Organic Triplet Excited States of Gold(I) Complexes with Oligo(o- orm-phenyleneethynylene) Ligands: Conjunction of Steady-State and Time-Resolved Spectroscopic Studies on Exciton Delocalization and Emission Pathways

2011 ◽  
Vol 133 (35) ◽  
pp. 14120-14135 ◽  
Author(s):  
Wei Lu ◽  
Wai-Ming Kwok ◽  
Chensheng Ma ◽  
Chris Tsz-Leung Chan ◽  
Ming-Xin Zhu ◽  
...  
Keyword(s):  
Steady State ◽  
Excited States ◽  
Spectroscopic Studies ◽  
Time Resolved ◽  
Triplet Excited States

scholarly journals Ground- and excited-state characteristics in photovoltaic polymer N2200

RSC Advances ◽  
2021 ◽  
Author(s):  
Guanzhao Wen ◽  
Xianshao Zou ◽  
Rong Hu ◽  
Jun Peng ◽  
Zhifeng Chen ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Excited State ◽  
Steady State ◽  
Excited States ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Time Dependent ◽  
Functional Theory ◽  
Time Resolved ◽  
Dependent Density

Ground- and excited-states properties of N2200 have been studied by steady-state and time-resolved spectroscopies as well as time-dependent density functional theory calculations.

Bond Shortening (1.4 Å) in the Singlet and Triplet Excited States of [Ir2(dimen)4]2+in Solution Determined by Time-Resolved X-ray Scattering

2011 ◽  
Vol 50 (19) ◽  
pp. 9329-9336 ◽  
Author(s):  
Kristoffer Haldrup ◽  
Tobias Harlang ◽  
Morten Christensen ◽  
Asmus Dohn ◽  
Tim Brandt van Driel ◽  
...  
Keyword(s):  
Excited States ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Triplet Excited States ◽  
Ray Scattering

Combined theoretical and time-resolved photoluminescence investigations of [Mo6Bri8Bra6]2− metal cluster units: evidence of dual emission

2015 ◽  
Vol 17 (43) ◽  
pp. 28574-28585 ◽  
Author(s):  
K. Costuas ◽  
A. Garreau ◽  
A. Bulou ◽  
B. Fontaine ◽  
J. Cuny ◽  
...  
Keyword(s):  
Excited States ◽  
Metal Cluster ◽  
Energy Shift ◽  
Dual Emission ◽  
Time Resolved ◽  
Nir Emission ◽  
Triplet Excited States ◽  
Time Resolved Photoluminescence

Distinct emissive species have been identified in [Mo6Bri8Bra6]2− containing systems. Strong geometrical relaxations of the triplet excited states are responsible for the huge energy shift leading to intense red-NIR emission.

scholarly journals Manipulating spatial alignment of donor and acceptor in host-guest MOF for TADF

2021 ◽  
Author(s):  
Xiao-Ting Liu ◽  
Weijie Hua ◽  
Hong-Xiang Nie ◽  
Mingxing Chen ◽  
Ze Chang ◽  
...  
Keyword(s):  
Excited States ◽  
Delayed Fluorescence ◽  
Energy Splitting ◽  
Time Resolved ◽  
Face To Face ◽  
Spatial Alignment ◽  
Stacking Pattern ◽  
Donor And Acceptor ◽  
Loading Ratio ◽  
Triplet Excited States

Abstract Thermally activated delayed fluorescence (TADF) was achieved when electron-rich triphenylene (Tpl) donors (D) were confined to a cage-based porous MOF host (NKU-111) composed of electron-deficient 2,4,6-tri(pyridin-4-yl)-1,3,5-triazine (Tpt) acceptor (A) as the ligand. The spatially-separated D and A molecules in a face-to-face stacking pattern generated strong through-space charge transfer (CT) interactions with a small singlet-triplet excited states energy splitting (∼0.1 eV), which enabled TADF. The resulting Tpl@NKU-111 exhibited an uncommon enhanced emission intensity as the temperature increased. Extensive steady-state and time-resolved spectroscopic measurements and first-principles simulations revealed the chemical and electronic structure of this compound in both the ground and low-lying excited states. A double-channel (T1, T2) intersystem crossing mechanism with S1 was found and explained as single-directional CT from the degenerate HOMO-1/HOMO of the guest donor to the LUMO + 1 of one of the nearest acceptors. The rigid skeleton of the compound and effective through-space CT enhanced the photoluminescence quantum yield (PLQY). A maximum PLQY of 57.36% was achieved by optimizing the Tpl loading ratio in the host framework. These results indicate the potential of the MOFs for the targeted construction and optimization of TADF materials.

