nthesized as reported (Scheme 1) [12]. Electrospinning process: The solutions including 8 wt% PVP was prepared by dissolving PVP powder in ethanol at RT under magnetic stirring. The phase change luminescence materials samples were prepared by adding 17 wt% Eu-PEG powder to PVP solution with different molecular weights of PEG. These mixtures were separately stirred for 2 h. Electrospinning was performed at 20 1C in air and using a homemade apparatus. A spin dope was
filled in a 10 ml plastic syringe having a blunted stainless-steel needle with the inside diameter of 0.30 mm. The collector was placed at 18 cm below the tip of needle. During electrospinning, a positive high voltage of 16 kV was applied to the needle; and the solution feed rate of 3.0 ml/h was maintained using a syringe pump purchased from the Medical Instrument Co. (Hangzhou, China). The collected electrospun fibers