Characterization of luminescent chromophore obtained from silica spheres |
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| Affiliation: | 1. Department of Physics, POSTECH, Pohang, South Korea;2. Pohang Accelerator Laboratory, POSTECH, Pohang, South Korea;3. Advanced Materials Research Lab, Department of Basic & Applied Sciences, Punjabi University, Patiala, Punjab, India;1. Department of Physics, ML Sukhadia University, Udaipur 313001, India;2. Department of Physics, College of Science, University of Tikrit, Tikrit, Iraq;3. Department of Physics, College of Education, University of Tikrit, Tikrit, Iraq;4. Department of Physics, Manipal University Jaipur, Jaipur 303007, India;5. Department of Pure and Applied Physics, University of Kota, Kota 324010, India;1. National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan;2. National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan;1. Physical and Life Sciences, Lawrence Livermore National Laboratory, PO Box 808, L-372, Livermore, CA 94551, United States;2. Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States;3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States;1. Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland;2. Faculty of Biological Sciences, University of Zielona Góra, Szafrana 1, 65-516 Zielona Góra, Poland;3. Institute of Molecular Physics, Polish Academy of Science, Smoluchowskiego 17, 60-179, Poznań, Poland;4. Joint Institute for Nuclear Research, 141 980 Dubna, Russian Federation |
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| 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 5.17 eV (240 nm). Field emission scanning electron microscope images show small cracks on the surface of aged spheres. The luminescence peak was at 2.81 eV (441 nm) for excitation energy between 3.88 and 3.35 eV and slightly shifted toward lower energy for excitation energy lower than 3.35 eV. The deconvoluted luminescent spectrum shows two emission bands at 3.08 and 2.74 eV, which are well-matched the oxygen deficient center model. Compared to the absorption peak (5.17 eV) and the emission peak (2.81 eV), large Stokes shift (2.36 eV) is observed. |
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| Keywords: | A. Optical materials A. Glasses B. Sol–gel growth C. Infrared spectroscopy D. luminescence |
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