Short wavelength emission properties of Tm3+ and Tm3++Yb3+ doped LaAlO3 nanocrystals and polymer composites

Jusza, Anna; Lipińska, L.; Baran, M.; Polis, Paweł; Olszyna, A.; Piramidowicz, Ryszard

doi:10.1016/j.optmat.2019.109365

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…Увеличение содержания Yb 3+ и Tm 3+ в позициях 4 f приводит к росту катионных вакансий для образцов с x = 0.02 и x = 0.05. Предполагаемый механизм образования таких вакансий: 1 D 2 → 3 F 4 [20]. Для образцов c x = 0.005 и 0.01 также проявляется серия интенсивных линий в красной области, соответствующих переходам 1 G 4 → 3 F 4 (636 nm), 3 F 2 → 3 H 6 (660 nm), 1 D 2 → 3 H 4 (674 nm) [21].…”

Section: результаты и обсуждениеunclassified

“…Для образцов c x = 0.005 и 0.01 также проявляется серия интенсивных линий в красной области, соответствующих переходам 1 G 4 → 3 F 4 (636 nm), 3 F 2 → 3 H 6 (660 nm), 1 D 2 → 3 H 4 (674 nm) [21]. Также в зеленой области расположена линия с пиком 519 nm, соответствующая переходу 1 D 2 → 3 H 5 [20]. Также регистрируется переход 1 G 4 → 3 H 6 (474 nm).…”

Section: результаты и обсуждениеunclassified

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Новые апконверсионные объемные и нанолюминофоры на основе Sr-=SUB=-2-=/SUB=-Y-=SUB=-8-x-y-=/SUB=-Yb-=SUB=-y-=/SUB=-Tm-=SUB=-x-=/SUB=-Si-=SUB=-6-=/SUB=-O-=SUB=-26-=/SUB=-

Зуев¹,

Васин²,

Ильвес³

et al. 2023

Оптика И Спектроскопия

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Polycrystalline phosphors with a Sr2Y8-x-yYbyTmxSi6O26 (x=0.005-0.5, y=0.2,0.3) total formula were synthesized. Nanoluminophor has been obtained from the Sr2Y7.695Yb0.3Tm0.005Si6O26 microcrystalline sample by the vacuum electron been evaporation, in the amorphous state, with the ~10.6 nm particle size. It is found, raman spectra undergoing modification by the transition from bulk- to nanosize state. Photoluminescene spectra micro- and nanophosphors are studied. Intensity of the blue emission, by the UV ligth excitation, grows in the x=0.005-0.02 region, with the x increasing. Upconversion photoluminescence (UPCL) spectra of the bulk phosphors and nanosample based on the Sr2Y7.695Yb0.3Tm0.005Si6O26 were measurd. At the pumping power around 70.8 mW, by the laser source with the λ=980 nm, thereshold population of the 3F3 level of Tm3+ ions exist. At a power higher 70.8 mW, a sharp increase of the luminescence intensityof the bulk- and nanophosphor occurs. For the 3H4->3H6 transition thereshold pumping power absent. This indicates that, pumping, during Yb->Tm energy transer, is a single photon process.

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Section: результаты и обсуждениеunclassified

Новые апконверсионные объемные и нанолюминофоры на основе Sr-=SUB=-2-=/SUB=-Y-=SUB=-8-x-y-=/SUB=-Yb-=SUB=-y-=/SUB=-Tm-=SUB=-x-=/SUB=-Si-=SUB=-6-=/SUB=-O-=SUB=-26-=/SUB=-

Зуев¹,

Васин²,

Ильвес³

et al. 2023

Оптика И Спектроскопия

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“…Additionally, the oxygen vacancies will distort the perfect cubic perovskite lattice of LaAlO 3 to some extent, lowering the material's reflectivity. Exploring a technique to lessen the oxygen vacancy flaws in LaAlO 3 is, therefore, significant [37][38][39][40]. The structure can also be tuned, and high-temperature flaws can be prevented by optimizing the preparation conditions based on the current preparation process.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Structure and Optical Properties of Lanthanum Aluminate Perovskite through Nb5+ Doping

