Broadband down-conversion through the co-contribution of simultaneous energy transfer from Eu3+/2+ to Yb3+ and CTS absorption of Yb3+

Molecular‐Like Ag Clusters and Eu3+ Co‐Sensitized Efficient Broadband Spectral Modification with Enhanced Yb3+ Emission

“…In the EuF 3 /YbF 3 co‐doped glass, a quantum cutting process may account for the energy transfer, as the Eu 3+ : 5 D 2 → 7 F 0 is located at approximately twice the energy of the Yb 3+ : 2 F 5/2 → 2 F 7/2 and there is no energy level higher than 2 F 5/2 for Yb 3+. In the AgNO 3 ‐involved glasses, the configuration coordinate diagram of the ML‐Ag clusters proposed by Tikhomirov et al was introduced . In the AgNO 3 /YbF 3 co‐doped glass, under UV‐visible excitation, the electronic transitions from the ground state of S 0 to the excited states of S 1 and T 2 may occur, as shown in Fig.…”

Transparent glass-ceramics functionalized with EuSiO3constrained BaF2:Eu2+nanocrystals: theoretical design and experimental fulfillment towards an efficient spectral converter

“…As illustrated in Scheme 1, as predicted from MD simulations, Eu 2+ can be reduced and enriched in fluoride nanocrystals, deriving from the fluoride sub-phase of the fluorosilicate matrix. Accordingly, we theoretically designed a series of BaF 2 -containing fluorosilicate glass-ceramics 3,4,[26][27][28][29][30] to stabilize divalent Eu 2+ via lattice site substitution. Then, the glass-ceramics containing EuSiO 3 constrained BaF 2 :Eu nano-structures simultaneously maintaining high visible optical transmittance were experimentally validated with high QY.…”

Stabilization of divalent Eu2+ in fluorosilicate glass-ceramics via lattice site substitution

“…It thus becomes crucial to keep divalent Eu 2+ as the majority. Generally, there are several ways to transform Eu 3+ into Eu 2+ : (i) adding reducing agents, [10][11][12] (ii) inputting reducing atmosphere during preparation processes, 13,14 (iii) adjusting optical basicity or electronegativity of host, 15,16 (iv) substituting M 2+ sites in crystalline lattices. 17,18 As strategies (i) and (ii) accompany drawbacks such as introducing impurities into the system or leading to infeasibility for elaborated optimization of concentration and distribution of Eu 2+ , strategies (iii) and (iv) are usually considered to be more executable.…”