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FIGURE 9 Linear absorption (left) and OPF (right) spectra of
PFStODO at film state (kex ¼ 360 nm). (a) Spin-coating of DCE
solution; (b) dipping of THF solution; and (c) dipping of DCE
solution.
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emission of transparent film under 365 nm UV light. The
shorter band is assigned to emission of pyrazoline chromo-
phore itself, whhereas the longer band might be caused by
formation of excimer in film.34–37 The quantum yield (QY)
and fluorescent lifetime of film are also measured according
to ref. 38; the QY of film is 1%, and the lifetime is 1.56 ns.
The shorter lifetime confirm the formation of excimer. Com-
pared with the XRD results, we considered that excimer for-
mation is probably due to the ordered aggregates of pyrazo-
line chromophore at the side chains.
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It is seldom reported that white-emission materials are
obtained only by adjusting molecular aggregates (Fig. 9).
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CONCLUSIONS
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In summary, a novel blue fluorescent monomer with pyrazo-
line segment was synthesized, and its star-shaped polymer
was obtained by ATRPs. The polymer emits strong blue fluo-
rescence at 465 nm with the fluorescence quantum yields
0.40. Moreover, polymer shows obvious two-photon fluores-
cence with the cross-section value of 203 GM, much higher
than that of monomer (13 GM). More interestingly, the film
of PFStODO can emit white-light due to the excimer forma-
tion caused by the chromophore aggregates. Although the
emission mechanism is still glancing, it might be a novel
approach for designing new white emission materials tuned
by molecule aggregates.
18 Qi, Y.; Li, N. J.; Xia, X. W.; Ge, J. F.; Lu, J. M.; Xu, Q. F.
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The authors gratefully thank Prof. Sun Baoquan for measure-
ment of the quantum yield and life time of luminescence. The
authors also thank Chinese Natural Science Foundation (Nos.
20876101, 200909044, and 21071105), major project of col-
lege and universities Jiangsu Province (08KJA430004), and a
project funded by the Priority Academic Program Development
of Jiangsu Higher Education Institutions.
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