High Efficiency Nondoped
Deep-Blue Organic Light Emitting
Devices Based on Imidazole-π-triphenylamine Derivatives
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Abstract
High-performance deep-blue emitting phenanthroimidazole
derivatives
with a structure of donor–linker–acceptor were designed
and synthesized. By using different linkers and different linking
positions, four deep-blue emitters were obtained and used as emitters
or bifunctional hole-transporting emitters in OLEDs. Such devices
show low turn-on voltages (as low as 2.8 V), high efficiency (2.63
cd/A, 2.53 lm/W, 3.08%), little efficiency roll-off at high current
densities, and stable deep-blue emissions with CIE<sub><i>y</i></sub> < 0.10. Performances are among the best comparing to recently
reported deep-blue emitting devices with similar structures. The results
suggest that the combination of the phenanthroimidazole and the donor–linker–acceptor
structure can be an important approach for developing high performance
deep-blue emitters in particular for lighting applications