TP-COF

TP-COF with PDBA possesses a belt-like network, which is 300 nm wide and 100 nm thick. On excitation of the pyrene and triphenylene moieties, TP-COF exhibits blue luminescence. This is due to the fact that triphenylene has a non-localized excitation, but it can channelize the energy via the pyrene framework. That is why TP-COF may he utilized to generate energy in a wide region, from UV to visible, with the help of blue luminescence (Figure 10.19). 

The index (a, [>) relates to the distinct energy of each photon, respectively that is, oc = when both photons have the same excitation frequency T = damping factor. The parameter cof denotes the excitation energies of the final excited states /), the summation includes the ground state 0), and /) corresponds to the virtual state. Definition of the TP matrix element yields the theoretical TPA cross section <5tp if a linearly polarized radiation source is applied [16, 23], Eq. (20) ... 

A) Schematic representation of structure of (a) DTP-ANDI-COF and (b) DTP-AI rDI-COF. Dotted lines at the peripheiy indicate extended structure, (c) Center-to-center distance from a donor to acceptors in the COF. (d) A graphic view of a 3x3 porous framework. (B) Electronic absorption spectra of (left) DTP-ANDI-COF (green) and (right) DTPA-PyrDI-COF, simple mixture of their monomers (black), TP(OMe)6 (dotted blue), and NDI boronate aster (dotted red), I DI boronate ester (dotted red). For structure of TP(OMe)6, NDI boronate ester and PyrDI boronate ester. 

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