Synthesis of second order nonlinear optical multichromophore based on double-donors with enhanced electro-optic coefficients and thermal stability

Our work was related to the systhesis of several nonlinear optical dendrimers L1-L3 with identical Bis(N,Ndiethyl)aniline-derived donor bridge and phenyl-trifluoromethyl-tricyanofuran acceptor. The dendritic structure of multichromophores can effectively reduce the electrostatic interaction between chromophores. And the strong acceptor result in large first-order hyperpolarizability of the chromophores. Multichromophores L2-L3 showed very high poling efficiencies due to large steric hindrance and first-order hyperpolarizability value of chromophores. A large poling efficiency (2.10 +/- 0.08 nm2/V2) and r33 (205 p.m./V) have been achieved for neat chromophore L3 thin films at 1310 nm. Besides, the glass transition temperature (Tg) of L2 and L3 has greatly improved to 125 degrees C and 133 degrees C, respectively. All of these provided an new insights into molecular design of chromophore with enchanced poling efficiency and high thermal stability.

Automated summary

In this study, the synthesis of nonlinear optical dendrimers with multichromophores was investigated. It was found that the dendritic structure, along with the identical donor bridge and strong acceptor, significantly improved the poling efficiency and thermal stability of the chromophores.