An investigation of energy migration in luminescent diluted Gd3+ systems

New promising phosphors Ba3InB9O18 activated by Eu3+/Tb3+

“…5, the strong orange-red emission lines at 590 nm originating from the magnetic dipole transition 5 D 0 -7 F 1 are the dominant bands in the measured spectrum. This implies that site of Eu 3 + occupied by In 3 + ion is at inversion center, which is consistent with the structure data of BIBO [9]. Due to the effect of crystal field, the energy level of magnetic dipole transition 5 D 0 -7 F 1 was split into two peaks at 590 and 596 nm.…”

“…The interplanar distance of In ions is about 8.41Å, while that of intraplanar ions is about 7.13Å. It is assumed that the energy migration between activator ions in this matrix of BIBO is more restricted than those in other phosphors [9]. In addition, the polycrystalline BIBO has showed many advantages such as environmental benignity, high thermal stability, highly stable in air, and nondeliquescent in water.…”

Single-Crystal Growth and Structure Determination of a New Oxide Apatite, NaLa9(GeO4)6O2

“…The mechanism of concentration quenching is due to energy transfer between the fluorescent ions which have excited states of approximately equal energy and are close together. The critical distance for the energy transfer is considered to be between 0.4 and 0.5 nm from the calculation (12). The La-La distance in the oxyapatite NaLa Ge O may exceed the critical distance of concentration quenching.…”

Energy migration processes in undoped and Ce-doped multicomponent garnet single crystal scintillators

“…The critical distance ,R c, for Gd 3+ →Gd 3+ energy transfer was derived by studying the influence of a dilution of the Gd 3+ sublattice by optically inactive Y 3+ ions on the luminescence properties. This approach is discussed in detail in [36] and show that for oxides R c is around 6.5 Å. Efficient energy migration is only to be expected in gadolinium compounds where the Gd 3+ -Gd 3+ distance is less than the value of R c mentioned above.…”