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Two new symmetric chromophores: 2, 8-bis-[(2-4′-ethoxy phenyl-5-4′-styryl)-1, 3, 4- oxadiazole] didibenzothiophene (abbreviated as SO-G1) and 2, 8-bis-[(2-4′-ethoxy phenyl-5-4′- styryl)-1, 3, 4-oxadiazole]-N-ethyl carbazole (abbreviated as NO-G1) have been synthesized and characterized. Both chromophores exhibit strong two-photon absorption (TPA) with the cross-sections of 2.99×10-48 and 3.48×10-48 cm4?s?photon-1 in THF and large up-conversion emission, when pumped by Ti:sapphire femto-second laser at 720 nm.
Two new symmetric chromophores: 2, 8-bis - [(2-4’-ethoxy phenyl-5-4’-styryl) -1,3,4- oxadiazole] didibenzothiophene (abbreviated as SO- Bis - [(2-4’-ethoxy phenyl-5-4’-styryl) -1,3,4-oxadiazole] -N-ethylcarbazole (abbreviated as NO-G1) have been synthesized and characterized. Both chromophores exhibit strong Two-photon absorption (TPA) with the cross-sections of 2.99 × 10-48 and 3.48 × 10-48 cm 4 · s · photon-1 in THF and large up-conversion emission, when pumped by Ti: sapphire femto-second laser at 720 nm.