Optical absorption and photoluminescence studies of Dy3+ doped alkaline earth bismuth borate glasses
| Autor: | M. Veeramohan Rao, B. Shanmugavelu, V.V. Ravi Kanth Kumar |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Alkaline earth metal Photoluminescence Materials science Absorption spectroscopy business.industry Doping Biophysics Analytical chemistry 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics Ion Optics Excited state 0103 physical sciences Emission spectrum 0210 nano-technology Absorption (electromagnetic radiation) business |
| Zdroj: | Journal of Luminescence. 181:291-298 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2016.09.012 |
| Popis: | Dy 3+ doped alkaline earth bismuth borate glasses were prepared by the conventional melt-quenching method. The prepared glasses were characterized by absorption, excitation, emission and decay curves. Judd–Ofelt parameters were obtained from the absorption spectra recorded at 400–2000 nm. All the samples were excited at different wavelengths from UV (350 nm) to blue (450--470 nm) light and respective emission spectra are recorded. The intensity ratio of yellow to blue (Y/B) indicates that Dy 3+ ions are present in low symmetry site. B 2 O 3 –Bi 2 O 3 RO (R = Ba, Sr & Ca) glasses emit efficient white light under different excitation wavelengths, which match well with the emission of commercial GaN-based blue LEDs and InGaN-based LEDs respectively. CIE coordinates were calculated from the emission spectra and found that they fall in white light region. Decay curves show single exponential nature up to 1 mol% of Dy 3+ concentrations and then turn into non-exponential for 2 mol% of Dy 3+ ions. Lifetime of these glasses decreases with increase of Dy 3+ ion concentration. |
| Databáze: | OpenAIRE |
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