A stretchable alternating current electroluminescent display seamlessly combines the light-emitting capabilities with mechanical compliance, which offers exciting opportunities for applications in wearable gadgets, soft robots, and fashion designs. The widespread adaption to deformable forms of optoelectronics is currently impeded by the tedious and labor-intensive fabrication process. This study reports an efficient and scalable procedure to create a fully screen-printed, multicolor, and stretchable electroluminescent display. The as-prepared device exhibits excellent deformability and low-voltage operation. The practical implementation is demonstrated by creating a wearable sound-synchronized sensing system with an epidermal display responsive to the rhythm of music. The ink formulation and printing procedure developed here pave the way for convenient fabrication of stretchable electronic devices.

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Phase equilibria of the quaternary systems (KCl + CaCl 2 + SrCl 2 + H 2 O) and (LiCl + NaCl + SrCl 2 + H 2 O) at 288.15 K and 0.1 MPa were studied using the isothermal dissolution method, and the phase diagrams of the two systems mentioned above were plotted. There are two invariant points and four crystallization regions in the quaternary system (KCl + CaCl 2 + SrCl 2 + H 2 O). Besides the crystallization regions of the minerals KCl, CaCl 2 •6H 2 O, and SrCl 2 •6H 2 O, the solid solution (Ca,Sr)Cl 2 •6H 2 O was found. The strontium and calcium salts can be separated from each other by avoiding crystallization in the solid solution region. There are two invariant points and four crystallization regions corresponding to NaCl, SrCl 2 • 6H 2 O, SrCl 2 •2H 2 O, and LiCl•2H 2 O in the quaternary system (LiCl + NaCl + SrCl 2 + H 2 O). Lithium chloride has a strong salting-out effect on NaCl and SrCl 2 •6H 2 O. The experiment results of the quaternary systems (KCl + CaCl 2 + SrCl 2 + H 2 O) and (LiCl + NaCl + SrCl 2 + H 2 O) have a significant value for separating and purifying minerals from the oilfield brine in the Nanyishan Section of the Qaidam Basin.

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Solid–liquid phase equilibria of the quaternary system (LiCl + MgCl2 + Li2SO4 + MgSO4 + H2O) at T = 288.15 K and p = 0.1 MPa were investigated using the isothermal dissolution equilibrium method, and a dry salt diagram and a water diagram were plotted accurately. The phase diagram of this quaternary system includes four invariant points, nine univariant solubility curves, and six crystallization regions corresponding to Li2SO4·H2O, LiCl·2H2O, LiCl·MgCl2·7H2O, MgCl2·6H2O, MgSO4·7H2O, and MgSO4·6H2O. The double salt of LiCl·MgCl2·7H2O was found, and no solid solution was formed. The Pitzer model and its extended Harvie-Møller-Weare (HMW) model were used for predicting the solubilities of the quaternary system (LiCl + MgCl2 + Li2SO4 + MgSO4 + H2O) at 288.15 K, and the predicted results agree well with the experimental values.