Search Results - "Rakov, Nikifor"

A study of energy transfer phenomenon leading to photon up-conversion in Ho3+:Yb3+:CaF2 crystalline powders and its temperature sensing properties by Rakov, Nikifor, Maciel, Glauco S.

“…When Ho3+:Yb3+:CaF2 crystalline powders prepared by combustion synthesis were exposed to near-infrared (λ ∼ 975 nm) radiation, intense photon up-conversion…”
Get full text

UV random laser emission from flexible ZnO-Ag-enriched electrospun cellulose acetate fiber matrix by da Silva-Neto, Manoel L., de Oliveira, Mário C. A., Dominguez, Christian T., Lins, Raquel E. M., Rakov, Nikifor, de Araújo, Cid B., Menezes, Leonardo de Souza, de Oliveira, Helinando P., Gomes, Anderson S. L.

“…We report an alternative random laser (RL) architecture based on a flexible and ZnO-enriched cellulose acetate (CA) fiber matrix prepared by electrospinning…”
Get full text

Mn2+ doped Zn2SiO4 phosphors: A threefold-mode sensing approach for optical thermometry in the visible region at 525 nm by Rakov, Nikifor, Matias, Francisco, Xing, Yutao, Maciel, Glauco S.

“…Optical functional materials such as nanostructured silicates have been studied for photonics applications involving energy conversion. In this scenario, we…”
Get full text

Optical temperature sensing by use of band-shape method in Tb3+-doped oxide powders by Rakov, Nikifor, Maciel, Glauco S.

“…•Different Tb3+-doped oxide powders were prepared for temperature sensing.•The potential of the powders by the band-shape method was investigated.•Aluminum…”
Get full text

Upconversion fluorescence and its thermometric sensitivity of Er3+:Yb3+ co-doped SrF2 powders prepared by combustion synthesis by Rakov, Nikifor, Maciel, Glauco S., Xiao, Mufei

“…Upconversion fluorescence of co-doped Er 3+ :Yb 3+ :SrF 2 powders prepared by combustion synthesis was investigated under near-infrared ( λ = 980 nm)…”
Get full text

Enhancement of luminescence efficiency of f–f transitions from Tb3+ due to energy transfer from Ce3+ in Al2O3 crystalline ceramic powders prepared by low temperature direct combustion synthesis by Rakov, Nikifor, Maciel, Glauco S.

Get full text

Strong photoluminescence and cathodoluminescence due to f–f transitions in Eu3+ doped Al2O3 powders prepared by direct combustion synthesis and thin films deposited by laser ablation by Rakov, Nikifor, Ramos, Francisco E., Hirata, Gustavo, Xiao, Mufei

“…In this letter, we report on fabrication and luminescent properties of phosphor powders and thin films of Eu3+ doped alumina Al2O3. The powders were fabricated…”
Get full text

Tm3+,Yb3+: Y2SiO5 up-conversion phosphors: Exploration of temperature sensing performance by monitoring the luminescence emission by Rakov, Nikifor

“…Tm3+,Yb3+:Y2SiO5 ceramic powders synthesized via combustion route exhibited up-conversion (UC) fluorescence when were submitted to CW-laser radiation at…”
Get full text

Three- and four-photon excited upconversion luminescence in terbium doped lutetium silicate powders by femtosecond laser irradiation by Rakov, Nikifor, Lozano B., Whualkuer, Falcão-filho, Edilson L., Guimarães, Renato B., Maciel, Glauco S., de Araújo, Cid B.

Get full text

Thermometric analysis of the near-infrared emission of Nd3+ in Y2SiO5 ceramic powder prepared by combustion synthesis by Maciel, Glauco S., Rakov, Nikifor

“…Nd3+:Y2SiO5 crystalline ceramic powder prepared by combustion synthesis exhibited down-conversion fluorescence when the sample was exposed to CW laser…”
Get full text

Eu3+-doped Y7O6F9 ceramic powder phosphor for optical thermometry based on fluorescence spectral techniques by Rakov, Nikifor, Matias, Francisco, Maciel, Glauco S.

“…In recent years, optical thermometry performance of europium (Eu3+) doped phosphors has been studied by probing the temporal and spectral change of the…”
Get full text

An efficient red light-emissive process from Eu3+ doped amorphous-derived CaAl2Si2O8 ceramic powders: Down-shifted luminescence with high thermal stability under 532 nm excitation by Rakov, Nikifor, Matias, Francisco, Xiao, Mufei

“…The present study reveals the luminescence performance of Eu3+ doped amorphous powders derived from calcium aluminum silicate (CaAl2Si2O8) ceramic host…”
Get full text

Broadband light emission induced by laser absorption and optimized by thermal injection in Nd 3+ :Y 2 SiO 5 ceramic powder by Rakov, Nikifor, Maciel, Glauco S.

“…Abstract Laser‐induced broadband (white) light emission has been studied in different particle systems for use in light‐emitting devices. The photoinduced…”
Get full text

Erbium doped gadolinium oxyorthosilicate powder for optical thermometry at the visible and near-infrared by Rakov, Nikifor, Maciel, Glauco S., Xiao, Mufei

“…Crystal growth and spectral analysis of erbium (Er3+) doped gadolinium oxyorthosilicate (Gd2SiO5) have been studied especially for use this system as a laser…”
Get full text

Three-photon upconversion and optical thermometry characterization of Er3+:Yb3+ co-doped yttrium silicate powders by Rakov, Nikifor, Maciel, Glauco S.

“…The effect of the presence of ytterbium (Yb3+) on the upconversion (UC) emission of erbium (Er3+) in yttrium silicate crystalline ceramic powders prepared by…”
Get full text

Influence of deposition conditions on optical properties of aluminum nitride (AlN) thin films prepared by DC-reactive magnetron sputtering by Mahmood, Arshad, Rakov, Nikifor, Xiao, Mufei

“…Aluminum nitride (AlN) films have been prepared by DC-reactive magnetron sputtering technique. The optical properties of the films have been studied by optical…”
Get full text

The near-infrared emission of Er3+-doped yttrium oxy-fluoride ceramic powders: Temperature reading using uncoupled and thermally coupled energy levels by Rakov, Nikifor, Matias, Francisco, Maciel, Glauco S., Xiao, Mufei

“…The performance of Er3+-doped yttrium oxy-fluoride (YOF) powders for optical temperature sensing is examined in this paper. YOF: Er3+ ceramic powders with…”
Get full text

Temperature sensing performance of Er3+:Yb3+ co-doped CaF2 ceramic powders using near-infrared light by Rakov, Nikifor, Matias, Francisco, Maciel, Glauco S.

Get full text

Energy transfer mechanism for generation of white light in Tb3+-doped calcium aluminosilicate amorphous powder by Rakov, Nikifor, Maciel, Glauco S.

“…Calcium aluminosilicate (Ca3Al2Si6O18) powders containing different doping concentrations of luminescent trivalent terbium ions (Tb3+) were prepared by…”
Get full text

Exploring the 4I13/2 → 4I15/2 radiative transition from Er3+ in Y2O3 for temperature sensing by Rakov, Nikifor, Maciel, Glauco S.

“…The influence of temperature on the near-infrared emission band corresponding to the radiative relaxation from 4I13/2 to 4I15/2 electronic states of Er3+ was…”
Get full text