Luminescence of La3+ and Sc3+ impurity centers in YAlO3 single-crystalline films

Abstract

The luminescence of La Y 3+ and Sc Y 3+ and Sc Al 3+ centers created by lanthanum and scandium ions at Y 3+ and Al 3+ cation sites of YAlO 3 perovskite lattice was investigated. The features of emission of excitons localized at the mentioned centers in YAlO 3 :La and YAlO 3 :Sc single-crystalline films were analyzed by means of time-resolved emission spectroscopy and luminescence decay kinetics measurements under excitation by synchrotron radiation at 9 and 300 K. r 2007 Published by Elsevier B.V.

Scintillation and Energy-Storage Properties of Micro-Pulling-Down Grown Crystals of Sc3+- and La3+-Doped YAlO3 Perovskite

“…Meanwhile, the increase in Sc 3+ content from 1.0 to 5.0 mol.% led to the significant change of the spectrum form and the shift of the maximum of the main band up to 330 nm. Therefore, it is most probable that the Sc 3+ dopant provides two types of emission centers in the UV range in the YAP host [6]. Following the interpretation presented in Reference [6], the emission in the band peaked at 275 and 315 nm can correspond to the luminescence of the excitons localized at and bound with Sc 3+ isoelectronic dopant in Al sites of YAP host (LE(ScAl) and ScAl centers, respectively).…”

“…Therefore, it is most probable that the Sc 3+ dopant provides two types of emission centers in the UV range in the YAP host [6]. Following the interpretation presented in Reference [6], the emission in the band peaked at 275 and 315 nm can correspond to the luminescence of the excitons localized at and bound with Sc 3+ isoelectronic dopant in Al sites of YAP host (LE(ScAl) and ScAl centers, respectively). Increasing the total Sc concentration in YAP:Sc crystals led to the distribution of intensity of these centers, and the emission of the second center was dominated at a nominal Sc 3+ content of 5.0 mol.% (Figure 2A, curve 3).…”

“…The decay kinetics of RL of YAlO 3 :Sc crystals with an Sc concentration of 0.2 mol.% confirmed the above-mentioned assumptions. Indeed, the luminescence decay kinetics of two mentioned centers, registered in the vicinity of the respective emission bands at 275 and 320 nm, showed the typical shape of the decay curves corresponding to the creation of the triplet types of excitons (see References [6,[20][21][22][23] for more details). The three-component approximation I = Σ A i exp(−t/τ i ) of such decay curves gave the three decay components of luminescence of LE (Sc Al ) and Sc Al centers with decay times being equal to t 1 = 260 and 400 ns, t 2 = 1325 and 1915 ns, and t 3 = 3325 and 4950 ns.…”

“…Scintillation properties of Sc 3+ -and La 3+ -doped YAlO 3 (YAP) single crystalline films prepared using the liquid phase epitaxy (LPE) method were previously investigated by Zorenko et al [6]. Meanwhile, the luminescent and scintillation properties of Sc 3+ -and La 3+ -doped YAlO 3 crystals grown from the melt using a novel micro-pulling-down method are studied in this work for the first time.…”

Study on the Luminescence and Energy Level of Lanthanide Ions in Lu0.8Sc0.2BO3 Host

“…In the literature, 36,37 the STE emission at ∼4.59 eV (270 nm) in Lu 3 Al 5 O 12 :Sc is ascribed to the excitons localized around the Sc site. Zorenko 38 proposed that the TE in YAlO 3 :Sc emitting at about 290 nm is formed from the 2p-type hole localized at the singly charged O À ions and electron localized at the mixed 3p-states of Al 3+ and 3d-states of 39 Therefore, we tentatively propose that the STE in Lu 0.8 Sc 0.2 BO 3 host is formed from the 2p-type hole localized at the singly charged O À ions and electron localized at the 3d states of Sc 3+ , where the latter could be an anchoring element in the STE creation.…”