A New Nonlinear Optically Active Donor–Acceptor-Type Conjugated Polymer: Synthesis and Electrochemical and Optical Characterization

Abstract

A new donor-acceptor-type poly [3-{5-[3,4-didodecyloxy-5-(1,3,4-oxadiazol-2-yl)thiophen-2-yl]-1,3,4-oxadiazol-2-yl}-9-dodecyl-9H-carbazole] (P) has been synthesized through multistep reactions. The new polymer P exhibited good thermal stability and film-forming behavior. The electrochemical band gap is estimated to be 2.15 eV. The polymer emits intense green fluorescence in the solid state. Third-order nonlinear optical (NLO) studies showed that the strong absorptive nonlinearity observed for the polymer is of the optical limiting type, which is due to an ''effective'' three-photon absorption (3PA) process. This 3PA process can have potential applications in photonic devices. The studies revealed that the new polymer P is a promising material for development of efficient optoelectronic devices.

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

“…Several carbazole-containing copolymers ( 495 – 498 , Chart ) were also tested for NLO applications utilizing DFWM at 1064 nm. − The π-conjugated copolymers containing carbazole 495 , 496 , and 497 presented values of third-order NLO susceptibility of 8.6 × 10 –10 , 2.7 × 10 –13 , and 1.6 × 10 –13 esu, respectively. The value of the three-photon absorption coefficient for 498 was 2.1 × 10–25 m 3 W –2 .…”

“…The value of the three-photon absorption coefficient for 498 was 2.1 × 10–25 m 3 W –2 . As shown in Figure , polymer 498 showed good OPL behavior …”

“…Hollow circles show the experimental data, and the solid line gives the best fit with a three-photon absorption model. Reproduced with permission from ref . Copyright 2010 Springer Science and Business Media.…”

“…As shown in Figure 70, polymer 498 showed good OPL behavior. 1019 Poly(arylene ethynylenes) containing thiophene ring were synthesized, and the OL properties of these polymers were investigated with a Q-switched Nd:YAG laser producing 10 ns pulses at 532 nm. 1020 The experiments showed that the order of the OL response of the polymers is poly(3-hexyl-2,5thienyleneethylene) (P3) > poly(2,5-dihexyloxy-1,4-benzyleneethylene-3-hexyl-2,5-thienyleneethylene) (P2) > poly(9-hexyl-3,6-carbazoleethylene-3-hexyl-2,5-thienyleneethylene) (P1).…”