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Improved High‐Brightness Efficiency of Phosphorescent Organic LEDs Comprising Emitter Molecules with Small Permanent Dipole Moments
Author(s) -
Reineke Sebastian,
Rosenow Thomas C.,
Lüssem Björn,
Leo Karl
Publication year - 2010
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201000529
Subject(s) - common emitter , phosphorescence , materials science , oled , dipole , brightness , annihilation , optoelectronics , molecule , transition dipole moment , photochemistry , phosphorescent organic light emitting diode , analytical chemistry (journal) , fluorescence , optics , nanotechnology , physics , chemistry , organic chemistry , layer (electronics) , quantum mechanics
Weaker triplet‐triplet annihilation (TTA) is observed in organic solid mixed systems comprising the phosphorescent emitter Ir(ppy) 2 (acac), which has a smaller dipole moment than the reference compound Ir(ppy) 3 . Spectral and time‐resolved analysis show that the weaker TTA can be explained by lower emitter aggregation, which reduces diffusion‐based TTA.