Nonlinear Optical Glass‐Ceramic From a New Polar Phase‐Transition Organic‐Inorganic Hybrid Crystal
De‐Xuan Liu, Haolin Zhu, Wei‐Xiong Zhang, Xiao‐Ming Chen
Abstract
Abstract Melt‐quenched glasses of organic–inorganic hybrid crystals, i.e., hybrid glasses, have attracted increasing attention as an emerging class of hybrid materials with beneficial processability and formability in the past years. Herein, we present a new hybrid crystal, (Ph 3 PEt) 3 [Ni(NCS) 5 ] ( 1 , Ph 3 PEt + =ethyl(triphenyl)phosphonium), crystallizing in a polar space group P 1 and exhibiting thermal‐induced reversible crystal‐liquid‐glass‐crystal transitions with relatively low melting temperature of 132 °C, glass‐transition temperature of 40 °C, and recrystallization on‐set temperature of 78 °C, respectively. Taking advantage of such mild conditions, we fabricated an unprecedented hybrid glass‐ceramic thin film, i.e., a thin glass uniformly embedding inner polar micro‐crystals, which exhibits a much enhanced intrinsic second‐order nonlinear optical effect, being ca . 25.6 and 3.1 times those of poly‐crystalline 1 and KH 2 PO 4 , respectively, without any poling treatments.