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Alkoxy chain regulated stimuli-responsive AIE luminogens based on tetraphenylethylene substituted phenanthroimidazole derivatives and non-doped OLEDs with negligible efficiency roll-off

Abstract

TThree novel tetraphenylethylene derivatives with different length of alkoxy chain, named TPEO1-PPI, TPEO4-PPI and TPEO6-PPI, are synthesized and fully characterized. All of them show obvious aggregation-induced emission (AIE) properties with high photoluminescence quantum yield (PLQY) in film state. The synthesized emitters exhibit green or blue emission in solid state, a significant blue-shift is observed in emission spectra upon increasing the length of alkoxy chains. Interestingly, all these compounds demonstrate mechanofluorochromic (MFC) properties with a significant red-shifted after mechanical grinding. X-ray diffraction results indicate that the MFC property can be attributed to morphological transition from crystalline to amorphous. Due to the high PLQY in film states and matched energy levels , the device based on TPEO4-PPI, showing outstanding maximun luminance (up to 15995 cd m−2 at 8.7 V), remarkable electroluminescence (EL) efficiencies (4.51 lm W−1 and 4.22 cd A−1) and maximum external quantum efficiency (EQE) of 4.07%. In addition, these devices show small efficiency roll-off, the corresponding EQE remained at 3.59% at a high luminance of 1000 cd m-2. These results indicate the length of the peripheral alkoxy chains connected to the terminal group can have great influence on the photophysical properties, which deserves attention in molecular design.

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Supplementary files

Article information


Submitted
27 Oct 2019
Accepted
02 Feb 2020
First published
03 Feb 2020

J. Mater. Chem. C, 2020, Accepted Manuscript
Article type
Paper

Alkoxy chain regulated stimuli-responsive AIE luminogens based on tetraphenylethylene substituted phenanthroimidazole derivatives and non-doped OLEDs with negligible efficiency roll-off

Z. Qiu, Z. Yang, W. Chen, L. Xing, S. Hu, S. Ji, Q. Yang, N. CAI, X. Ouyang and Y. Huo, J. Mater. Chem. C, 2020, Accepted Manuscript , DOI: 10.1039/C9TC05864H

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