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14 results on '"Lv, Xianhao"'

12. Aromatic Interlinking of M4L4Lantern Cages into Porous Films by Postsynthetic Electropolymerization

Author

Zhang, Jian, Zhang, Guoli, Zhang, Yuheng, Sun, Yan, Lu, Yao, Lv, Xianhao, and Qiu, Huibin

Abstract

We report the aromatic interlinking of metal–organic cages into porous films on conductive substrates through a postsynthetic electrochemical coupling pathway. A bidentate ligand decorated with an electroactive 9-phenyl-carbazolyl group is synthesized and subsequently coordinated with the paddlewheel clusters of Rh-, Cu-, and Ru-acetates to yield the [4 + 2] lantern cages. Multisweep cyclic voltammetry (CV) is applied to trigger the electropolymerization of these cages via dimerization of the peripheral carbazolyls, which leads to the in situ formation of uniform coatings on diverse current collectors (e.g., ITO glass, Ni foam, Au-decorated Si wafer) on demand. The thickness of the film can be finely tuned in a range of ca. 5–50 nm simply by varying the CV cycles. The resulting polycage products obtained after 10 CV cycles reveal a mesoporous structure with randomly distributed cavities with a diameter of ca. 15–35 nm. The porous films show electrical conductivity with a sheet resistance of as low as ca. 83 Ω on ITO glass and rapid ionic transfer kinetics with a low charge transfer resistance of ca. 40 Ω on Ni foam. These features prominently reduce the overpotentials and accelerate the catalytic kinetics in electrocatalytic water splitting compared to the blenders of the cage monomer and Nafion binder.

Published
2024
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14. A simple D–π–A hybrid mode for highly efficient non-doped true blue OLEDs with CIEy ＜ 0.05 and EQE up to 6%.

Author

Shi, Jinjin, Ding, Qi, Xu, Lei, Lv, Xianhao, Liu, Zhongwei, Sun, Qikun, Pan, Yuyu, Xue, Shanfeng, and Yang, Wenjun

Abstract

Although great advances have been achieved in organic electroluminescence fields, highly efficient true blue organic electroluminescence with small CIE coordinates and satisfactory color purity are still limited. Here, we practise a simple and effective molecular avenue for true blue organic electroluminescence, and the strategy is to use biphenyl-bridging hybrids of 1,2,4-triazoles (acceptors) and various donors (D) as the emitters. The as-prepared D–π–A hybrid (TPATZ) containing 2,3,4-triphenyl-1,2,4-triazole and triphenylamine emits bright blue light both in solution and in the solid state, and the non-doped device with TPATZ as an emitter exhibits true blue electroluminescence (EL) with the emission peak at 430 nm and the Commission Internationale de L’Eclairage coordinates of (0.155, 0.047). Moreover, the satisfactory EL color purity with the full width at half maximum (FWHM) of only 50 nm and the maximum external quantum efficiency of 5.92% is obtained, which is among the best true blue OLEDs reported to date. These impressive EL properties are experimentally and theoretically analyzed and emphasize that this simple D–π–A hybrid mode is an effective molecular strategy for highly efficient true blue EL emitters. [ABSTRACT FROM AUTHOR]

Published
2018
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