Controllable white light generation from novel BaWO4: Yb3+/Ho3+/Tm3+ nanophosphor by modulating sensitizer ion concentration
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Generation of white light requires a proficient strategy for appropriate mixing of red, green and blue emissions in appropriate proportion through optimization of material composition. However, it is quite challenging to develop a single host material showing emission in full visible region, which can be excited by a single excitation source. Herein, a series of Yb3+-sensitized Ho3+/Tm3+ co-doped BaWO4 nanophosphors synthesized by hydrothermal method is reported. The effect of different concentration of sensitizer ion (Yb3+) on the luminescence properties of BaWO4:Yb3+/Ho3+/Tm3+ crystal is investigated in detail to obtain white light. The phosphors exhibited red, green and blue luminescence centered at 651 nm, 539 nm and 482 nm respectively under a 980 nm excitation. The obtained novel nanophosphor could be a major potential candidate for nanobiotechnology and optoelectronics device applications.
The authors gratefully acknowledge Principal Swami Shastrajnananda and Vice Principal Swami Ekachittananda of Ramakrishna Mission Vidyamandira for their infrastructural support and encouragement towards this project. We also thank Department of Science & Technology (DST) for financial support to this work. Technical assistance and a lot of help from Angshuman Santra, Soumyadip Mondal, Shymal Murmu and Rabiranjan Ray is also acknowledged.