CA-FSPCMs were constructed using a lightweight and high strength carbon aerogel to encapsulate PEG-6000, fabricated using biomass xanthan gum and polyimide.

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Uniform Al 2 O 3 :Eu 3+ samples were successfully fabricated via a hydrothermal method and subsequent thermal decomposition of Eu 3+ -doped precursors. The sample characterisations were carried out by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence spectra. XRD results revealed Eu 3+ -doped samples were a pure γ-Al 2 O 3 phase after being calcined at 1173 K. SEM results showed that these Eu 3+ -doped Al 2 O 3 samples were stalk-like, with an average length of 1.5 μm. Upon excitation at 394 nm, the orange-red emission bands, having wavelengths longer than 580 nm, were to be from 5 D 0 → 7 F J (J = 1, 2) transitions. The asymmetry ratio of ( 5 D 0 → 7 F 2 )/( 5 D 0 → 7 F 1 ) intensity is about 0.54, 2. 76, 3.29, 2.86, 3.36, 3.13 for Eu 3+ concentrations of 0.1, 0.4, 0.7, 1.0, 1.5 and 2.0 mol-%, respectively. The optimal doping concentration of Eu 3+ ions in Al 2 O 3 is 1.5 mol-%. According to Dexter's theory, the critical distance between Eu 3+ ions for energy transfer was determined to be 14 Å.

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