Excitation-Dependent Photoluminescence of BaZrO3:Eu3+ Crystals

Abstract

The elucidation of local structure, excitation-dependent spectroscopy, and defect engineering in lanthanide ion-doped phosphors was a focal point of research. In this work, we have studied Eu3+-doped BaZrO3 (BZOE) submicron crystals that were synthesized by a molten salt method. The BZOE crystals show orange–red emission tunability under the host and dopant excitations at 279 nm and 395 nm, respectively, and the difference is determined in terms of the asymmetry ratio, Stark splitting, and intensity of the uncommon 5D0 → 7F0 transition. These distinct spectral features remain unaltered under different excitations for the BZOE crystals with Eu3+ concentrations of 0–10.0%. The 2.0% Eu3+-doped BZOE crystals display the best optical performance in terms of excitation/emission intensity, lifetime, and quantum yield. The X-ray absorption near the edge structure spectral data suggest europium, barium, and zirconium ions to be stabilized in +3, +2, and +4 oxidation states, respectively. The extended X-ray absorption fine structure spectral analysis confirms that, below 2.0% doping, the Eu3+ ions occupy the six-coordinated Zr4+ sites. This work gives complete information about the BZOE phosphor in terms of the dopant oxidation state, the local structure, the excitation-dependent photoluminescence (PL), the concentration-dependent PL, and the origin of PL. Such a complete photophysical analysis opens up a new pathway in perovskite research in the area of phosphors and scintillators with tunable properties.

A Novel Warm Red-Emission of SrLa0.9Eu0.1AlO4 Phosphor obtained by Combustion Method.

“…It shows a broad band emission ranging from 240-340 nm but peak at 279 nm. This 279 nm correlates with the charge transfer band (CTB) state of electrons between the occupied 2p orbitals of O 2to the vacant 4f-orbital of Eu 3+ which confirms reports [23]. The SLA:Eu 3+ was excited at 279 nm to produce a down-conversion emission as shown in Fig.…”

“…The 593 nm is a strong magnetic and the intensity are strongly dependent on the Eu 3+ ion environment [24]. The 537 nm is an electric and weak transition with absorptivity values reported to be less than 1 Lmol -1 cm -1 which occur due to the UV light [23]. The sample that present the highest PL intensity under 279 nm excitation was the doped with x= 0.10 mol.% (SLA 1), the inset in Fig.…”

Photoluminescence properties of europium-activated double layered perovskite Sr3Ti2O7 for high-quality lighting applications

“…The quantum yields of various other Eu 3+ doped phosphors are presented in Table 3. [40][41][42][43][44][45][46][47][48][49] The phosphor demonstrates a notable quantum efficiency of 18%. In comparison, the widely known-Eu 3+ doped Y 2 O 3 and YVO 4 phosphors have a higher quantum yield.…”

Highly Conductive Cerium- and Neodymium-Doped Barium Zirconate Perovskites for Protonic Ceramic Fuel Cells

“…In this respect, the BaZrO 3 -and BaCeO 3 -perovskite oxide-based proton conducting electrolyte materials have been studied extensively in the PCFCs as they exhibit high ionic conductivities at this optimal temperature range with low activation energies (0.4-0.6 eV) [1,2]. In recent years, BaZrO 3 compounds have found a lot of new applications, such as hybrid luminescent composites and luminescent screens [3,4]. Reportedly, the former BaCeO 3 electrolyte exhibited a higher proton conductivity of 10 −2 Scm −1 at 600 • C [5].…”