Thermally-driven unusual dual SHG switching with wide SHG-active steps triggered by inverse symmetry breaking

Abstract

Solid nonlinear optical (NLO) materials with switchable second-harmonic generation (SHG) on/off state show a strong potential application in photo-electronic devices. Sustained progress has been made through the persistent exploration of...

Reversible Phase Transition and Second-Harmonic Response Based on a Zero-Dimensional Organic–Inorganic Hybrid Compound

“…Meanwhile, in previously reported phase change materials, organic ammonium cations fill in poles created by the inorganic framework, such as [NH 4 ]­[M­(HCOO) 3 ] and [C 6 H 14 N] 2 PbBr 4 . Therefore, by introducing new organic and inorganic frameworks, OIHMs with more new attractive properties could be obtained. − …”

New Room-Temperature Molecular Ferroelectric (C6H16N2O)CdBr4·H2O with Preferable Luminescent Properties

“…Since the SHG signal is very sensitive to the change in the symmetry, this phenomenon indicates that the crystal structure changes from a non-centrosymmetric phase to a centrosymmetric phase during the heating process. 45,46 In addition, the space group of the crystal at room temperature is Pca2 1 , which belongs to the 68 species polar space groups, indicating the inevitable pyroelectricity and potential ferroelectricity of AEM-CdBr 4 . For the first-order phase transition of intrinsic ferroelectric, the order parameter of spontaneous polarization is discontinuous.…”

Nonlinear Optical Glass‐Ceramic From a New Polar Phase‐Transition Organic‐Inorganic Hybrid Crystal

“…The long‐term challenges facing traditional SHG crystals include a high energy‐consuming production process in growing large‐enough single crystals as well as the subsequent difficulty in crystal cuttings or thin‐film fabrication for the inorganic materials, or a poor mechanical strength as well as a low thermal stability for the organic materials [3] . The demands on flexible, easy manufacturing, and highly designable materials have promoted the development of organic–inorganic hybrid crystals, which provide an emerging and promising platform to explore new SHG materials [4–10] …”

“…[3] The demands on flexible, easy manufacturing, and highly designable materials have promoted the development of organic-inorganic hybrid crystals, which provide an emerging and promising platform to explore new SHG materials. [4][5][6][7][8][9][10] The past decade has witnessed the emergence of systematic studies on solid-liquid transitions in hybrid crystals, which provide a novel approach to shape materials with beneficial processability and formability for practical applications. [11][12][13][14] In particular, some hybrid crystals have been proved to form melt-quenched glasses, i.e., hybrid glasses, [15][16][17][18][19][20][21] whose mechanical properties and working temperatures are associated with inner coordination bonds and intermolecular interactions and thus in principle can be tuned by rationally choosing diverse molecular components.…”