Eu³⁺-Doped glass ceramics containing NaTbF₄ nanocrystals: controllable glass crystallization, Tb³⁺-bridged energy transfer and tunable luminescence

Abstract

The ET chains of (a) Tb³⁺ → (Tb³⁺)_n → Q and (b) Tb³⁺ → (Tb³⁺)_n → Eu³⁺. (c) The energy levels of Tb³⁺ and Eu³⁺ ions, the related radiative transitions and the possible ET routes. (d) Main luminescent transitions of Tb³⁺ and Eu³⁺ in the visible wavelength range.