Up-conversion luminescence in rare earth ions (REs) doped nanoparticles has attracted considerable research attention for the promising applications solid-state lasers, three-dimensional displays, solar cells, biological imaging, and so forth. However, there have been no reports on REs to investigate their polarized energy transfer up-conversion, especially single particle. Herein, up-conversion from fluoride nanorods is demonstrated a particle spectroscopy mode first time. Unique...

Abstract Here, tuning of the optical properties emission centers by tailoring ligand fields is investigated. Experimentally, it demonstrated that Ni 2+ can act as a single species in multiple octahedral local environments. Nanocrystal‐embedded hybrid materials are employed hosts order to take advantage their convenience environment design for practical applications. Novel composite gain with high transparence successfully made, and show interesting wavelength‐tunable ultra‐broadband infrared...

Plasmonic enhancement induced by metallic nanostructures is an effective strategy to improve the upconversion efficiency of lanthanide‐doped nanocrystals. It demonstrated that plasmonic luminescence (UCL) single NaYF 4 :Yb 3+ /Er /Mn 2+ nanocrystal can be tuned tailoring scattering and absorption cross sections gold nanorods, which synthesized wet chemically. The assembly nanorod achieved atomic force microscope probe manipulation. By selecting two kinds nanorods with similar longitudinal...

Luminescence from crystals is often anisotropic and it leads to the polarization behavior of luminescence single crystalline particles, as exemplified here with upconversion a NaYF4 nanodisk. Nanodisk aggregates exhibit dependent different degrees, which depends on orientation distribution nanoparticles.

The use of one-dimensional nano- and microstructured semiconductor lanthanide materials is attractive for polarized-light-emission studies. Up-conversion emission from single-nanorod or anisotropic nanoparticles with a degree polarization has also been discussed. However, microscale arrays nanoparticles, especially well-aligned nanostructures as well their up-conversion characterization, have not investigated yet. Herein, we present novel facile paradigm preparing highly aligned...

Transparent glass-ceramics containing β-Ga2O3:Ni2+ nanocrystals were synthesized and characterized by X-ray diffraction, transmission electron microscopy, energy loss spectroscopy. Intense broad-band luminescence centering at 1200 nm was observed when the sample excited a diode laser 980 nm. The room-temperature fluorescent lifetime 665 μs, which is longer than Ni2+-doped ZnAl2O4 LiGa5O8 also comparable to single crystal. intense infrared with long may be ascribed high crystal field hold...

We report on a novel method to fabricate single, multiple and large-area high-density ensembles of nitrogen vacancy (NV) color centers in synthetic type Ib bulk diamond by femtosecond laser illumination. Electron beams generated propagation intense infrared pulses air sputtered sample under high temperature aroused the illumination, creating NV centers. Typical photoluminescence (PL) spectra could be observed illuminated spots. Photon streams from individual photoluminescent points exhibited...

This study addresses the challenges associated with precisely targeting marketing SMS for power users of State Grid. Existing collaborative filtering recommendation algorithms, while capable predicting user preferences through representation learning and matching functions, fall short in accurately capturing various activities str uggle to effectively mine correlations between embedded dimensions during interactions activities. To overcome these limitations, we propose a Neural Collaborative...

An analogy of electromagnetically induced transparency (EIT) based on all-dielectric metamaterial is theoretically demonstrated in this paper. The U-shaped Silicon-based unit cell comprises a dipole antenna supported by one horizontal nanoscale bar and quadrupolar two vertical bars. near-field coupling between the antennas reduction absorption loss lead to narrow EIT-like transmission window with high quality-factor 130, which exhibits refractive index sensitivity figure-of-merit 29. group...

We demonstrate broadband optical amplification at 1.3 mum in silicate glass-ceramics containing beta-Ga(2)O(3):Ni(2)+ nanocrystals with 980 nm excitation for the first time. The gain efficiency is calculated to be about 0.283 cm(-1) when power 1.12 W. shows similar wavelength dependence luminescence properties.

Optical properties of quantum dots can be drastically changed by surface plasmons excited in neighboring metallic nanostructures. Here we investigated the photoluminescence enhancement dependence single on separation distance with Au microplates a particle spectroscopy. The dot–Au microplate hybrid structures provided up to ∼16-fold when between and center QD was 18 ± 1.9 nm. Accordingly, lifetime those shortened compared ones glass plates directly. Theoretical simulation revealed that...

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Spectral properties of Yb3+∕Ni2+ codoped transparent silicate glass ceramics containing LiGa5O8 nanocrystals were investigated. The near-infrared emission intensity Ni2+ was largely increased with Yb3+ codoping due to Yb3+→Ni2+ energy transfer. qualitative calculation the transfer constant Cs-a and rate Ps-a showed that much greater than in opposite direction. 0.75mol% Yb2O3 exhibited a full width at half maximum 290nm fluorescent lifetime 920μs. are promising for broadband optical amplification.

The emission intensity of Ni(2+) at 1200 nm in transparent ZnO-Al(2)O(3)-SiO2 glass ceramics containing ZnAl(2)O(4) nanocrystals is improved approximately 8 times by Cr(3+) codoping with 532 excitation. This enhanced could be attributed to an efficient energy transfer from Ni(2+), which confirmed time-resolved spectra. efficiency estimated 57% and the mechanism also discussed.

Metallic nanowires are of great research interest due to their applications in surface plasmon polariton coupling light. The efficiency is much dependent on the polarization light phase matching requirement light-surface coupling. By scanning confocal microscope, photoluminescence from a single Ag nanowire was demonstrated strongly excitation laser polarization, showing good consistency with theoretical simulation. Meanwhile strong avalanche observed when polarized along long axis nanowire....

Lanthanide doped upconversion nanoparticles reveal enormous potential for biomedical applications. However, they are limited by low efficiency. In this paper, we demonstrate tip-enhanced luminescence (UCL) from a single Yb3+–Er3+-codoped NaYF4 nanoparticle with maximum enhancement factor of 11 the plasmonic effect, which is solution improving conversion efficiency and will become technique applications in sensitive imaging detection via speeding up both absorption emission processes...

Transparent Ni2+-doped MgO–Al2O3–TiO2–SiO2 glass ceramics were prepared, and the optical properties of investigated. Broadband emission centered at 1320nm was observed by 980nm excitation. The longer wavelength luminescence compared with Li2O–Ga2O3–SiO2 is ascribed to low crystal field hold Ni2+ in ceramics. change signals telecommunication bands or without excitation also measured when seed beam passes through bulk gain host.

We report the generation of single negatively charged silicon vacancy (SiV−) color centers by focusing a femtosecond (fs) laser on top high-purity diamond coated with layer Si nanoball. Under interaction high-intensity fs laser, atoms were ionized and implanted into diamond, accompanied creation vacancies. After annealing at 850°C in vacuum for 1 h, photoluminescence spectra bright spots around created crater presented typical strong zero-phonon line 737 nm SiV− centers. Bright could be...