High resolution luminescence spectroscopy and thermoluminescence of different size LaPO4:Eu3+ nanoparticles

Abstract

Nanoparticles (5 nm) and nanorods (2 nm × 15 nm and 4 nm × 20 nm) of monoclinic monazite LaPO 4 :Eu 3+ were prepared by reverse micelle and co-precipitation techniques. Effects of the particle size and surface defects on the intensity of luminescence and the emission spectrum shapes were analyzed by high resolution spectroscopy under laser (266 nm) and X-rays excitation. All synthesized LaPO 4 :Eu 3+ samples showed similar spectral features with characteristic Eu 3+ ions emission bands: 5 D 0 → 7 F 0 centered at 578.4 nm, magnetic-dipole transition 5 D 0 → 7 F 1 at 588-595 nm, electric-dipole transition 5 D 0 → 7 F 2 at 611.5-620.5 nm, 5 D 0 → 7 F 3 at (648-652 nm) and 5 D 0 → 7 F 4 at (684-702.5 nm), with the most dominant electric-dipole 5 D 0 → 7 F 2 transition. Additionally, the thermally stimulated luminescence was studied for the most dominant peak at 611.5 nm. It was shown that the Eu 3+ doping creates traps in all samples. Two prominent and well resolved glow peaks at 58.7 K and 172.3 K were detected for 5 nm nanoparticles, while low-intensity glow-peaks at 212.1 K and 212.2 K were observed in the X-rays irradiated nanorods. Displayed glows could be attributed to free and bound electrons and holes or to the recombination of electrons of ionized oxygen vacancies with photogenerated holes. To obtain information about the processes and specific defect type it is necessary to carry out additional analysis for all synthesized samples. The glow curves were analyzed and trap parameters were estimated and discussed throughout the paper.

Luminescence and dosimetry approach in terbium(III)‐activated tungstate double perovskite

“…The calculated shape factor value indicates that both deconvoluted peaks identified above follow second-order kinetics. The activation energy was calculated using a general formula suggested by Chen that was applicable to any order of kinetics [49]:…”

Preparation and Optical Properties of La₃PO₇:Eu³⁺ Nanophosphors Synthesized by Combustion Method

“…7) Among them, nano LaPO 4 materials are of great interest. 8,9) In 2004, LiXinYu and HongweiSong incorporated Eu 3+ on LaPO 4 by the hydrothermal method. 8) On the other way, Ivica Vujcic and Tarama Gavrilovic prepared this material by the solid-state way in 2018.…”

“…8) On the other way, Ivica Vujcic and Tarama Gavrilovic prepared this material by the solid-state way in 2018. 9) As an activator, the Eu 3+ ion has been investigated frequently due to its excellent fluorescent properties. In practical applications, the characteristic emission from LaPO 4 : Eu 3+ is composed of almost equal contributions from the 5 D 0 ¼ 7 F 1 and the 5 D 0 ¼ 7 F 2 transitions.…”

“…In practical applications, the characteristic emission from LaPO 4 : Eu 3+ is composed of almost equal contributions from the 5 D 0 ¼ 7 F 1 and the 5 D 0 ¼ 7 F 2 transitions. 8,9) Therefore, LaPO 4 : Eu 3+ is an orange-red emission material instead of red colour purity. This changing depends on the crystal symmetry of the matrix.…”

Molten‐Salt‐Assisted Synthesis of Na3Bi(PO4)2:Eu3+ Nanoparticles with Strong Red Emission

“…Rare earth (RE) ion doped luminescent materials have been attracting a great deal of attention as candidates to achieve versatile optical applications in white light‐emitting diodes (WLEDs), display devices, scintillators, lasers, and sensors . RE ions have distinctive electron configurations in which 4f − 4f electron transitions take place, endowing them with unique physicochemical properties.…”