Optical spectroscopy of lanthanides doped in wide band-gap semiconductor nanocrystals

Liu, Yongsheng; Luo, Wenqin; Zhu, Haomiao; Chen, Xueyuan

doi:10.1016/j.jlumin.2010.07.018

Cited by 64 publications

(31 citation statements)

References 27 publications

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“…Consequently, oxygen vacancies cannot be excluded when accounting for the slight broadening of the Sm 3+ emission peaks, and they may indeed mediate the energy transfer from host to dopant, as claimed by Singh et al [16] for SnO2 and by Liu et al [5] for ZnO and TiO2. Singh and his co-workers [16] recently reported sensitized luminescence of Sm dopant in SnO2 nanoparticles; their sensitized emission spectra were broad and not well resolved, but those authors discovered important annealing consequences including the removal of quenching surface hydroxides, in contrast to earlier research [24].…”

Section: Photoluminescence Sensitization Of Sm 3+ -Doped Sno2 Nanocrymentioning

confidence: 99%

“…Several cases have been reported of lanthanide doping of TiO2 nanocrystals to favor one phase over the other in respect to desirable optical properties [5,20,22]. SnO2 nanocrystals, on the other hand, show a single rutile structure.…”

Section: Photoluminescence Sensitization Of Sm 3+ -Doped Sno2 Nanocrymentioning

confidence: 99%

“…However a drawback of lanthanides is their weak absorption for direct excitation due to the spin-forbidden nature of f-f transitions, which limits their efficiency [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…The demand for an improvement in energy efficiency in optoelectronic devices has prompted extensive research into enhancement of luminescence by host sensitization via energy transfer mechanisms [1,4,5]. Successful energy transfer from the triplet states of organic ligands to their neighboring ions has been widely reported for metal-organic complexes, but these materials often lack thermal stability, which is vital for many solid-state device applications [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Studies of SnO2 doped with ions such as Er [11], Dy [12], Eu [13], Sb [14] and Mg [15] have been reported, but to the best of our knowledge, very few reports exist of host sensitization energy transfer studies involving SnO2 nanocrystals and Sm 3+ ions [16]. Sensitized emission from semiconductors has mainly been reported for TiO2 host structures [5], but in most cases the semiconductor was embedded in a partiallycrystalline or amorphous matrix, and the resulting reduction in site homogeneity and symmetry led to broadening of the emission peaks at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and photoluminescent properties of Sm3+-doped SnO2 nanoparticles

Faustino

Foot

Kresiński

2016

Ceramics International

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SnO2 ceramic nanoparticles homogeneously doped with Sm 3+ ions were synthesized via a sol-gel method, followed by drying and annealing in air. Xray diffractometry, FT-IR spectrometry and transmission electron microscopy were used to characterize the nanoparticulate samples. After annealing, both doped and undoped SnO2 nanopowders were shown to adopt the rutile tetragonal crystal form and to exhibit characteristic Sn-O-Sn vibrations. The average particle size was found to be in the region of 23-28 nm. Photoluminescence analysis at room temperature demonstrated strong enhancement of the visible emission from Sm 3+ , via energy transfer from the SnO2 host matrix to the dopant. The maximum emission efficiency was observed for a concentration of 1.5 atom % Sm 3+ .

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Section: Photoluminescence Sensitization Of Sm 3+ -Doped Sno2 Nanocrymentioning

confidence: 99%

Section: Photoluminescence Sensitization Of Sm 3+ -Doped Sno2 Nanocrymentioning

confidence: 99%

“…However a drawback of lanthanides is their weak absorption for direct excitation due to the spin-forbidden nature of f-f transitions, which limits their efficiency [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Synthesis and photoluminescent properties of Sm3+-doped SnO2 nanoparticles

Faustino

Foot

Kresiński

2016

Ceramics International

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Tunable Emissions of Upconversion Fluorescence for Security Applications

Yao

Tian

2018

Advanced Optical Materials

179

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The rampant appearance of counterfeiting has a serious adverse effect on every aspect in the global markets. Thus, the development of high‐tech security strategies has become an urgent challenge. Recently, lanthanide ions (Ln3+) doped materials open new avenues for concealing factual data and shield against counterfeiting because of their unique optical characteristics of color‐tunable emissions under near‐infrared excitation. The present review surveys the recent advances in Ln3+‐doped upconversion crystals (UCCs) as fluorescent functional inks toward designable and high‐level anti‐counterfeiting patterns and graphical encoding. The great achievements of fabrication of versatile security patterns can be ascribed to the combination of the single or multiple colorful UCCs with polymers, additives, and solvents. Moreover, the crucial factors including underlying mechanisms, synthetic methods of upconversion fluorescence materials, and the diverse printing technologies employed for patterning the fluorescence images have been highlighted, and the corresponding challenges and opportunities in this promising research area are presented. This review will help providing a fundamental understanding and guidance to rational design fluorescence optical labels based on Ln3+‐doped UCCs for broadening their applications in high‐level security fields.

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The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions

Villa

Moretti

Fasoli

et al. 2019

Advanced Optical Materials

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The recent trends in scintillator technologies stimulate research efforts toward the development of novel materials morphologies, such as nanoparticles, able to efficiently convert ionizing radiations into light. For example, scintillating nanoparticles attract great interest in medical oncological therapies. In this work, the structural and morphological properties of HfO2:Ti nanoparticles with Ti concentrations from 0.03 to 10 mol% and subjected to calcination up to 1000 °C are thoroughly characterized; moreover, X‐ray photoelectron spectroscopy reveals the incorporation of Ti in both Ti (III) and Ti (IV) chemical states in as prepared samples, while the exclusive presence of Ti(IV) is unambiguously identified in calcined nanoparticles. The optical emission under X‐ray excitation evidences an intense Ti (IV)‐related luminescence at 2.5 eV in high temperature calcined samples with a few microseconds scintillation lifetime, and efficiency comparable to that of Bi4Ge3O12 reference scintillator. Finally, the competitive role of defects in charge carriers capture is demonstrated by the monotonic increase of the 2.5 eV band during prolonged X‐ray irradiation, more evident for nanoparticles with titanium concentration below 1 mol%. HfO2:Ti may also find application in X‐ray triggered oncological therapies by using the Ti (IV)‐related bright radioluminescence to excite photosensitizer molecules for singlet oxygen generation.

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Optical spectroscopy of lanthanides doped in wide band-gap semiconductor nanocrystals

Cited by 64 publications

References 27 publications

Synthesis and photoluminescent properties of Sm3+-doped SnO2 nanoparticles

Synthesis and photoluminescent properties of Sm3+-doped SnO2 nanoparticles

Tunable Emissions of Upconversion Fluorescence for Security Applications

The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions

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Optical spectroscopy of lanthanides doped in wide band-gap semiconductor nanocrystals

Cited by 64 publications

References 27 publications

Synthesis and photoluminescent properties of Sm3+-doped SnO2 nanoparticles

Synthesis and photoluminescent properties of Sm3+-doped SnO2 nanoparticles

Tunable Emissions of Upconversion Fluorescence for Security Applications

The Bright X‐Ray Stimulated Luminescence of HfO2 Nanocrystals Activated by Ti Ions

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The Bright X‐Ray Stimulated Luminescence of HfO₂ Nanocrystals Activated by Ti Ions