
Jae-Woong Yu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Conjugated Polymer ◽  
Efficient Energy Transfer ◽  
Efficient Energy ◽  
Highly Efficient

Singlet and Triplet Energy Transfer in Phosphorescent Dye Doped Polymer Light Emitting Devices

2001 ◽  
Vol 708 ◽  
Author(s):  
Yong-Young Noh ◽  
Chang-Lyoul Lee ◽  
Hae Won Lee ◽  
Hyun-Nam Cho ◽  
Jang-Joo Kim
Keyword(s):  
Energy Transfer ◽  
Conjugated Polymer ◽  
Triplet Energy ◽  
Efficient Energy Transfer ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Host Materials ◽  
Triplet Energy Transfer ◽  
Polymer Light Emitting Devices ◽  
Doped Polymer

ABSTRACTEffect of host polymers on energy transfer in phosphorescent dye doped polymer light emitting devices has been investigated. Poly (N-vinylcarbazol) [PVK] and poly (9,9'-di-n-hexyl-2,7-fluorene-alt-1,4(2,5dinhexyloxy) phenylene) [PFHP] were examined as the host materials for the phosphorescent dyes fac tris(2-phenypyridine) irdium(III) [Ir(ppy)3] and 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin platinum(II) [PtOEP]. The host and guest materials have the large spectrum overlap between the emission of the hosts and absorption of the guests. When the guests were doped in PVK, the singlet-singlet and triplet-triplet energy transfer took place efficiently. On the contrary, the energy transfer did not take place from φ-conjugated polymer PFHP to the guests, even though common requirements for Förster and Dexter energy transfer were fulfilled. Host aggregation in PFHP based phosphorescent dye doped light emitting devices can play an undesired role obstructing 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.

Structural and photoluminescence properties of Eu3+ doped α-Ag2WO4 synthesized by the green coprecipitation methodology

2015 ◽  
Vol 44 (40) ◽  
pp. 17673-17685 ◽  
Author(s):  
Ivo M. Pinatti ◽  
Içamira C. Nogueira ◽  
Wyllamanney S. Pereira ◽  
Paula F. S. Pereira ◽  
Rosana F. Gonçalves ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Broad Band ◽  
Coprecipitation Method ◽  
Photoluminescence Properties ◽  
Efficient Energy Transfer ◽  
Efficient Energy ◽  
Pl Spectra ◽  
The Matrix

Europium doped silver tungstates α-Ag2−3xEuxWO4 (x = 0, 0.0025, 0.005, 0.0075 and 0.01 mol) were synthesized by the coprecipitation method at 90 °C for 30 minutes. PL spectra showed a broad band related to the [WO6] group and characteristic narrow peaks due to the f–f transitions of Eu3+ as a result of efficient energy transfer from the matrix.

Efficient artificial light-harvesting systems based on aggregation-induced emission constructed in supramolecular gels

Soft Matter ◽  
2021 ◽  
Author(s):  
Xinxian Ma ◽  
bo qiao ◽  
Jinlong Yue ◽  
JingJing Yu ◽  
yutao geng ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rhodamine B ◽  
Fluorescent Dyes ◽  
Light Harvesting ◽  
Artificial Light ◽  
Efficient Energy Transfer ◽  
Aggregation Induced Emission ◽  
Efficient Energy ◽  
Harvesting Systems ◽  
Acyl Hydrazone

Based on a new designed acyl hydrazone gelator (G2), we developed an efficient energy transfer supramolecular organogel in glycol with two different hydrophobic fluorescent dyes rhodamine B (RhB) and acridine...

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