Coexistence of Förster and Dexter Energy Transfer Pathways from an Antenna Ligand to Lanthanide Ion in Trivalent Europium Complexes through Phosphine-Oxide Bridges

<br>Trivalent europium (Eu3+) complexes are attractive materials for luminescence applications if energy transfer from antenna ligands to the lanthanide ion is efficient. However, the microscopic mechanisms of the transfer remain elusive and fundamental physical chemistry questions still require answers. We track the energy transfer processes in a luminescent complex Eu(hfa)3(DPPTO)2 (hfa: hexafluoroacetylacetonate, DPPTO: 2-diphenylphosphoryltriphenylene) using time-resolved photoluminescence spectroscopy. In addition to the conventional Dexter-type energy transfer pathway through the T1 state of the ligands, we discovered the Forster energy transfer pathway from the S1 of the DPPTO ligands to the 5D1 state of Eu3+ through the weak electronic interaction of a phosphine-oxide bridge. The short timescale of the energy transfer (16 ns, 127 ns) results in its high quantum yield. The coexistence of the distinct energy transfer pathways from a single chromophore is important for establishing design strategies of luminescent complexes. <br>

Download Full-text

Ферстеровский резонансный перенос энергии с участием светлых и темных экситонов в массивах эпитаксиальных квантовых точек CdSe/ZnSe

Физика твердого тела ◽

10.21883/ftt.2018.08.46246.03gr ◽

2018 ◽

Vol 60 (8) ◽

pp. 1575

Author(s):

Т.Н. Михайлов ◽

Е.А. Европейцев ◽

К.Г. Беляев ◽

A.A. Торопов ◽

A.В. Родина ◽

...

Keyword(s):

Energy Transfer ◽

Excited States ◽

Energy Transfer Process ◽

Dipole Interaction ◽

Energy Transfer Mechanism ◽

Time Resolved ◽

Decay Times ◽

Förster Energy Transfer ◽

Excitonic States ◽

Time Resolved Photoluminescence

AbstractUsing time-resolved photoluminescence (PL) spectroscopy, we establish the presence of the Förster energy transfer mechanism between two arrays of epitaxial CdSe/ZnSe quantum dots (QDs) of different sizes. The mechanism operates through dipole–dipole interaction between ground excitonic states of the smaller QDs and excited states of the larger QDs. The dependence of energy transfer efficiency on the width of barrier separating the QD insets is shown to be in line with the Förster mechanism. The temperature dependence of the PL decay times and PL intensity suggests the involvement of dark excitons in the energy transfer process.

Download Full-text

Dual Energy Transfer Pathways from an Antenna Ligand to Lanthanide Ion in Trivalent Europium Complexes with Phosphine-Oxide Bridges

The Journal of Physical Chemistry A ◽

10.1021/acs.jpca.0c02224 ◽

2020 ◽

Vol 124 (33) ◽

pp. 6601-6606

Author(s):

Shiori Miyazaki ◽

Kiyoshi Miyata ◽

Haruna Sakamoto ◽

Fumiya Suzue ◽

Yuichi Kitagawa ◽

...

Keyword(s):

Energy Transfer ◽

Phosphine Oxide ◽

Dual Energy ◽

Europium Complexes ◽

Lanthanide Ion ◽

Trivalent Europium ◽

Antenna Ligand

Download Full-text

Horizontal versus vertical charge and energy transfer in hybrid assemblies of semiconductor nanoparticles

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.3.72 ◽

2012 ◽

Vol 3 ◽

pp. 629-636 ◽

Cited By ~ 7

Author(s):

Gilad Gotesman ◽

Rahamim Guliamov ◽

Ron Naaman

Keyword(s):

Energy Transfer ◽

Charge Transfer ◽

Horizontal Plane ◽

Quartz Substrate ◽

Vertical Direction ◽

Time Resolved ◽

Transfer Processes ◽

Donor And Acceptor ◽

Hybrid Assemblies ◽

Time Resolved Photoluminescence

We studied the photoluminescence and time-resolved photoluminescence from self-assembled bilayers of donor and acceptor nanoparticles (NPs) adsorbed on a quartz substrate through organic linkers. Charge and energy transfer processes within the assemblies were investigated as a function of the length of the dithiolated linker (DT) between the donors and acceptors. We found an unusual linker-length-dependency in the emission of the donors. This dependency may be explained by charge and energy transfer processes in the vertical direction (from the donors to the acceptors) that depend strongly on charge transfer processes occurring in the horizontal plane (within the monolayer of the acceptor), namely, parallel to the substrate.

Download Full-text

Ultrafast Energy-Transfer Pathway in a Purple-Bacterial Photosynthetic Core Antenna, as Revealed by Femtosecond Time-Resolved Spectroscopy

Angewandte Chemie International Edition ◽

10.1002/anie.201003771 ◽

2010 ◽

Vol 50 (5) ◽

pp. 1097-1100 ◽

Cited By ~ 18

Author(s):

Daisuke Kosumi ◽

Satoshi Maruta ◽

Tomoko Horibe ◽

Ritsuko Fujii ◽

Mitsuru Sugisaki ◽

...

Keyword(s):

Energy Transfer ◽

Time Resolved ◽

Time Resolved Spectroscopy ◽

Energy Transfer Pathway

Download Full-text

Investigation of Energy Transfer in Star-Shaped White Polymer Light-Emitting Devices via the Time-Resolved Photoluminescence

Materials ◽

10.3390/ma11091719 ◽

2018 ◽

Vol 11 (9) ◽

pp. 1719 ◽

Cited By ~ 3

Author(s):

Hui He ◽

Xiaoqing Liao ◽

Jiang Cheng ◽

Ying Li ◽

Junsheng Yu ◽

...

