Effect of Ho3+ concentration on the structure, morphology and optical properties of Ba0.5Mg0.5Al2O4 nanophosphor

Electronic and Simple Oscillatory Conduction in Ferrite Gas Sensors: Gas-Sensing Mechanisms, Long-Term Gas Monitoring, Heat Transfer, and Other Anomalies

“…Therefore, these reduction/oxidation processes govern the whole chemisorbed oxygen species and space charge layers. 50 The PL of these inverse spinel structures is shown in Figure 13. The spectra show that there are two emission bands located at around 414 and 440 nm when excited at 325 nm.…”

“…They had lower oxygen vacancy content and more trivalent cations from the tetrahedral site containing Co 3+ and octahedral site (Fe 3+ , Ce 3+ , and Sm 3+ ) to compensate and create a dominant cation. Therefore, these reduction/oxidation processes govern the whole chemisorbed oxygen species and space charge layers …”

Effects of Varying Alx Moles on the Structure and Luminescence Properties of ZnAlxO1.5x + 1:0.1% Tb3+ Nano Phosphor Prepared using Citrate sol-gel Method

“…When x ≥ 1.5, the (311) diffraction peak shifts towards higher diffraction angle signifying a decrease in lattice constant. Meaning that some of the Al 3+ (ionic radius = 0.53 Å [7,34]) are occupying the Zn 2+ (ionic radius = 0.74 Å [9,34]) site. This behaviour can be explained using the Vegard's law [35,36] which suggests that the substitution or replacement of a certain ion with the smaller or bigger ionic radius is expected to shrink or expand the lattice constant, respectively.…”

“…In the past few decades, metal oxides (MO) have enticed many researches in different field due to their unique physical and chemical properties [1]. MO are on the cutting edge of technology in various field of science such as water splitting [2][3][4], energy storage and conversions [5,6], photoluminescence (PL) [7][8][9] and transparent conducting oxide [1,10,11]. This is because of their band gap located directly at the Г point which was determined theoretically and experimentally to be around few electron volts (eV) [12][13][14].…”

“…Most researchers introduce foreign ions (i.e. dopants) mostly form the lanthanides or rare earths within the different host at various doping concentrations [7][8][9][22][23][24]. Trivalent terbium ion (Tb 3+ ) is one of the most explored dopant due to its emission broadband covering the entire visible wavelength with an intense green emission colour around 525-560 nm [19,[22][23][24][25].…”