10.1002/chem.201802201
Chemistry - A European Journal
FULL PAPER
concentration of 1×10-5 mol/L. Then, 5 μL of prepared dispersion were
dropped in cryo TEM grid and freezing immediately as the cryo-TEM
samples. After several days, the crystals generated from suspensions of
THF/H2O mixtures with fw of 80% were used as TEM samples.
Solid state display and data encryption: Firstly, the ink based on DBF,
TPE or DBBT-C8 with a concentration of ~2 mg/mL in dichloromethane
was prepared. Then, the seal containing the logo of “XI’AN JIAOTONG
UNIVERSITY” was constructed and then dipped into the prepared ink.
After that, the logo can be printed in the different paper to afford the
application of solid state display and data encryption.
X-ray crystallography for DBBT-C0: C18H12N2S, MW= 288.36, T/K=
100.01(10), a/Å= 9.5322(6), b/Å= 11.9854(9), c/Å= 13.8700(10), α/°=
109.931(7), β/°= 94.006(6), γ/°= 112.019(7), V/Å3= 1345.04(18), Z= 4,
ρcalcg/cm3= 1.424, μ/mm-1= 2.064, F(000)= 600.0, independent reflections
4782 (Rint= 0.0328, Rsigma= 0.0418), GOF on F2=1.028, R1 = 0.048, wR2 =
0.1237 (all data). These data can be obtained free of charge by The
Cambridge Crystallographic Data Centre.
Figure 7. Printed photographs using ACQ (DBF, a), AIE (TPE, b) and SIEE
(DBBT-C8, c) molecules under UV light; Photographic images in data
encryption: Encrypted data (d); Photographs under naked eyes (e);
Photographs under UV light (f).
Acknowledgements
Conclusions
Thanks to the financial supports from the National Natural
Science Foundation of China (21674085, 51603165 and
21474079), the Program for New Century Excellent Talents in
University (NCET-13-0453).
In summary, all these SIEE constructed OLMs exhibited much
impressive emission efficiency with quantum yields up to 90% in
well-dissolved solution states. Also, benefiting from their twisted
molecular backbones and isolated proper alkyl chains, high Φ
values of 71.39% and 77.46% were also observed for DBBT-C4
and DBBT-C8 in their aggregated solid states, indicating that
highly emissive dual-state emission in DBBT-C4 and DBBT-C8
can be successfully achieved through the SIEE strategy. Finally,
the resulted emissive DBBT-C8 was also applied in the solid
state display and data encryption.
Keywords: Self-Isolated Enhanced Emission • Dual-State
Emission • Organic Luminescent Materials • Aggregation-
Caused Quenching • Aggregation-Induced Emission
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