Niobium enhanced europium ion luminescence in hafnia nanocrystals

Laganovska, Katrīna; Bite, Ivita; Zolotarjovs, Aleksejs; Šmits, Krišjānis

doi:10.1016/j.jlumin.2018.06.069

Cited by 10 publications

(9 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The cubic polymorph of hafnia can be stabilized at room temperature when sufficient doping with rare earth ions was achieved [1][2][3][4][5][6]. Indeed for doping levels exceeding 3 at.% the thermodynamically stable monoclinic phase of hafnium was not anymore the only favourable crystal structure, often leading to the simultaneous appearance of the cubic polymorph.…”

Section: Introductionmentioning

confidence: 99%

“…The origin of these structural modifications are attributed to the charge mismatch at the doping lattice site, and the consequent creation of defects by the substitutional doping. One proposed approach to avoid the effect of this defective dopant implies the simultaneous doping with elements with higher oxidation state than hafnium or zirconium, in order to compensate for the charge mismatch induced by the substitution of Hf 4+ or Zr 4+ by only trivalent RE 3+ ions [2,7,9,11,12]. This strategy was successfully applied to hafnia and zirconia by using Nb 5+ or Ta 5+ as co-dopants and a significant improvement of the Eu 3+ related emission was reported with increase ranging from 5 to 50 times [2,7,12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Charge Compensation in Europium-Doped Hafnia Nanoparticles: Solvothermal Synthesis and Colloidal Dispersion

2021

View full text Add to dashboard Cite

Effective charge compensation of europium in hafnium oxide nanoparticles was achieved at low temperature, allowing high doping incorporation (up to 6 at.%) and enhanced luminescence. The efficiency of the incorporation and charge compensation was confirmed by scanning electron microscope energy dispersive X-ray spectroscopy and powder X-ray diffraction measurements. Despite the known polymorphism of hafnium oxide, when doped to a concentration above 3 at.%, only the pure monoclinic phase was observed up to 6 at.% of europium. Furthermore, the low-temperature solvothermal route allowed the direct formation of stable dispersions of the synthesized material over a wide range of concentrations in aqueous media. The dispersions were studied by diffuse light scattering (DLS) to evaluate their quality and by photoluminescence to investigate the incorporation of the dopants into the lattice.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Charge Compensation in Europium-Doped Hafnia Nanoparticles: Solvothermal Synthesis and Colloidal Dispersion

2021

View full text Add to dashboard Cite

show abstract

“…Pure and Cr-doped alumina samples were synthesized using the sol-gel polymerized complex method, which was also used in our previous work [14]. Cr-doped alumina samples were prepared with varying concentrations (0.1, 0.2, 0.3, 0.35, 0.4, 0.7, 1 and 1.5 wt%) of the Cr 2 O 3 .…”

Section: Synthesis Of Non-doped and Cr-doped Al 2 O 3 Microceramic Pomentioning

confidence: 99%

Usability of Cr-Doped Alumina in Dosimetry

et al. 2019

View full text Add to dashboard Cite

Dosimetry is a widespread material science field dealing with detection and quantification of ionizing radiation using electronic processes in materials. One of the main aspects that determines the performance of dosimeters is the type of defects the material contains. Crystalline lattice imperfections are formed around impurity ions, which may have a smaller or larger size, or different oxidation states compared to host ions. In this study, we show what effects Cr impurities have on the luminescent properties of alumina. Porous Al 2 O 3 : Cr microceramics synthesized using the sol-gel method showed a higher thermoluminescence response than a single crystal ruby. We have found that Cr 2 O 3 concentration of 0.2 wt% was optimal; it yielded the highest X-ray luminescence and thermostimulated luminescence readout of all studied additive concentrations added to alumina during synthesis. Our results show that Cr doped alumina could potentially be used as a promising new material for dosimetry of ionizing radiation.

show abstract

“…HfO 2 nanoparticles are now potentially recognized as an active host for rare earth (RE) ions producing luminescent materials with superior optical performance. HfO 2 being a wide bandgap material provides a better compliance for the most of RE ions including Dy, Sm, Eu, Nb, Tb, etc . In the presence of an active RE ion, HfO 2 can significantly improve the photoluminescence properties of activator ions caused by energy transfer (ET) between different energy levels of the host and activator ion .…”

Section: Introductionmentioning

confidence: 99%

“…HfO 2 being a wide bandgap material provides a better compliance for the most of RE ions including Dy, Sm, Eu, Nb, Tb, etc. [15,[18][19][20][21][22] In the presence of an active RE ion, HfO 2 can significantly improve the photoluminescence properties of activator ions caused by energy transfer (ET) between different energy levels of the host and activator ion. [18,19] 3+ substituted at Hf 4+ in lattice.…”

Section: Introductionmentioning

confidence: 99%

Latent Fingerprint Imaging Using Dy and Sm Codoped HfO₂ Nanophosphors: Structure and Luminescence Properties

Sandeep

Bahadur

Rath

2019

Part & Part Syst Charact

View full text Add to dashboard Cite

The development of latent fingerprints (LFPs) detected at the site of crime is considered as an imperative physical evidence in forensic investigations. Herein, a rapid and cost‐effective approach using nonhazardous Dy and Sm codoped HfO2 nanophosphors is demonstrated to be utilized for LFP imaging. Sol–gel method can produce Dy and Sm codoped HfO2 of monoclinic phase with crystallite size ranging from ≈10 to 25 nm. While selected area electron diffraction and lattice spacing calculated from high‐resolution transmission electron microscopy confirm monoclinic phase, Le‐Bail profile refinement of X‐ray diffraction (XRD) patterns demonstrate an exponential increase in lattice volume with incorporating various concentrations of Dy and Sm in HfO2 lattice. Exciting Dy and Sm codoped HfO2 with 393 nm photoluminescence spectra show emissions in blue, yellow, and near red regions emerging primarily due to energy transfer from Dy3+ to Sm3+ through multipolar interaction suggested by time resolved decay spectra. Combining excitation and emission spectra, an energy band diagram is proposed. Owing to excellent emissions, Dy and Sm codoped HfO2 are explored for LFP imaging with good selectivity and resolution over multivariate surfaces like float glass and aluminum foil. The third‐level details like enclosure and termination–bifurcation are extracted due to nanosized nature of particles.

show abstract

Niobium enhanced europium ion luminescence in hafnia nanocrystals

Cited by 10 publications

References 33 publications

Charge Compensation in Europium-Doped Hafnia Nanoparticles: Solvothermal Synthesis and Colloidal Dispersion

Charge Compensation in Europium-Doped Hafnia Nanoparticles: Solvothermal Synthesis and Colloidal Dispersion

Usability of Cr-Doped Alumina in Dosimetry

Latent Fingerprint Imaging Using Dy and Sm Codoped HfO₂ Nanophosphors: Structure and Luminescence Properties

Contact Info

Product

Resources

About

Niobium enhanced europium ion luminescence in hafnia nanocrystals

Cited by 10 publications

References 33 publications

Charge Compensation in Europium-Doped Hafnia Nanoparticles: Solvothermal Synthesis and Colloidal Dispersion

Charge Compensation in Europium-Doped Hafnia Nanoparticles: Solvothermal Synthesis and Colloidal Dispersion

Usability of Cr-Doped Alumina in Dosimetry

Latent Fingerprint Imaging Using Dy and Sm Codoped HfO2 Nanophosphors: Structure and Luminescence Properties

Contact Info

Product

Resources

About

Latent Fingerprint Imaging Using Dy and Sm Codoped HfO₂ Nanophosphors: Structure and Luminescence Properties