Excimer formation from triplet-triplet annihilation reactions of the lowest-lying triplet excited state in aluminum(III), silicon(IV), and metal-free phthalocyanines: medium and magnetic field effects on the rate of reaction

1986 ◽  
Vol 90 (9) ◽  
pp. 1924-1927 ◽  
Author(s):  
M. E. Frink ◽  
D. K. Geiger ◽  
G. J. Ferraudi
Keyword(s):  
Magnetic Field ◽  
Excited State ◽  
Magnetic Field Effects ◽  
Triplet Excited State ◽  
Metal Free ◽  
Field Effects ◽  
Rate Of Reaction ◽  
Excimer Formation ◽  
Annihilation Reactions ◽  
Triplet Triplet Annihilation

Switch of the magnetic field effect on photon upconversion based on sensitized triplet–triplet annihilation

2016 ◽  
Vol 15 (12) ◽  
pp. 1462-1467 ◽  
Author(s):  
Hiroaki Yonemura ◽  
Yuji Naka ◽  
Mitsuhiko Nishino ◽  
Hiroshi Sakaguchi ◽  
Sunao Yamada
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Magnetic Field Effects ◽  
Field Effects ◽  
First Time ◽  
The Magnetic Field ◽  
Triplet Triplet Annihilation

Positive magnetic field effects on photon upconversion based on sensitized triplet–triplet annihilation are observed for the first time.

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.

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