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Exciton dynamics in blends of phosphorescent emitters
Author(s) -
Schütz Christoph,
Höfer Bianca,
Jaiser Frank,
Krueger Hartmut,
Thesen Manuel,
Janietz Silvia,
Köhler Anna
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200743441
Subject(s) - phosphorescence , exciton , common emitter , polymer , energy transfer , brightness , materials science , photochemistry , optoelectronics , molecule , covalent bond , steric effects , chemical physics , nanotechnology , fluorescence , chemistry , optics , physics , organic chemistry , quantum mechanics , composite material
Cascading energy transfer is a usually undesired effect in organic‐host guest systems that are designed for light‐emitting purposes. Here we demonstrate a chemical approach to suppressing undesired energy transfer from the blue to the red emitter in multicomponent polymer blends. We have combined a red, green and blue emitting Ir‐complex each with charge transporting molecules to a side‐chain copolymer. The covalent attachment of the phosphorescent emitter is found to prevent cascading energy transfer through steric shielding. This approach approximately doubles the efficiency and brightness of polymer light emitting diodes. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)