Figure 6 Applications of UPy-CDs in information encryption and
security.
Conclusions
In summary, a facile supramolecular strategy to prepare matrix-free RTP
CDs materials has been reported, which relies on the post-modification
of UPy recognition units to the surface of CDs. The strong hydrogen
bonding induced by surface UPy groups not only stabilizes the singlet
excited state, but also result in the efficient population of triplet
state. As a result, the after-glow emission can be easily observed by
the naked eye from UPy-CDs powder under ambient conditions, with a long
emission lifetime of 33.6 ms. On account of these combined attributes,
the potential application of UPy-CDs in information security was further
explored. To our best knowledge, the matrix-free RTP has rarely reported
for CDs and this work paves a new avenue for the rational design of CDs
based RTP materials that are suitable for scalable production.
Experimental