Luminescence properties of layered perovskites activated by Eu3+ ions

A bona fide two-dimensional percolation model: an insight into the optimum photoactivator concentration in La2/3-xEuxTa2O7nanosheets

“…The validity of this theory has been studied for bulk two-dimensional systems by investigating their photoluminescence properties. For those phosphors, the experimentally determined optimum photoactivator concentration agreed well with that predicted by the theory [24,26,30]. In general, interlayer interaction in bulk layered compounds is considered to be weak.…”

“…Previously, various bulk layered oxides with Ln 3+ -photoactivators were investigated to confirm the validity of this model for bulk two-dimensional systems [24,26,30]. The experimentally determined x c of those bulk layered oxides corresponded well with those estimated from the percolation theory.…”

“…This phenomenon is known as concentration quenching [25]. Thus, the photoactivator concentration must be optimized by balancing these two aspects in order to obtain the best emission performance from a system of interest [26,27]. This sort of optimization can be done through experimental one-by-one characterizations of phosphor compounds with various photoactivator concentrations.…”

Photoluminescence in Low-Dimensional Oxide Ferroelectric Materials

“…The quenching concentration of BEuT thin films is about 0.40. Similar unusual concentration quenching effect of photoluminescence has also been observed in some Eu 3+ -ion-activated layered perovskite luminescent powder materials such as Na 2 [43,44]. It was suggested that in these layered perovskite luminescent powder materials, the energy transfer was restricted in the Eu 3+ sublattices.…”

Europium-doped calcium titanate: Optical and structural evaluations

“…The luminescence of Eu 3+ results from the intraconfigurational f-f transitions [8] which occurs from the 5 D J (J = 0, 1-3) and 5 L 6 excited states to the 7 F J 0 (J 0 = 0, 1-6) ground states. Luminescence of rare earth element doping perovskite electronic ceramics has become attractive during the past decade, not only in the use of these ions as a probe to investigate local centers and energy migration processes in the microstructures of electronic materials [9][10][11][12][13][14][15] but also a new technological display [16][17][18] , etc. are candidates in applications for advanced displays [14,[19][20][21][22].…”