Liu,

Zou,

Chen

et al. 2024

Nanomaterials

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This work involves the introduction of niobium oxide into lanthanum aluminate (LaAlO3) via a conventional solid-state reaction technique to yield LaAlO3:Nb (LaNbxAl1−xO3+δ) samples with Nb5+ doping levels ranging from 0.00 to 0.25 mol%. This study presents a comprehensive investigation of the effects of niobium doping on the phase evolution, defect control, and reflectance of LaNbxAl1−xO3+δ powder. Powder X-ray diffraction (XRD) analysis confirms the perovskite structure in all powders, and XRD and transmission electron microscopy (TEM) reveal successful doping of Nb5+ into LaNbxAl1−xO3+δ. The surface morphology was analyzed by scanning electron microscopy (SEM), and the results show that increasing the doping concentration of niobium leads to fewer microstructural defects. Oxygen vacancy defects in different compositions are analyzed at 300 K, and as the doping level increases, a clear trend of defect reduction is observed. Notably, LaNbxAl1−xO3+δ with 0.15 mol% Nb5+ exhibits excellent reflectance properties, with a maximum infrared reflectance of 99.7%. This study shows that LaNbxAl1−xO3+δ powder materials have wide application potential in the field of high reflectivity coating materials due to their extremely low microstructural defects and oxygen vacancy defects.

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“…This is a very difficult task, due to the insolubility of lanthanide salts in organic solvents. The team of R. Piramidowicz [ 9 , 10 , 11 ] studied the properties of such structures in a different spectral range and by adding lanthanides under different forms to methyl methacrylate. The study in [ 12 ] compared the UV luminescence properties of YF 3 , LaAlO 3 , Al 2 O 3 , and Y 2 O 3 compounds subsidized with Pr 3+ ions, which were then added to PMMA-based composites.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of CdSe Quantum Dots in Two Solvents of Different Boiling Points for Polymer Optical Fiber Technology

Kiczor,

Mergo

2023

Materials

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Polymer materials find many applications in various industries. Efforts are being made to obtain structures with increasingly better properties. It is necessary not only to obtain new materials but also to modify existing structures. Such is the situation with polymer optical fibers. The widespread use of polymer optical fibers is impossible, due to their very high optical losses compared to glass optical fibers. The solution to this problem can be the manufacturing of polymer active optical fibers. Active fibers are the basic components of fiber optic amplifiers and lasers that allow the direct amplification of light inside the fiber. In order for their operation to be the most effective, it is necessary to use dopants. The most commonly used are lanthanide ions isolated from the polymer network, active organic dyes, and quantum dots. These dopants are characterized by very high luminescence and long glow times. Quantum dots of CdSe are made using two organic solvents that differ in boiling points—hexane (a low-boiling solvent with a boiling point of 69 °C) and 1-octadecene (a high-boiling solvent with a boiling point of 315 °C). This work aims to test whether the type of solvent used to obtain quantum dots affects the doping capabilities of polymer structures, from which optical fibers can then be drawn.

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Short wavelength emission properties of Tm3+ and Tm3++Yb3+ doped LaAlO3 nanocrystals and polymer composites

Cited by 6 publications

References 12 publications

Новые апконверсионные объемные и нанолюминофоры на основе Sr-=SUB=-2-=/SUB=-Y-=SUB=-8-x-y-=/SUB=-Yb-=SUB=-y-=/SUB=-Tm-=SUB=-x-=/SUB=-Si-=SUB=-6-=/SUB=-O-=SUB=-26-=/SUB=-

Новые апконверсионные объемные и нанолюминофоры на основе Sr-=SUB=-2-=/SUB=-Y-=SUB=-8-x-y-=/SUB=-Yb-=SUB=-y-=/SUB=-Tm-=SUB=-x-=/SUB=-Si-=SUB=-6-=/SUB=-O-=SUB=-26-=/SUB=-

Optimizing the Structure and Optical Properties of Lanthanum Aluminate Perovskite through Nb5+ Doping

Synthesis of CdSe Quantum Dots in Two Solvents of Different Boiling Points for Polymer Optical Fiber Technology

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