Dramatic luminescence signal from a Co(ii)-based metal–organic compound due to the construction of charge-transfer bands with Al3+ and Fe3+ ions in water: steady-state and time-resolved spectroscopic studies

2020 ◽  
Vol 44 (11) ◽  
pp. 4376-4385 ◽  
Author(s):  
Pooja Daga ◽  
Prakash Majee ◽  
Debal Kanti Singha ◽  
Priyanka Manna ◽  
Sayani Hui ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Steady State ◽  
Organic Compound ◽  
Spectroscopic Studies ◽  
Charge Transfer Complexes ◽  
Time Resolved ◽  
Luminescence Signal ◽  
Turn On ◽  
Metal Organic

A Co(ii)-based metal–organic compound exhibits luminescence turn-on by Al3+ and quenching by Fe3+ due to the formation of charge-transfer complexes/adducts.

ChemInform Abstract: Spectroscopic Studies of the Singlet and Triplet Excited States of Some Substituted Biphenylenes.

ChemInform ◽  
2010 ◽  
Vol 24 (52) ◽  
pp. no-no
Author(s):  
M. SUAREZ ◽  
C. DEVADOSS ◽  
G. B. SCHUSTER
Keyword(s):  
Excited States ◽  
Spectroscopic Studies ◽  
Triplet Excited States

Optimization of a Safranine O three-component photoinitiating system for use in holographic recording

2015 ◽  
Vol 93 (12) ◽  
pp. 1345-1353 ◽  
Author(s):  
Ahmad Ibrahim ◽  
Bandar El Fouhaili ◽  
Aurélie Chan Yong ◽  
Christian Ley ◽  
Xavier Allonas ◽  
...  
Keyword(s):  
Excited States ◽  
Irradiation Time ◽  
Holographic Recording ◽  
Time Resolved ◽  
The Matrix ◽  
Resin Formulation ◽  
High Diffraction Efficiency ◽  
Triplet Excited States ◽  
Safranine O ◽  
High Diffraction

The coupling between a holographic resin, combining multiple monomers and additives, with photoinitiating systems (PIS) is not straightforward. In this paper, a classic PIS based on Safranine O (SFH+) as dye, an amine (ethyl-4-(dimethylamino)benzoate) as electron donor, and a triazine derivative (2-(4-methoxyphenyl)-4,6-bis(trichloromethyl)-1,3,5-triazine) as electron acceptor for holographic recording was studied using time-resolved spectroscopic experiments. By taking into account the viscosity of the matrix, a method to evaluate the overall quantum yield of radicals released is proposed and the contribution of singlet and triplet excited states of SFH+ in the formation of radicals is evaluated. Then the corresponding photopolymerization efficiencies of the PIS, studied by real-time FTIR, are compared with holographic recording experiments: this system allows the formation of a hologram with high diffraction efficiency (0.9) in 3 s of irradiation time. It is shown that besides holographic resin formulation, the photochemistry of PIS also impacts the hologram formation.

Time-resolved and Steady-state Fluorescence Spectroscopic Studies of the Human Lens with Comparison to Argpyrimidine, Pentosidine and 3-OH-kynurenine¶

2007 ◽  
Vol 76 (5) ◽  
pp. 549-554 ◽  
Author(s):  
Line Kessel ◽  
Stanislav Kalinin ◽  
Ram H. Nagaraj ◽  
Michael Larsen ◽  
Lennart B.-Å. Johansson
Keyword(s):  
Steady State ◽  
Spectroscopic Studies ◽  
Human Lens ◽  
Time Resolved ◽  
Steady State Fluorescence
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