Energy transfer in Ce and Eu co-doped barium thiogallate: A photoluminescence characterization

Effect of excitation level on the photoluminescence of barium thiogallate activated with europium and cerium ions

“…This effect has been observed previously [3] and studied in detail by Marceddu, et al [4], who explained it in terms of excitation energy transfer from Ce 3+ to Eu 2+ ions. This kind of transfer is possible since the level corresponding to the lower excited 5d 1 -state of cerium lies slightly above the lowest excited 4f 6 5d level of the europium ion.…”

An Investigation on the Luminescence and Ce3+→Eu2+ Energy Transfer in Ca9Y(PO4)7:Ce3+,Eu2+ Phosphor

“…Energy transfer mechanism.-According to Dexter's energy transfer formula for multipolar interaction and Reisfeld's approximation, the relation between reduced decay lifetime (τ S0 /τ S ) and Eu 2+ dopant content can be given by the follow equation: 18,19 η S0 η S ∝ C α/3 and I S0 I S ∝ C α/3 [3] where η S0 and η S are the luminescence quantum efficiencies of Ce 3+ in the absence and presence of Eu 2+ , respectively; the value of η S0 /η S can be approximately estimated from the luminescence intensity ratio (I S0 /I S ); C is the concentration of Eu 2+ ; and α = 6, 8, and 10 for dipole-dipole, dipolequadrupole, and quadrupole-quadrupole interactions, respectively. Equations 23 can thus be represented by the follow equation.…”

“…[1][2][3][4][5] Recently, Ce 3+ /Eu 2+ co-doped in same host has been considered for applications in single-host white-light light emitting diodes (LEDs) through Ce 3+ → Eu 2+ energy transfer. [1][2][3][4][5] Recently, Ce 3+ /Eu 2+ co-doped in same host has been considered for applications in single-host white-light light emitting diodes (LEDs) through Ce 3+ → Eu 2+ energy transfer.…”

Syntheses and characterization of two new selenides Ba5Al2Se8 and Ba5Ga2Se8

“…In the past years, many ternary chalcogenides in the A/M/Q system (A = alkaline-earth metal; M = Al, Ga, In; Q = S, Se, Te) have been discovered and studied, including the large family of the AM 2 Q 4 compounds [21][22][23][24][25], the A 2 M 2 Q 5 compounds [26], Ba 5 Ga 2 S 8 [27], Ba 4 Ga 2 S 7 [28], Ba 3 Ga 2 S 6 [28], and Mg 5 Al 2 Se 8 [29]. Extensive investigation has been carried out on the luminescent properties of these compounds doped with rare earth activators since 1970 and some were found to exhibit very attractive luminescent properties [30][31][32][33]. For example, Eu 2+ -activated barium thioaluminate, BaAl 2 S 4 :Eu 2+ , was one of the most promising materials for the blue component in full-colour inorganic electroluminescent (iEL) display [33][34][35].…”