Non-Doped Deep-Blue OLEDs Based on Carbazole-π-Imidazole Derivatives
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In this work, we designed and synthesized four bipolar blue-emitting materials with carbazole, imidazole, and biphenyl as donor, acceptor, and p bridge, respectively. The twisted phenylimidazole acceptor leads to a wider band-gap and hence deeper blue emission than the conjugated phenanthrimidazole acceptor. For the substituents on the carbazole donor, the t-butyl group could prevent the intramolecular charge transfer (ICT) process more effectively than the methoxy group. A non-doped deep-blue organic light-emitting diodes (OLED) is obtained with CIE coordinates of (0.159, 0.080), a maximum luminance of 11364 cd/m2, and a maximum EQE of 4.43%.
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2018 ◽
Vol 30
(3)
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pp. 857-863
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2013 ◽
Vol 24
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pp. 2064-2071
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2008 ◽
Vol 8
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pp. 4607-4610
2006 ◽
Vol 16
(8)
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pp. 1057-1066
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