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Enhancing Phosphorescence and Electrophosphorescence Efficiency of Cyclometalated Pt(II) Compounds with Triarylboron
Author(s) -
Hudson Zachary M.,
Sun Christina,
Helander Michael G.,
Amarne Hazem,
Lu ZhengHong,
Wang Suning
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201090093
Subject(s) - phosphorescence , materials science , quantum efficiency , photochemistry , chromophore , steric effects , phosphorescent organic light emitting diode , common emitter , platinum , quantum yield , optoelectronics , fluorescence , catalysis , chemistry , organic chemistry , optics , physics
A synthetic strategy for the preparation of cyclometalated platinum(II) acetylacetonate (acac) complexes functionalized with triarylboron is achieved. This method is used to synthesize a series of triarylboron‐functionalized phosphorescent Pt(acac) compounds, which are characterized by NMR spectroscopy, X‐ray crystallography, and theoretical calculations. These complexes exhibit a range of bright phosphorescent colors spanning the green to red region of the visible spectrum ( λ max = ∼520–650 nm) in solution and the solid state. Functionalization with a triarylboron group leads to significant enhancement in quantum yield for several of these complexes relative to the non‐borylated Pt(II) parent chromophores, which may be attributed to the increased mixing of 1 MLCT and 3 LC states. The phosphorescent enhancement, electron transport capabilities, and steric bulkiness offered by the triarylboron group can be used to significantly enhance the performance of electrophosphorescent devices based on Pt(II) emitters. A high efficiency green electrophosphorescent device is fabricated with a maximum external quantum efficiency of 8.9%, luminance efficiency of 34.5 cd A −1 , and power efficiency of 29.8 lm W −1 , giving significantly improved performance over control devices in which the Pt(II) emitter lacks the boron functionality.