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- W2912785778 abstract "Abstract By introducing t-butyl- or methoxyl-containing oligocarbazole into the periphery of tris(mesityl-2-phenyl-1H-imidazole)iridium (III) [Ir (mpim)3], two novel imidazole-based Ir dendrimers tBu-D2-Ir (mpim)3 and MeO-D2-Ir (mpim)3 have been designed and synthesized through a convenient post-dendronization route. Due to the effective encapsulation, the intermolecular interactions and thus luminescence quenching in solid states is found to be gradually reduced following a sequence of Ir (mpim)3 > MeO-D2-Ir (mpim)3 > tBu-D2-Ir (mpim)3. Compared with the bare Ir (mpim)3 core (ΦPL = 0.38 and τ = 0.26 μs), accordingly, the film photoluminescence quantum yield and excited state lifetime are improved to 0.54 and 0.39 μs for MeO-D2-Ir (mpim)3 and 0.88 and 1.09 μs for tBu-D2-Ir (mpim)3. When these developed Ir dendrimers are adopted as the emitting layer alone, tBu-D2-Ir (mpim)3 achieves an excellent nondoped device performance, revealing a maximum current efficiency as high as 35.7 cd/A (13.2%, 37.4 lm/W) together with Commission Internationale del_Eclairage coordinates of (0.21, 0.45). Even at a high luminance of 1000, 5000 and 10000 cd/m2, it still remains to be 27.8, 24.7 and 21.8 cd/A, respectively, indicative of the gentle efficiency roll-off. The result clearly demonstrates the great potential of imidazole-based Ir dendrimers used for efficient nondoped phosphorescent organic light-emitting diodes." @default.
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- W2912785778 date "2019-05-01" @default.
- W2912785778 modified "2023-10-12" @default.
- W2912785778 title "Solution processible imidazole-based iridium dendrimers with oligocarbazole for nondoped phosphorescent OLEDs" @default.
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- W2912785778 doi "https://doi.org/10.1016/j.orgel.2019.02.017" @default.
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