期刊
RESULTS IN PHYSICS
卷 7, 期 -, 页码 3820-3825出版社
ELSEVIER
DOI: 10.1016/j.rinp.2017.09.057
关键词
Cobalt (II) doped zinc silicate; Transition metal; Sol-gel method; Nanophosphors; Photoluminescence
资金
- Malaysian Ministry of Education (MOE) under Fundamental Research Grant Scheme (FRGS)
- Ministry of Science, Technology and Innovation (MOSTI) under Science Fund
- Universiti Putra Malaysia (UPM) under Putra Grant
In this paper, undoped and cobalt (II) (3, and 5 mol %) doped zinc silicate nanophosphors prepared by a sol-gel method which were heated at 1000 degrees C were studied in detail. From the XRD result, undoped and Co2+ doped zinc silicate sample yields alpha- and beta-Zn2SiO4. This also shows that alpha-Zn2SiO4 acts as the primary phase in the crystal structure of the sample. For FESEM, the grain size decreases as the dopant increases where undoped sample indicates average grain size of 181 nm while 3 and 5 mol % exhibits containing ones 136.89 nm and 176.22 nm respectively. With FTIR transmission a major peak at range of 1100 cm(-1), 880, 550, and 350 assigning as Si-O-Si asymmetric stretching, SiO4 asymmetric stretching, ZnO4 symmetric stretching, and Si-O asymmetric deformation vibration were observed respectively. The absorption band of doped Zn2SiO4 exhibited a higher absorbance intensity in the UV region compared to undoped Zn2SiO4. Besides, all the samples depict that the sample was having a red shift in which the band shifted to the longer wavelength. The energy band gap value of undoped sample shows 3.07 eV and when Co2+ dopant (3 and 5 mol %) was introduced, the energy band gap started to decrease (2.46 and 2.42 eV respectively). PL emission presents two peaks at blue emissions (420 and 480 nm) and a green emission (525 nm). The result present that Co2+: Zn2SiO4 is potentially good to use as blue and green phosphors for luminescent optical material. (C) 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.
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