Abstract
Blue light emitting chromophores have been separated from silica spheres by soaking them into acetone for 120 days. The luminescent chromophores were not obtained from other solvents, including ether, methanol, ethanol, 2-propanol, chloroform and tetrahydrofuran. According to the Fourier transform infrared spectrum, the luminescent material is composed of C–OH, –CH2, –CH3, C=O, and Si–O–Si. UV–visible absorption peak of the chromophore is at 5.17eV (240nm). Field emission scanning electron microscope images show small cracks on the surface of aged spheres. The luminescence peak was at 2.81eV (441nm) for excitation energy between 3.88 and 3.35eV and slightly shifted toward lower energy for excitation energy lower than 3.35eV. The deconvoluted luminescent spectrum shows two emission bands at 3.08 and 2.74eV, which are well-matched the oxygen deficient center model. Compared to the absorption peak (5.17eV) and the emission peak (2.81eV), large Stokes shift (2.36eV) is observed.
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