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Experimental conditions for the sol-gel synthesis of TiO2 were modified by using Polyethylene glycol (PEG) as well as an addition of acid catalyst. Synthesis of brookite and mixed brookite with rutile was obtained. X-ray powder diffraction and Micro Raman measurements confirmed the crystallization of brookite while using pure PEG4000 with low molar acid concentration and a mixed brookite with rutile...
A series of emission-tunable Ca3SiO4Cl2:Bi3+, Li+, Eun+(n =2, 3) (CSC:Bi3+, Li+, Eun+) phosphors have been synthesized via sol-gel method. The X-ray diffraction results indicate that the as-synthesized phosphors crystallize in a low temperature phase with the space group of P21/c. Energy transfer from Bi3+ to Eu3+/Eu2+ exists in CSC:Bi3+, Li+, Eun+ phosphors. Under the excitation of 327 or 365nm,...
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