TY - JOUR
T1 - Polymer interfaces studied by photoelectron spectroscopy
T2 - The Asia-Pacific Symposium on Organic Electroluminescent Materials and Devices
AU - Greczynski, G.
AU - Fahlman, M.
AU - Salaneck, W. R.
AU - Johansson, N.
AU - Dos Santos, D. A.
AU - Brédas, J. L.
N1 - Funding Information:
The polymer material was supplied by C. Murphy, Cambridge Display Technology, UK. This work was supported by the European Commission through the BRlTE/URAM program OSCA (project number 4438). Research on condensed molecular solids and polymers in Linköping is supported in general by grants from the Swedish Natural Science Research Council (NFR), the Swedish Research Council for Engineering Sciences (TFR), the Carl Tryggers Foundation, and the European Commission for the TMR network SISITOMAS (project number 0261). Research on conjugated materials in Mons is supported by the Belgian Federal Government (Pôle d'Attraction Interuniversitaire en Chimie Supramoleculaire et Catalyse) and FNRS/FRFC. In addition to OSCA, the Mons-Linköping collaboration is supported by the European Commission through the TMR program (project number 1354 SELOA).
PY - 2000/3/1
Y1 - 2000/3/1
N2 - The behavior of lithium atoms deposited on the surfaces of ultra-thin spin-coated films of poly(dioctylfluorene), and of condensed molecular solid films of tris(8-hydroxyquinoline) aluminum, have been studied through a combined experimental-theoretical approach. The Li-atoms donate charges to the organic systems, leading to doping-induced electronic states in the otherwise forbidden energy gap. The changes in the electronic structure induced by charge transfer from the Li-atoms are different in the two materials studied, and depend upon the localization of the electronic states to which the electrons are transferred. In the case of the delocalized wave functions of the π-system of poly(dioctylfluorene), at low doping levels, the added charges lead to the formation of polaron states, while at higher doping concentrations, bipolaron states are formed. In the case of the tris(8-hydroxyquinoline) aluminum, however, up to a level of three added electrons per molecule, the added electrons reside in states localized on each of the three ligands.
AB - The behavior of lithium atoms deposited on the surfaces of ultra-thin spin-coated films of poly(dioctylfluorene), and of condensed molecular solid films of tris(8-hydroxyquinoline) aluminum, have been studied through a combined experimental-theoretical approach. The Li-atoms donate charges to the organic systems, leading to doping-induced electronic states in the otherwise forbidden energy gap. The changes in the electronic structure induced by charge transfer from the Li-atoms are different in the two materials studied, and depend upon the localization of the electronic states to which the electrons are transferred. In the case of the delocalized wave functions of the π-system of poly(dioctylfluorene), at low doping levels, the added charges lead to the formation of polaron states, while at higher doping concentrations, bipolaron states are formed. In the case of the tris(8-hydroxyquinoline) aluminum, however, up to a level of three added electrons per molecule, the added electrons reside in states localized on each of the three ligands.
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U2 - 10.1016/S0040-6090(99)01007-X
DO - 10.1016/S0040-6090(99)01007-X
M3 - Conference article
AN - SCOPUS:0033899612
VL - 363
SP - 322
EP - 326
JO - Thin Solid Films
JF - Thin Solid Films
SN - 0040-6090
IS - 1
Y2 - 8 June 1999 through 11 June 1999
ER -