Photoluminescence properties of (Eu, Tb, Tm) co-doped PbMoO4 obtained by sonochemical synthesis

Abstract

The PbMoO 4 co-doped with Tm 3þ , Tb 3þ Eu 3þ with scheelita structure was synthesized by the sonochemical method. The photoluminescent properties, structural and color coordinates emitted by phosphors were investigated. The structural analysis of the crystal and the changes in lattice parameters confirm that the rare earth ions (RE 3þ) were successfully introduced into the host of the PbMoO 4. The relationship between energy gap (Egap) and the concentration of RE 3þ ions was also discussed, the Egap is significantly influenced by the degree of structural order-disorder present in the crystal lattice. The PbMoO 4 :RE 3þ shows light emission in green. Under UV excitation, Photoluminescence (PL) shows a broad band centered at 520 nm and smaller bands belonging to transitions of RE 3þ :

Understanding the White-Emitting CaMoO4 Co-Doped Eu3+, Tb3+, and Tm3+ Phosphor through Experiment and Computation

“…The emission spectra were deconvoluted in order to further elucidate the emission centers and to qualitatively determine the contribution of each visible light component. Figure 8 (b) illustrates the results obtained from the deconvolution of the PL profiles 73,89,103 . The profile is well-described by the Voigt area function, and an analysis of the results revealed that the percentages of the areas in the green, blue, orange, and red region are approximately 55%, 20%, 19%, and 6%, respectively.…”

The role of the Tm3+ concentration on CaMoO4 properties processed by microwave hydrothermal under stirring condition

“…where β is the full width at half-height of the peak (FWHM), k is the form factor, λ is the wavelength of CuKα radiation, and θ is the Bragg angle. The unit cell volumes calculated were around 0.313 nm 3 17,58 According to Equation (1), the crystallite diameter varies inversely with the FWHM values. Therefore, an increase of FWHM (more disordered structure) results in a smaller crystallite diameter.…”

“…Some samples exhibit a slightly shift towards the purple spectral region, observed as a decrease in (x, y) coordinate values. This shift occurs due to the increase of the probability of the thulium electronic transitions 3 F 3 , 3…”

“…They found increased potential practical applications in many fields such as optical fiber, catalysts, scintillators, lasers, photoluminescence devices, humidity sensors, among others. [1][2][3][4][5][6][7][8] Among molybdates, calcium molybdate (CaMoO 4 ), is a representative scheelite-type compound with a tetragonal I4 1/a space group and C 6 4h symmetry. 9 Their physical properties, such as regular shape of particle and good crystallinity, result in excellent optical features and allow applications in several fields.…”

Protonation-Induced Enhanced Optical-Light Photochromic Properties of an Inorganic-Organic Phosphomolybdic Acid/Polyaniline Hybrid Thin Film

“…Li et al [ 10 ] fabricated a semiconductor/semiconductor-type MoO 3 @TiO 2 crystalline-core amorphous-shell nanorod photochromic material and the unique structure and heterojunction formed between MoO 3 and TiO 2 enhanced the photochromic properties of MoO 3 . Dai et al [ 11 ] synthesized a doped inorganic-type photochromic material by doping Pb 2+ into LiEuMo 2 O 8 , which expanded and distorted the crystal cell of LiEuMo 2 O 8 , resulting in a 50% enhancement in the red light emission from LiEuMo 2 O 8 . Lu et al [ 12 ] synthesized a new type of inorganic/organic hybrid photochromic material, As 4 Mo 8 O 33 /C 3 N 2 H 5 , which showed a remarkable photochromic effect, indicating that proton transfer from the imidazole cation to the polyanion plays a key role in the photochromic process.…”