I am planning to using Eu2+ as a dopant, as this one is usually found in the +3 state and usually gets oxidised from +2 to +3 for Phosphor materials. I usually found it to be more useful in the +2 state.
Dear Meiraba,
Eu3+ can be converted into Eu2+. Make sure you are heating your materials in the presence of Inert gas i.e reducing atmosphere. You can use charcoal box for this purpose. Keep your sample in crucible and place lid on it and keep in the charcoal box (Charcoal in Steel utensil can be used).
Eu2+ doped Oxides, Silicates, Borates are stable whereas Bromides, Iodides, Chlorides and Fluorides are unstable in air. In these compounds Eu2+ oxidised to Eu3+.
Dear Meiraba,
What told by Rupesh is correct.. Also please look for the annealing temperature also.It plays an important role for 3+ to 2+ conversion. as per my experience temp should be atleast 800 C for the materials having higher melting point..
You can even use graphite crucible for the reduction process.. It is also a good alternative..
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