Keyword(s):

Energy Transfer ◽

Current Efficiency ◽

Intermolecular Interactions ◽

Efficient Energy Transfer ◽

Time Resolved ◽

Light Emitting ◽

Light Emitting Devices ◽

Efficient Energy ◽

Polymer Light Emitting Devices ◽

Time Resolved Photoluminescence

A series of white polymer light-emitting devices (WPLEDs) were fabricated by utilizing star-shaped white-emission copolymers containing tri[1-phenylisoquinolinato-C2,N]iridium (Ir(piq)3), fluorenone (FO) and poly(9,9-dioctylfluorene) (PFO) as red-, green- and blue-emitting (RGB) components, respectively. In these WPLEDs, a maximum current efficiency of 6.4 cd·A−1 at 20 mA·cm−2 and Commission Internationale d’Eclairage (CIE) coordinates of (0.33, 0.32) were achieved, and the current efficiency was still kept to 4.2 cd·A−1 at the current density of 200 mA·cm−2. To investigate energy transfer processes among the three different chromophores of the star-shaped copolymers in these WPLEDs, the time-resolved photoluminescence (PL) spectra were recorded. By comparing the fluorescence decay lifetimes of PFO chromophores in the four star-like white-emitting copolymers, the efficient energy transfer from PFO units to Ir(piq)3 and FO chromophores was confirmed. From time-resolved PL and the analysis of energy transfer process, the results as follows were proved. Owing to the star-like molecular structure and steric hindrance effect, intermolecular interactions and concentrations quenching in the electroluminescence (EL) process could also be sufficiently suppressed. The efficient energy transfer also reduced intermolecular interactions’ contribution to the enhanced device performances compared to the linear single-polymer white-light systems. Moreover, saturated stable white emission results from the joint of energy transfer and trap-assisted recombination. This improved performance is expected to provide the star-like white-emitting copolymers with promising applications for WPLEDs.

Download Full-text

Switching on Near-Infrared Light in Lanthanide-doped CsPbCl3 Perovskite Nanocrystals.pdf

10.26434/chemrxiv.13352549 ◽

2020 ◽

Author(s):

Min Zeng ◽

Federico Locardi ◽

Dimitrije Mara ◽

Zeger Hens ◽

Rik Van Deun ◽

...

Keyword(s):

Energy Transfer ◽

Near Infrared ◽

Lanthanide Ions ◽

Infrared Light ◽

Quantum Yields ◽

General Strategy ◽

Time Resolved ◽

Nir Emission ◽

Photoluminescence Studies ◽

Time Resolved Photoluminescence

The accessible emission spectral range of lead halide perovskite (LHP) CsPbX3 (X = Cl−, Br−, I−) nanocrystals (NCs) has remained so far limited to wavelengths below 1 μm, corresponding to the emission line of Yb3+, whereas the direct sensitization of other near-infrared (NIR) emitting lanthanide ions is unviable. Herein, we present a general strategy to enable intense NIR emission from Er3+ at ~1.5 μm, Ho3+ at ~1.0 μm and Nd3+ at ~1.06 μm through a Mn2+-mediated energy-transfer pathway. Steady-state and time-resolved photoluminescence studies show that energy-transfer efficiencies of about 39%, 35% and 70% from Mn2+ to Er3+, Ho3+ and Nd3+ are obtained, leading to photoluminescence quantum yields of ~0.8%, ~0.7% and ~3%, respectively. This work provides guidance on constructing energy-transfer pathways in semiconductors and opens new perspectives for the development of lanthanide-functionalized LHPs as promising materials for optoelectronic devices operating in the NIR region.

Download Full-text

Proof Of Forster Energy Transfer Between Fad And Fmn In Cytochrome P450 Reductase By Time-Resolved Red-Edge Spectroscopy.

10.1117/12.945398 ◽

1988 ◽

Cited By ~ 4

Author(s):

P I. Bastiaens ◽

P J. Bonants ◽

A van Hoek ◽

F Muller ◽

A J. Visser

Keyword(s):

Cytochrome P450 ◽

Energy Transfer ◽

Cytochrome P450 Reductase ◽

Time Resolved ◽

P450 Reductase ◽

Red Edge ◽

Förster Energy Transfer

Download Full-text

Spectral and time-resolved photoluminescence of human platelets doped with platinum nanoparticles

PLoS ONE ◽

10.1371/journal.pone.0256621 ◽

2021 ◽

Vol 16 (9) ◽

pp. e0256621

Author(s):

Karina Matveeva ◽

Andrey Zyubin ◽

Elizaveta Demishkevich ◽

Vladimir Rafalskiy ◽

Ekaterina Moiseeva ◽

...

Keyword(s):

Energy Transfer ◽

Resonance Energy Transfer ◽

Resonance Energy ◽

Pt Nanoparticles ◽

Human Platelets ◽

Platelet Membrane ◽

Spectroscopy Analysis ◽

Time Resolved ◽

Transfer Parameters ◽

Time Resolved Photoluminescence

This paper describes a detailed study of spectral and time-resolved photoprocesses in human platelets and their complexes with platinum (Pt) nanoparticles (NPs). Fluorescence, quantum yield, and platelet amino acid lifetime changes in the presence and without femtosecond ablated platinum NPs have been studied. Fluorescence spectroscopy analysis of main fluorescent amino acids and their residues (tyrosine (Tyr), tryptophan (Trp), and phenylalanine (Phe)) belonging to the platelet membrane have been performed. The possibility of energy transfer between Pt NPs and the platelet membrane has been revealed. Förster Resonance Energy Transfer (FRET) model was used to perform the quantitative evaluation of energy transfer parameters. The prospects of Pt NPs usage deals with quenching-based sensing for pathology’s based on platelet conformations as cardiovascular diseases have been demonstrated.

Download Full-text