Influence of Triplet State Multidimensionality on Excited State Lifetimes of Bis-tridentate RuII Complexes: A Computational Study

2012 ◽  
Vol 116 (3) ◽  
pp. 1041-1050 ◽  
Author(s):  
Tomas Österman ◽  
Maria Abrahamsson ◽  
Hans-Christian Becker ◽  
Leif Hammarström ◽  
Petter Persson
Keyword(s):  
Excited State ◽  
Triplet State ◽  
Computational Study ◽  
Excited State Lifetimes

Extending Excited-state Lifetimes by Interchromophoric Triplet-state Equilibration in a Pyrene-Ru(II)diimine Dyad System

2003 ◽  
Vol 15 (7-8) ◽  
pp. 627-637 ◽  
Author(s):  
Stéphanie Leroy-lhez ◽  
Colette Belin ◽  
Anthony D'aleo ◽  
René M. Williams ◽  
Luisa De Cola ◽  
...  
Keyword(s):  
Excited State ◽  
Triplet State ◽  
Excited State Lifetimes

scholarly journals Triplet energies and excimer formation in meta - and para -linked carbazolebiphenyl matrix materials

2015 ◽  
Vol 373 (2044) ◽  
pp. 20140446 ◽  
Author(s):  
Sergey A. Bagnich ◽  
Alexander Rudnick ◽  
Pamela Schroegel ◽  
Peter Strohriegl ◽  
Anna Köhler
Keyword(s):  
Excited State ◽  
Triplet State ◽  
Spectroscopic Investigation ◽  
Triplet Excited State ◽  
Conjugation Length ◽  
Triplet Energy ◽  
Excimer Formation

We present a spectroscopic investigation on the effect of changing the position where carbazole is attached to biphenyl in carbazolebiphenyl (CBP) on the triplet state energies and the propensity to excimer formation. For this, two CBP derivatives have been prepared with the carbazole moieties attached at the ( para ) 4- and 4 ′ -positions ( p CBP) and at the ( meta ) 3- and 3 ′ -positions ( m CBP) of the biphenyls. These compounds are compared to analogous m CDBP and p CDBP, i.e. two highly twisted carbazoledimethylbiphenyls, which have a high triplet energy at about 3.0 eV and tend to form triplet excimers in a neat film. This torsion in the structure is associated with localization of the excited state onto the carbazole moieties. We find that in m CBP and p CBP, excimer formation is prevented by localization of the triplet excited state onto the central moiety. As conjugation can continue from the central biphenyls into the nitrogen of the carbazole in the para -connected p CBP, emission involves mainly the benzidine. By contrast, the meta -linkage in m CBP limits conjugation to the central biphenyl. The associated shorter conjugation length is the reason for the higher triplet energy of 2.8 eV in m CBP compared with the 2.65 eV in p CBP.

Ultrafast Spectroscopy of Arylchlorodiazirines: Hammett Correlations of Excited State Lifetimes

2009 ◽  
Vol 131 (46) ◽  
pp. 16652-16653 ◽  
Author(s):  
Yunlong Zhang ◽  
Lei Wang ◽  
Robert A. Moss ◽  
Matthew S. Platz
Keyword(s):  
Excited State ◽  
Ultrafast Spectroscopy ◽  
Excited State Lifetimes

Steric Effects in the Electronic Spectra of the 3,5-Diarylaminobenzene Derivatives

1986 ◽  
Vol 41 (11) ◽  
pp. 1311-1314 ◽  
Author(s):  
A. Balter ◽  
W. Nowak ◽  
P. Milart ◽  
J. Sepioł
Keyword(s):  
Excited State ◽  
Electronic Spectra ◽  
Fluorescence Properties ◽  
Steric Effects ◽  
Quantum Yields ◽  
Spectroscopic Behaviour ◽  
Fluorescence Quantum Yields ◽  
Excited State Lifetimes ◽  
Methyl Phenyl

Absorption and fluorescence properties, excited state lifetimes and fluorescence quantum yields were determined for a series of 3,5-diarylaminobenzene derivatives in solvents of different polarities. The role of the nitrile, methyl, phenyl and naphthyl substituents is discussed. Especially the steric effects on the spectroscopic behaviour of the investigated molecules are studied.

scholarly journals Mono- Versus Bicyclic Carbene Metal Amide Photoemitters: Which Design Leads to Best Performance?

2020 ◽  
Author(s):  
Florian Chotard ◽  
Vasily Sivchik ◽  
Mikko Linnolahti ◽  
Manfred Bochmann ◽  
Alexander Romanov
Keyword(s):  
Excited State ◽  
State Energy ◽  
Conformational Flexibility ◽  
Quantum Yields ◽  
Carbene Ligands ◽  
Lumo Energy ◽  
Excited State Energy ◽  
Excited State Lifetimes

New luminescent “carbene-metal-amide” (CMA) Cu, Ag and Au complexes based on monocyclic (C6) or bicyclic six-ring (BIC6) cyclic (alkyl)(amino)carbene ligands illustrates the effects of LUMO energy stabilization, conformational flexibility and excited state energy on the photoemission properties, leading to near-quantitative quantum yields, short excited state lifetimes Cu > Au > Ag down to 0.5 µs and high radiative rates of 10<sup>6</sup> s<sup>–1</sup>.

Direct measurements of excited-state lifetimes in Mg, Ca, and Sr†

1977 ◽  
Vol 67 (4) ◽  
pp. 488 ◽  
Author(s):  
M. D. Havey ◽  
L. C. Balling ◽  
J. J. Wright
Keyword(s):  
Excited State ◽  
Direct Measurements ◽  
Excited State Lifetimes

Excited state lifetimes and appearance potentials of benzene dimer and trimer

1989 ◽  
Vol 91 (11) ◽  
pp. 6743-6751 ◽  
Author(s):  
Hisanori Shinohara ◽  
Nobuyuki Nishi
Keyword(s):  
Excited State ◽  
Benzene Dimer ◽  
Excited State Lifetimes
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