Dy3+-doped zinc fluorophosphate glasses for white luminescence applications
| Autor: | C.K. Jayasankar, K. Upendra Kumar, N. Vijaya |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Differential Thermal Analysis
Luminescence Optical Phenomena Static Electricity Analytical chemistry chemistry.chemical_element Zinc Absorption Phosphates Analytical Chemistry Ion Fluorides Dysprosium Instrumentation Spectroscopy Spectroscopy Near-Infrared Chemistry Doping Acceptor Atomic and Molecular Physics and Optics Kinetics Spectrometry Fluorescence Energy Transfer Excited state Thermodynamics Spectrophotometry Ultraviolet Glass Ground state |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 113:145-153 |
| ISSN: | 1386-1425 |
| DOI: | 10.1016/j.saa.2013.04.036 |
| Popis: | Dysprosium (Dy 3+ ) ions doped zinc fluorophosphate (PKAZLFDy: P 2 O 5 –K 2 O–Al 2 O 3 –ZnF 2 –LiF–Dy 2 O 3 ) glasses have been prepared and investigated their spectroscopic properties using absorption, emission and decay measurements. Judd–Ofelt analysis has been carried out to obtain the intensity parameters and in turn predicted radiative properties for the 4 F 9/2 level of 1.0 mol% of Dy 2 O 3 doped glass. Visible luminescence spectra have been obtained due to 4 F 9/2 → 6 H J ( J = 11/2, 13/2, 15/2) transitions of Dy 3+ ions under 385 nm excitation. The yellow-to-blue luminescence intensity ratios and chromaticity coordinates of Dy 3+ ions in these glasses have been analyzed as a function of Dy 3+ ion concentration. The decay profiles for the 4 F 9/2 level exhibit perfectly single exponential at lower concentrations (up to 1.0 mol%) and turn into non-exponential for higher concentrations (>1.0 mol%) due to energy transfer between donor (excited state Dy 3+ ion) and acceptor (ground state Dy 3+ ion). The results reveal that these glasses emit bright white light which is suitable for the development of W-LEDs. |
| Databáze: | OpenAIRE |
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