Improved High-Brightness Efficiency of Phosphorescent Organic LEDs Comprising Emitter Molecules with Small Permanent Dipole Moments

Improved High-Brightness Efficiency of Phosphorescent Organic LEDs Comprising Emitter Molecules with Small Permanent Dipole Moments

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 em...

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Veröffentlicht in:Advanced materials (Weinheim) 2010-08, Vol.22 (29), p.3189-3193
Hauptverfasser: Reineke, Sebastian, Rosenow, Thomas C., Lüssem, Björn, Leo, Karl
Format: Artikel
Sprache:eng
Schlagworte:
Agglomeration
aggregation
Coordination Complexes - chemistry
dipole moment
Dipole moments
Efficiency
Emitters
high-brightness
Hydroxybutyrates - chemistry
Iridium - chemistry
Luminescent Agents - chemistry
OLEDs
Organic solids
Pentanones - chemistry
Phosphorescence
Pyridines - chemistry
Quantum Theory
roll-off
Spectral emittance
Thermodynamics
triplet-triplet annihilation
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Zusammenfassung: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.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201000529