期刊
CERAMICS INTERNATIONAL
卷 45, 期 17, 页码 21709-21715出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.07.171
关键词
Charge-compensation; Photoluminescence; Phosphate; Eu3+; Sol-gel
资金
- South African Research Chairs Initiative of the Department of Science and Technology
- National Research Foundation of South Africa [84415, EQ P14080486021, 93214]
- rental pool programme of the National Laser Centre (NLC)
- University of the Free State
- Department of Science and Technology, India (Nano Mission) [DST/NM/NS/2018/38(G)]
This work focuses on the charge-compensation effects produced by different monovalent alkali ions, viz. Li+, Na+, K+, and the vacancy defects in the Eu3+-activated Ca3Mg3(PO4)(4) host. To compensate the extra charge produced due to doping of Eu-3(+) ions in the Ca2+ site, two approaches were adopted. In the first approach, a Ca2+ vacancy (square(+)) was deliberately created in such a way that three Ca2+ ions were removed for doping of every two Eu3+ ions. In the second case, a monovalent alkali ion (Li+, Na+ or K+) was incorporated along with one Eu(3+ )ion to replace two Ca2+ sites in the host. Sol-gel/Pechini method was employed for the synthesis. The luminescence emissions of Ca3Mg3(PO4)(4);Eu3+ phosphor significantly improved with the introduction of charge-compensators. The remarkable enhancement in the emission intensity of the charge-compensated samples was accompanied by noteworthy improvement in the color purity of their emissions.
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