Details

Autor(en) / Beteiligte

• Jeong, Mi-Yun
• Cho, Bong Rae

Titel

Octupolar Molecules for Nonlinear Optics: From Molecular Design to Crystals and Films with Large Second-Harmonic Generation

Ist Teil von

• Chemical record, 2015-02, Vol.15 (1), p.132-142

Ort / Verlag

United States: Blackwell Publishing Ltd

Erscheinungsjahr

2015

Quelle

Wiley Online Library All Journals

Beschreibungen/Notizen

• We summarize the nonlinear optical (NLO) properties of octupolar molecules, crystals, and films developed in our laboratory. We present the design strategy, structure–property relationship, and second‐order NLO properties of 1,3,5‐trinitro‐ and 1,3,5‐tricyano‐2,4,6‐tris(p‐diethylaminostyryl)benzene (TTB) derivatives, TTB crystals, and films prepared by free‐casting TTB in poly(methyl methacrylate) (PMMA). The first hyperpolarizability of TTB was fivefold larger than that of the dipolar analogue. Moreover, the TTB crystal showed unprecedentedly large second‐harmonic generation (SHG). While TTB crystal films (20 wt% TTB/PMMA) on various substrates showed appreciable SHG values, the cylinder film exhibited much larger SHG values and large electro‐optic (EO) coefficients. The large SHG values and EO coefficients, as well as the high thermal stability of the cylinder film, will make it a potential candidate for NLO device applications. 1,3,5‐Tricyano‐2,4,6‐tris(p‐diethylaminostyryl)benzene (TTB) is a useful building block for octupolar nonlinear optical materials with large second‐harmonic generation (SHG) and electro‐optic coefficient. TTB exhibited a β(0) value of 252 × 10‐30 esu, while the TTB crystal showed unprecedentedly large SHG (||d||TTB = 1580 × 10‐9 esu at 1028 nm). The cylinder film of TTB in poly(methyl methacrylate) matrix on polyimide/indium tin oxide substrate exhibited large SHG, EO coefficients, and high thermal stability, which make it a potential candidate for NLO device applications.