The utility of Tb3+Mn4+Na4Mg(WO4)3 phosphors as ratiometric luminescent thermometers in the 200-450 K temperature range is demonstrated. Targeted substitution of Tb3+ for Na+ and Mn4+ for Mg2+ yields phosphors of formula Na4-12xTb4xMg1-2yMn y (WO4)3. UV excitation of the Na4Mg(WO4)3 host results in green emission from terbium (544 nm) and red…[Read more]

Teachers in developing countries are facing increasing social and political pressure to use Information and Communication Technologies (ICT) to improve the access to and the quality of education available to young people. This is a core part of several government-led initiatives to attain the United Nations Sustainable Development Goal 4-quality…[Read more]