Materials: PEG ( Mn¼2000, 6000, 10,

Materials: PEG ( Mn¼2000, 6000, 10,000, 20,000) was obtained from Beijing Chemical Reagent Co. Inc., China. Eu2O3 (99.9%) was obtained from J&K Scienti
fi c Ltd. Terephthaloyl chloride (TPC) and Poly (vinyl pyrrolidone) (PVP, Mw¼1,300,000 g mol1) were pur- chased from Aldrich. All chemicals were used without further puri
fi cation. Eu-PEG phase change luminescence materials were synthesized 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

were dried in vacuum at the room temperature for 24 h to remove residual solvent. Characterization: An S-4300 SEM was employed to examine morphologies of the composite
fibers at an acceleration voltage of 20 kV under low vacuum. Before SEM examination, all specimens were gold-coated to avoid charge accumulations. The purity of the products was examined by a Bruker XFlash 5030 energy dispersive X-ray spectrometer (EDX). The thermal analysis of electrospun
fibrous mats was done using a differential scanning calorimeter (DSC131, Setaram Instrumentation, France) with a heating rate of 10 1C/min ranging from 0 to 100 1C, in a nitrogen atmosphere. Excitation and emission spectra were recorded using an F-7000 spectrophotometer equipped with a 150 W xenon lamp as excitation source.