Photophysical properties and energy transfer mechanism of PFO/Fluorol 7GA hybrid thin films

Al‐Asbahi, Bandar Ali; Jumali, Mohammad Hafizuddin Haji; Yap, Chi Chin; Flaifel, Moayad Husein; Salleh, Muhamad Mat

doi:10.1016/j.jlumin.2013.03.031

Cited by 20 publications

(14 citation statements)

References 55 publications

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“…Both the φ DA and τ DA values of the donor (PFO) in the ternary hybrid thin films were estimated from the intensities of the photoluminescence spectra of the PFO/MEH-PPV hybrid without and with various PQD content ratios. As reported elsewhere [ 8 , 23 , 24 ], the following formula can be used to determine both φ DA and τ DA based on the donor emission intensities I D and I DA in the absence and presence of acceptors, respectively:

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…These values were systematically reduced as the PQD content increased, indicating that radiative energy transfer was possible in the ternary system. Moreover, since these values (ϕ DA and τ DA ) were smaller than those of the pristine donor (ϕ D = 0.72 and τ D = 364 ps [23]), an efficient non-radiative energy transfer could occur in the binary hybrid thin films of PFO/MEH-PPV in the presence of PQDs. The concentration of the acceptor (MEH-PPV) that was required to reduce the PFO emission intensity of the hybrid thin films to half its value (A 1/2 ) could be estimated by determining the k SV values of the energy transfer from PFO to MEH-PPV (Case I).…”

Section: Fret Parameters Of the Ternary Hybrid Thin Filmsmentioning

confidence: 93%

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Triplet Energy Transfer Mechanism of Ternary Organic Hybrid Thin Films of PFO/MEH-PPV/CsPbBr3 Perovskite Quantum Dots

et al. 2020

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The triplet energy transfer mechanism of novel poly(9,9-di-n-octylflourenyl-2,7-diyl) (PFO)/poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV)/CsPbBr3 perovskite quantum dot (PQD) hybrid thin films was comprehensively investigated. The concentrations of PFO and MEH-PPV in all the specimens were fixed, while the PQD content was varied with various weight ratios and premixed by a solution blending method before it was spin-coated onto glass substrates. The triplet non-radiative Förster resonance energy transfers (FRETs) in the PFO/MEH-PPV/PQDs ternary blend, the dual FRET from PFO to both PQDs and MEH-PPV, and the secondary FRET from PQDs to MEH-PPV were observed. The values of the Förster radius (Ro) of FRET from PFO to MEH-PPV in the presence of various PQD contents (Case I) increased from 92.3 to 104.7 Å, and they decreased gradually from 68.0 to 39.5 Å for FRET from PFO to PQDs in the presence of MEH-PPV (Case II). These Ro values in both cases confirmed the dominance of FRET in ternary hybrid thin films. Upon increasing the PQD content, the distance between the donor and acceptor molecules (RDA) and the conjugation length (Aπ) in both cases gradually decreased. The small values of Ro, RDA, and Aπ with a decrease in the energy transfer lifetime (τET) due to an increase in the PQD contents in both Cases I and II confirmed the efficient FRET in the hybrid. To prevent intermolecular transfer in PFO, the concentrations of MEH-PPV (Case I) and PQDs (Case II) should be decreased to a range of 0.57–0.39 mM and increased in the range of 1.42–7.25 mM.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Fret Parameters Of the Ternary Hybrid Thin Filmsmentioning

confidence: 93%

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Triplet Energy Transfer Mechanism of Ternary Organic Hybrid Thin Films of PFO/MEH-PPV/CsPbBr3 Perovskite Quantum Dots

et al. 2020

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“…This current reduction can be ascribed to MEH-PPV trapping both holes and electrons in PFO and instantaneously holding back their transport. Many reports demonstrate that lower current (and higher resistivity) may cause higher efficiency in exciton confinement and hole-electron recombination, which are crucial for better OLED device performance [33,34,35].…”

