A lead bromide organic–inorganic hybrid perovskite material showing reversible dual phase transition and robust SHG switching

Abstract

An one-dimensional organic-inorganic hybrid perovskite material [3.3.0-dabco]PbBr3 (1) was synthesized by reaction of 1,5-diazabicyclo[3.3.0]octane (3.3.0-dabco) with PbBr2 in concentrated HBr aqueous solution. The differential scanning calorimetry, dielectric measurements, and variable-temperature...

Revisiting two thiophosphate compounds constituting d0transition metal HfP2S6and d10transition metal α-Ag4P2S6as multifunctional materials for combining second harmonic generation response and photocurrent response

“…The phase transition from acentric α-Ag 4 P 2 S 6 to centrosymmetric β-Ag 4 P 2 S 6 upon heating is related to a group of emerging functional materials called optical switch. 72–89 In recent years, the optical switch has emerged as a new and important research direction. 72–89 Fig.…”

Three-Dimensional Perovskite Phase Transition Materials with Switchable Second Harmonic Generation Properties Introduced by Homochiral (1S,4S)-2,5-Diazabicyclo[2.2.1]-heptane

“…When subjected to external stimuli (such as temperature, stress, etc. ), the kinetic state of the A cation will change, resulting in various switchable properties, such as phase transition, dielectricity, and second harmonic generation (SHG) effect. − …”

“…Furthermore, the introduction of quasi-spherical molecules makes the crystal have asymmetry and dipole moment, which makes it easier to generate an SHG response. , In recent years, the quasi-spherical molecules such as 1,4-diazabicyclo[2.2.2]­octane, 1,5-diazabicyclo[3.2.1]­octane, 1,4-diazabicyclo[3.2.2]­nonane, and 1,5-diazabicyclo[3.2.2]­nonane have been widely used to synthesize multifunctional compounds with reversible phase transition, dielectric, SHG effects, and ferroelectric properties. ,,, This is because the quasi-spherical molecules are easy to rotate at high temperatures and disorderly form spherical structures, while they are in an ordered state at low temperatures. Therefore, the introduction of the quasi-spherical structure provides the possibility to enrich the phase transition and frequency doubling materials. ,, …”

“…Therefore, the introduction of the quasi-spherical structure provides the possibility to enrich the phase transition and frequency doubling materials. 23,55,56 In view of these, in order to design more environmentally friendly materials with SHG response switches, we put a quasispherical and chiral molecule 1S,4S-2,5-diazabicyclo[2.2.1]heptane (1S,4S-2,5-2.2.1-H 2 dabch) into the 3D rubidium halide inorganic framework. As predicted, the obtained three 3D perovskite crystals [1S,4S-2,5-2.2.1-H 2 dabch]RbX 3 •0.5H 2 O (X = Cl, 1; Br, 2; I, 3) all crystallized in the chiral space group P2 1 2 1 2 1 , showing reversible SHG response and dielectric abnormal behavior.…”

Efficient second-order nonlinear response and upconversion emission from a wide-bandgap quasi-1D lead bromide perovskite

“…Nonlinear optical (NLO) materials are essential for the development of advanced modern technologies such as all-optical modulation, [17][18][19] optical communication, [20][21][22] and quantum information processes. 23,24 To date, the linear electro-optic effect (Pockels effect), 25 the photogalvanic effect, 26,27 second harmonic generation (SHG) 28,29 as well as ferroelectric effects 30,31 have been observed in halide perovskites. Due to structure confinement, lowdimensional perovskites exhibit distinctive band structures compared with their 3D counterparts.…”