Eu3+ Luminescence in Disilicates (Y, Tb)2Si2O7

Abstract

The luminescence properties of Eu3+‐activated disilicates (Y, Tb)2Si2O7 are strongly influenced by their crystal structure. Within the region of type C in cathodoluminescence an energy transfer from the hole trap Tb3+ to the electron trap Eu3+ is working due to the crystallographic equivalence of the Ln3+ surroundings. However, in disilicates of type B with four inequivalent Ln3+ positions and additionally large variations in the shape of the coordination polyhedra the energy transfer is blocked, resulting in a strong reduction of the efficiency. The mechanisms of energy transfer are discussed.

Synthesis, Thermal Evolution, and Luminescence Properties of Yttrium Disilicate Host Matrix

“…%) have been investigated. The results indicate that for similar Dy concentrations, the luminescence efficiency is higher in the β-Y 2 Si 2 O 7 than it is in the α-Y 2 Si 2 O 7 phase, in good concordance with previous reports on yttrium silicates doped with RE elements. , Differences in luminescence efficiency must be ascribed to quenching effects resulting from Dy−Dy interactions. The α-phase is characterized by the existence of four crystallographically nonequivalent Y 3+ positions with strong variations in the shape of the coordination polyhedra.…”

“…In particular, these materials exhibit an adequate behavior for luminescent applications as plasma displays, laser materials, and high-energy phosphors when doped with rare-earth elements. The luminescence of these phosphors is very efficient under both cathode ray and UV excitation. − In the case of Y 2 Si 2 O 7 , only the luminescence of Ce 3+ and Tb 3+ ions has been extensively studied. ,− …”

Revealing Structural Detail in the High Temperature La2Si2O7–Y2Si2O7 Phase Diagram by Synchrotron Powder Diffraction and Nuclear Magnetic Resonance Spectroscopy

“…They exhibit interesting optical and mechanical properties. When doped, they have been shown to display promising luminescent responses for applications such as plasma displays, laser materials, and high-energy phosphors. − Of particular interest are the disilicates of Y, La, and Gd because these ions possess no electrons in the 4f shell, or in the case of Gd, the shell is half filled, and therefore, the three are optically inert in the visible and near-ultraviolet regions of the spectrum. Several studies have shown the importance of the crystalline structure adopted by the matrix silicate as well as the distribution of the dopants among the available RE crystallographic sites on the luminescent yield of these disilicate compounds. − …”

Crystal Structures and Photoluminescence across the La2Si2O7–Ho2Si2O7 System

“…Knowledge of the structural aspects described above is of great importance to understand the behavior and improve the properties of RE 2 Si 2 O 7 -based materials. It is well-known that when a RE 2 Si 2 O 7 matrix is doped with active lanthanide ions, it displays promising luminescent responses for applications such as plasma displays, laser materials, and high-energy phosphors. − Several studies have shown the importance of the crystalline structure adopted by the matrix silicate as well as the distribution of the dopants among the available RE 3+ crystallographic sites on the luminescent yield of these disilicate compounds. − …”