The magnitude and dynamic response of the third-order optical nonlinearities of squarylium and croconium dyes in
methanol solution were measured by femtosecond degenerate four-wave mixing (DFWM) technique at 800 nm.
Ultrafast nonlinear optical responses have been observed, and the magnitude of the second-order hyperpolarizabilities
was evaluated to be 5.80 × 10-31 esu for the squarylium dye and 8.69 × 10-31 esu for the croconium dye, respectively.
The large optical nonlinearities of the dyes can be attributed to their rigid and intramolecular charge transfer structure,
and the instantaneous NLO responses of dyes are shorter than the experimental time resolution (50 fs), which is mainly
contributed from the electron delocalization. The fast nonlinear response and large third-order optical nonlinearities
show that the studied squarylium and croconium dyes might a kind of promising materials for the applications in
all-optical switching and modulator.
Photodynamic diagnosis (PDD) is of increasing interest for diagnosis in oncology. It is based on the selective
accumulation of photosensitizers in tumours, such as porphyrin and phthalocyanine. In the present study, novel
dihydroxy phosphorus tetrabenzotriazacorrole derivates have been synthesized. And photophysical properties of these
derivates have been studied. Dihydroxy phosphorus tetrabenzotriazacorrole derivates display a fluorescence which is
from the higher S2 electronic state. With excitation at 614 nm, the fluorescence maximum is at 668 nm for dihydroxy
phosphorus(V)-2,9,16,23-tetranitrotetrabenzotriazacorrole {P(OH)2TBC(NO2)4} in N,N-dimethylformamide (DMF). But
with excitation at 310 nm for P(OH)2TBC(NO2)4 in DMF, in addition to S1 fluorescence a new fluorescence peak
appears at 490 nm, which is attributed to S2-state fluorescence. It indicates that the dihydroxy phosphorus
tetrabenzotriazacorrole derivates might have a potential application as a dual fluorescent marker for photodynamic
diagnosis.
Phthalocyanine materials have successfully been applied in infrared ray optical disc systems. Seeking for the phthalocyanine-analogous materials with great conjugate macrocyclic π bond system is the key for new materials research of super high density blue laser optical storage. Dibenzotetraaza [14] annulene have the similar macrocyclic structure. It was used as a building block for the preparation of multi-component materials matched the requirement of recordable blue laser optical disc. Ester substituents have been generated with oxalyl dichloride (or phosgene) and appropriate HO-function-containing substrates. A range of new complexes equipped with ester groups derived from various alcohols and phenols have been prepared. The new products have been characterized by UV-Vis spectrometer, TGA, refractive index of the organic films. These kinds of materials have suitable light and thermal sensitivity, and it is a valuable material for blue laser optical storage.
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