| http://www.w3.org/ns/prov#value | - In this case, in which level 3F4 is the first excited state, the quenching of luminescence when active ion concentration increases can not be due to cross-relaxation between various excited states, and it has been mainly considered as due to diffusion towards unidentified impurities (such as OH or other impurities present in the starting materials) [3434.
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