Section: Resultsmentioning

confidence: 99%

Influence of SiO2/TiO2 Nanocomposite on the Optoelectronic Properties of PFO/MEH-PPV-Based OLED Devices

Al‐Asbahi

2018

Polymers

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The influence of SiO2/TiO2 nanocomposites on the performance of organic light-emitting diodes (OLEDs) based on poly(9,9′-di-n-octylfluorenyl-2,7-diyl) (PFO) and various amounts of poly(2-methoxy-5-(2-ethyl-hexyloxy)-1,4-phenylene-vinylene) (MEH-PPV) was investigated. Prior to the fabrication of the OLEDs on indium-tin oxide (ITO) substrates, the hybrids of PFO/MEH-PPV, in the presence and absence of the SiO2/TiO2 nanocomposites, were prepared via the solution blending technique. Improvement of the performances of the devices in the presence of the SiO2/TiO2 nanocomposites was detected. The existence of the SiO2/TiO2 nanocomposites led to better charge carrier injection and, thus, a significant reduction in the turn-on voltage of the devices. The enhancement of MEH-PPV electroluminescence peaks in the hybrids in the presence of SiO2/TiO2 nanocomposites is not only a result of the Förster resonance energy transfer, but also of hole-electron recombination, which is of greater significance. Moreover, the existence of the SiO2/TiO2 nanocomposites led to a shift of the CIE chromaticity coordinates of the devices.

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“…The incorporation of conjugated polymers as a matrix layer in optoelectronic devices based on perovskites can play a significant role in enhancing the morphology of the films resulting in superior device performance [14,15]. Moreover, through-space or dipole-dipole energy transfer plays a significant role in the donor/acceptor hybrids that have been used to produce optoelectronic devices with high performance efficiency [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Donor-Acceptor Concentration Ratios on Non-Radiative Energy Transfer in Zero-Dimensional Cs4PbBr6 Perovskite/MEH-PPV Nanocomposite Thin Films

2020

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Composite materials with different concentration ratios of a hybrid of zero-dimensional (0-D) Cs4PbBr6 perovskite, which acts as a donor (D), and poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), which acts as an acceptor (A), were successfully prepared via a solution blending method prior to being deposited onto glass substrates by a spin-coating technique. The influence of acceptor content on the structural, optical, and energy transfer properties of the donor was investigated. The perovskite nanocrystals formed thin films without any chemical interactions within a matrix of MEH-PPV in the blend. The possibility of dipole–dipole (non-radiative) energy transfer from the 0-D Cs4PbBr6 to the MEH-PPV was proven. The energy transfer parameters such as Ro (critical distance of the energy transfer), kapp (apparent quenching constant), ∅ D A (quantum yield of D in the presence of A), τ D A (lifetime of D in the presence of A), PDA (probability of energy transfer), η (efficiency of energy transfer), RDA (energy transfer radius), kET (energy transfer rate constant), TDR (total decay rate), Ao (critical concentration of A), and Aπ (conjugation length) were calculated based on the absorption and emission measurements.

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Photophysical properties and energy transfer mechanism of PFO/Fluorol 7GA hybrid thin films

Cited by 20 publications

References 55 publications

Triplet Energy Transfer Mechanism of Ternary Organic Hybrid Thin Films of PFO/MEH-PPV/CsPbBr3 Perovskite Quantum Dots

Triplet Energy Transfer Mechanism of Ternary Organic Hybrid Thin Films of PFO/MEH-PPV/CsPbBr3 Perovskite Quantum Dots

Influence of SiO2/TiO2 Nanocomposite on the Optoelectronic Properties of PFO/MEH-PPV-Based OLED Devices

Effect of Donor-Acceptor Concentration Ratios on Non-Radiative Energy Transfer in Zero-Dimensional Cs4PbBr6 Perovskite/MEH-PPV Nanocomposite Thin Films

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