Journal
CHEMISTRY OF MATERIALS
Volume 24, Issue 1, Pages 61-70Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm201789u
Keywords
high efficiency; nondoped; deep-blue organic light emitting devices
Funding
- Research Grants Council of the Hong Kong Special Administrative Region, China [CityU 101508]
- National Natural Science Foundation of China [91027041]
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, TIPC, CAS
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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 CIEy < 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.
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