Challenge in optoelectronic duplex switches: a red emission large-size single crystal and a unidirectional flexible thin film of a hybrid multifunctional material

Abstract

Photoelectric dual-function features in bulk crystals or flexible thin films make them excellent candidates for important and thriving applications in storage, sensing and other information fields. Based on superior advantages such as easy and environmentally friendly processing, mechanical flexibility, and ability to fabricate films and bulk single crystals; we designed a type of molecular material with a photoelectric multi-function switch, [N(NHCHCH)]MnCl (compound 1), which exhibits intriguing temperature-dependent dielectric and red emission switchable characteristics. This material perfectly explains the advantages of molecular materials, while 1 can also be used to fabricate a transparent unidirectional film with ultra-flexibility. Moreover, this material shows the highest record in signal contrast of ∼5 (exceeding all the known molecular materials/crystalline switches, revealing its potential to obtain high-efficiency signal-to-noise ratio), sensitive dielectric bi-stability, and excellent switching anti fatigue. These features give it a high application value in integrated circuits, optoelectronic seamless integration devices and flexible multifunctional devices.

Phosphorescent Manganese(II) Complexes and Their Emerging Applications

“…The interaction between organic cation and emissive anion in ionic manganese(II) complex is weak, and easily influenced by external stimuli (such as solvent, temperature, pressure, etc.). [24,32,41,48,49] So, the energy transfer from organic ligands or counterions to manganese(II) center is sensitive to solvent, temperature, and pressure, which makes them excellent candidates for stimuli-response-related applications.…”

“…The number of halogen atoms can be tuned from 4 to 6, and the halogen atoms attached to manganese(II) ion can also be the same or different. [22,[34][35][36]41] These features also make them more flexible in the molecular design. The photophysical properties of ionic manganese(II) complexes are closely related to the species of organic cation, halogen atom, and the coordination number.…”

“…These complexes also show intensive green phosphorescence with the decay time in microseconds ( Table 2). [26,34,41,49,53,[58][59][60][61][62][63][64][65][66][67][68]44] As shown in Figure 5, Kovalenko et al prepared three manganese(II) complexes (16a-c) bearing 1-benzyl-1-trimethylammonium cation (Bz(Me) 3 N + ) to show the trends in the emission properties. [44] The PL excitation spectra for these complexes are shown in Figure 5a-c.…”

“…At present, different from the noble metal-based phosphorescent materials, the research on phosphorescent manganese(II) complexes is just in its infancy but rapidly flourishing indeed, and their potential applications are also emerging in many areas. [22][23][24]41] The focus here will be mainly on the molecular design of new materials, mechanism of phosphorescence, photophysical properties, and their representative applications in organic electroluminescence, information recording and security protection, as well as temperature sensors. At last, we will present some perspectives and future research focus of this fascinating field.…”

High‐Temperature Reversible Phase‐Transition Behavior, Switchable Dielectric and Second Harmonic Generation Response of Two Homochiral Crown Ether Clathrates

“…heatinga nd cooling process. [1,2,18,[20][21][22][25][26][27][28][29][30][31][32] As shown in Figure 1a, 1 shows as ignificant phase transition, whichr evealing an endothermic/exothermic peak at 338.6/336.9 Ki nt he heating/cooling cycle mode, respectively.D ue to the steep peaks and an apparent thermalh ysteresis (1.7 K), we suppose that it is probablyafirst-order phase transition. Further calculate the entropyc hange (DS)i sa pproximately 6.544/6.321Jmol À1 K À1 , and the enthalpy change (DH)i sa bout 2192.2/2129.5 Jmol À1 , computed by meanso ft he formula DH = TDS,i nt he heating/ cooling processes, respectively.I na ddition, according to Boltz-mann equation DS = R lnN (R is the gasc onstant and N expressed as the ratio of possible orientations), where N1i s 2.197/2.139i nt he heating/cooling processes,r espectively (Supporting Information).…”