Rational molecular design of bipolar phenanthroimidazole derivatives to realize highly efficient non-doped deep blue electroluminescence with CIEy ˂ 0.06 and EQE approaching 6%
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Article number | 107982 |
Journal / Publication | Dyes and Pigments |
Volume | 173 |
Online published | 23 Oct 2019 |
Publication status | Published - Feb 2020 |
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Abstract
We report a series of novel phenanthroimidazole (PI) based bipolar deep blue-emitting compounds. The structure-property relationship is systematically studied. A star-shape steric group tetraphenylbenzene (TPB) is substituted to the C2 position of PI, which contributes to high-efficiency deep blue photoluminescence (PL) in solid state; while electron-withdrawing or donating groups are attached to the N1 position to realized tunable charge transfer character for high exciton utilization. Among all the emitters, the non-doped electroluminescent devices based on TPBPPI-PY and TPBPPI-PBI display superior EQE of 5.70% and 5.94% with color coordinates of (0.16, 0.049) and (0.16, 0.059), respectively. These performances are among the best deep blue OLEDs with CIEy < 0.06.
Citation Format(s)
Rational molecular design of bipolar phenanthroimidazole derivatives to realize highly efficient non-doped deep blue electroluminescence with CIEy ˂ 0.06 and EQE approaching 6%. / Zhu, Jie-Ji; Chen, Wen-Cheng; Yuan, Yi et al.
In: Dyes and Pigments, Vol. 173, 107982, 02.2020.
In: Dyes and Pigments, Vol. 173, 107982, 02.2020.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review