TY  - JOUR
A1  - Yang, C.
A1  - Vardeny, Z. V.
A1  - Köhler, Anna
A1  - Wohlgenannt, M.
A1  - Al-Suti, Mohammed K.
A1  - Khan, Muhammad S.
T1  - Spectroscopic study of spin-dependent exciton formation rates in pi-conjugated semiconductors : Comparison with electroluminescence techniques
N2  - It has been found in recent measurements that the singlet-to-triplet exciton ratio in organic light-emitting diodes (OLEDs) is larger than expected from spin degeneracy, and that singlet excitons form at a larger rate than triplets. We employed the technique of optically detected magnetic resonance to measure the spin-dependent exciton formation rates in films of a polymer and corresponding monomer, and explore the relation between the formation rates and the actual singlet-to-triplet ratio measured previously in OLEDs. We found that the spin-dependent exciton formation rates can indeed quantitatively explain the observed exciton yields, and that singlet formation rates and yields are significantly enhanced only in polymer OLEDs, but not in OLEDs made from the corresponding monomer
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Sandee, A. J.
A1  - Williams, Charlotte K.
A1  - Evans, N. R.
A1  - Davies, J. E.
A1  - Boothby, C. E.
A1  - Köhler, Anna
A1  - Friend, Richard H.
A1  - Holmes, Andrew B.
T1  - Solution-processible conjugated electrophosphorescent polymers
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Köhler, Anna
A1  - Beljonne, David
T1  - The singlet-triplet exchange energy in conjugated polymers
Y1  - 2004
SN  - 1616-3028
SN  - 1616-301X
ER  - 
TY  - JOUR
A1  - Khan, Muhammad S.
A1  - Al-Mandhary, Muna R. A.
A1  - Al-Suti, Mohammed K.
A1  - Al-Battashi, Fathiya R.
A1  - Al-Saadi, Sultan
A1  - Bjernemose, Jens K.
A1  - Mahon, Mary F.
A1  - Chawdhury, Nazia
A1  - Yonus, Muhammad
A1  - Köhler, Anna
A1  - Teat, Simon J.
A1  - Marseglia, Elizabeth A.
A1  - Tedesco, Emilio
A1  - Feeder, Neil
A1  - Ahrens, Birte
A1  - Raithby, Paul R.
T1  - Synthesis, characterisation and optical spectroscopy of platinum(II) di-ynes and poly-ynes incorporating condensed aromatic spacers in the backbone
Y1  - 2004
U6  - https://doi.org/10.1039/B405070C
SN  - 1477-9226
ER  - 
TY  - JOUR
A1  - Khan, Amena L. T.
A1  - Sreearunothai, Paiboon
A1  - Herz, Laura M.
A1  - Banach, Michael J.
A1  - Köhler, Anna
T1  - Morphology-dependent energy transfer within polyfluorene thin films
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Hayer, Anna
A1  - Köhler, Anna
A1  - Arisi, E.
A1  - Bergenti, I.
A1  - Dediu, A.
A1  - Taliani, C.
A1  - Al-Suti, Mohammed K.
A1  - Khan, Muhammad S.
T1  - Polymer light-emitting diodes with spin-polarised charge injection.
Y1  - 2004
SN  - 0379-6779
ER  -