Journal
DYES AND PIGMENTS
Volume 180, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2020.108511
Keywords
phenanthro[9,10-d]imidazole; Deep blue materials; HLCT; OLEDs
Funding
- National Science Foundation of China [51603185, 51673174]
- Zhejiang Provincial Natural Science Foundation of China [LY19E030006, LQ19E030016, LZ17E030001]
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Based on novel phenanthro[9,10-d]imidazole (PI) chromophore, three deep-blue luminescent donor-acceptor molecules with different molecular configurations at the triphenylamine (TPA) core were designed and synthesized, the linear TPA-1PI, the V-shaped TPA-2PI and the star-shaped TPA-3PI. All three molecules displayed the hybridized local and charge-transfer (HLCT) excited state character, and highly efficient deep blue emissions were observed in their solution state, but only those of linear TPA-1PI and V-shaped TPA-2PI molecule were maintained in the solid state. Meanwhile, the V-shaped TPA-2PI and star-shaped TPA-3PI showed the much better thermal properties. Thus the molecular configurations of HLCT materials significantly influence their solid-state, and the V-shaped TPA-2PI molecule was highlighted because of its both deep-blue emission and good thermal stability. A double-layer device by using TPA-2PI as the emitter showed a highly efficient deep-blue electroluminescence with a very good CIE coordinate of (0.14, 0.08) and high current efficiency of 2.7 cd A(-1), which suggest that it might be a promising candidate for emission-layer materials for high-performance deep-blue OLEDs.
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