Synthesis and characterization of erbium‐doped YAlO₃ phosphor

Abstract

In the yttrium aluminium system, the YAlO3 phosphor is a prominent host because of the yttrium aluminium ratio (1:1). Phosphor was synthesized by the solid-state reaction method at variable concentrations of erbium (0.1-2.5 mol%). This method is suitable for large-scale production and is a less time-consuming method when compared with the soft synthesis method. The prepared sample was characterized by X-ray diffraction technique and the crystallite size was calculated by Scherer's formula. Vibrational and bending analysis of prepared phosphor for optimized concentration of erbium ion is described based on the Fourier transform infrared spectroscopic technique. The photoluminescence (PL) emission spectra of prepared phosphor for variable concentrations of erbium ion were recorded and the excitation spectrum was found to be at 291 nm with three shoulder peaks at 305, 270 and 242 nm. For 291 nm excitation, the emission spectrum was found at 546 nm and 552 nm. PL intensity increased with increasing concentrations of erbium and after 2 mol% emission intensity decreased due to concentration quenching. Spectrophotometric determination of YAlO3:Er(3+) is described by CIE co-ordinates and shows an intense emission in the green region such that the prepared phosphor can act as a single host for green light emission. Thermoluminescence glow curve analysis of the YAlO3:Er(3+) phosphor was recorded for different ultraviolet (UV) light exposures and gamma exposure. Different gamma doses 0.5-2 kGy show a linear response. Kinetic parameters were calculated by the peak shape method.

Effects of Vanadium on the Structural and Optical Properties of Borate Glasses Containing Er3+ and Silver Nanoparticles

“…However, when the concentration of vanadium exceeded 1.5 mol%, the intensity decreased. Thus, the decrement was due to concentration quenching [37,38]. At a high amount of vanadium, the excess vanadium ions produce structural defects that cause nonradiative recombination.…”

Fabrication of Er3+:YAlO3 fibers by electrospinning method for upconversion luminescence applications

“…6,7 The luminescence intensity and spectral properties of Er 3+ :YAlO 3 can be tuned by adjusting the concentration of Er 3+ ions and the excitation wavelength. 4,8 Er 3+ :YAlO 3 -based upconversion materials are widely applied in the fields of bioimaging, sensing, laser technology and catalysis. In particular, Er 3+ :YAlO 3 upconversion nanoparticles (UCNPs) are a promising choice for bioimaging due to their excellent biocompatibility and low toxicity.…”

“…5,14,15 Currently, Er 3+ :YAlO 3 materials are predominantly utilized in the form of particles, and various synthesis methods, including solid-state reaction, sol-gel method and hydrothermal synthesis, have been developed for the preparation of Er 3+ :YAlO 3 nanoparticles. 8,16,17 While nanoparticles have many applications, one-dimensional materials such as fine fibers can exhibit novel physical and chemical properties in catalysis and optics, and avoid powder recovery issues. Their unique morphology ensures efficient light guiding and manipulation, positioning them as top contenders for various optical applications.…”

“…The upconversion luminescence of Er 3+ :YAlO 3 is attributed to the f‐f transition of the Er 3+ ions, which has a long excited‐state lifetime and a large absorption cross‐section 6,7 . The luminescence intensity and spectral properties of Er 3+ :YAlO 3 can be tuned by adjusting the concentration of Er 3+ ions and the excitation wavelength 4,8 …”

Origin of Color Centers in the Perovskite Oxide CeAlO3

“…Rare‐earth aluminate perovskites form an important class of functional materials, such as LuAlO 3 , YAlO 3 and NdAlO 3 , which are crucial for a wide range of applications, for instance in lasers and scintillators, and in magnetooptical, ferroelectrical, dielectrics, and photocatalytic applications . Among these perovskite‐type rare earth aluminate oxides, CeAlO 3 is of great importance in optical related fields, laser crystal, scintillator, etc . Furthermore, due to the unique electronic configuration, Ce ion is more prone to changing valence.…”