Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 4, Issue 17, Pages 3699-3704Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc03737a
Keywords
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Funding
- Center of Innovation Program from Japan Science and Technology Agency, JST
- Japan Society for the Promotion of Science, JSPS KAKENHI Grant [26620202, 15J08167]
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To boost the performances of OLEDs, one of the most promising approaches from a materials chemistry viewpoint is the use of thin solid films with horizontal molecular orientations. In this work, we developed 2,2'-bipyridine-skeleton-based electron-transport materials (ETMs) end-capped with 3,5-dipyridylphenyl groups with the objective of preparing films with horizontal molecular orientations for use in high-performance organic light-emitting devices (OLEDs). These compounds afforded highly oriented films and were used in fac-tris(2-phenylpyridine)iridium(III)-based OLEDs as ETMs. The optimized device exhibited low operating voltages of 2.8 and 3.2 V at luminances of 100 and 1000 cd m(-2), respectively. At 1000 cd m(-2), this device exhibited a power efficiency of 74 lm W-1 and an external quantum efficiency of 21%.
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