Photoluminescence characterization of porous YAG: Yb3+–Er3+ nanoparticles

Desirena, H.; Dı́az-Torres, L.A.; Rodrı́guez, R.A.; Meza, O.; Salas, P.; Ángeles–Chávez, C.; Tobar, E. H.; Castañeda-Contreras, J.; Rosa, E. De la

doi:10.1016/j.jlumin.2014.03.012

Cited by 20 publications

(14 citation statements)

References 35 publications

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“…( 4 I 9/2 + 4 I 13/2 ), results in shift of population from 4 S 3/2 to 4 I 13/2 level. [37,39] The higher concentrationo n 4 I 13/2 results in red emission, as explained previously.T hus the increase in Er 3 + ion concentration leads to quenching of green emission and enhancement of red emission.…”

Section: Resultssupporting

confidence: 68%

“…Higher dopant concentrations lead to a decrease in interionic distance, which results in dominance of the ET process and similarly lower dopant concentrations prefers ESA processes. Also, at higher dopant concentrations a cross‐relaxation (CR) process ( 4 S 3/2 + 4 I 15/2 )→( 4 I 9/2 + 4 I 13/2 ), results in shift of population from 4 S 3/2 to 4 I 13/2 level . The higher concentration on 4 I 13/2 results in red emission, as explained previously.…”

Section: Resultssupporting

confidence: 60%

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A Novel Approach to Synthesise a Dual‐Mode Luminescent Composite Pigment for Uncloneable High‐Security Codes to Combat Counterfeiting

Kanika

Kumar

Singh

et al. 2017

Chemistry A European J

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A strategy is demonstrated to protect valuable items, such as currency, pharmaceuticals, important documents, etc. against counterfeiting, by marking them with luminescent security codes. These luminescent security codes were printed by employing luminescent ink formulated from a cost effective dual-mode luminescent composite pigment of Gd Yb Er O and Zn Mn S phosphors using commercially available PVC Gold medium. In the composite, Gd Yb Er O and Zn Mn S account for upconversion and downconversion processes, respectively. The synthesis procedure of the composite involves the admixing of Gd Yb Er O nanorods and Zn Mn S phosphor, synthesised by hydrothermal and facile solid-state reaction methods, respectively. The structural, morphological, microstructural, and photoluminescent features of Gd Yb Er O nanorods, Zn Mn S phosphor and composite were characterised by using XRD, SEM, TEM, and photoluminescence (PL) techniques, respectively. The distribution of PL intensity of the printed pattern was examined by using confocal PL mapping microscopy. The obtained results reveal that security codes printed using ink formulated from this bi-luminescent composite pigment provide dual-stage security against counterfeiting.

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Section: Resultssupporting

confidence: 68%

Section: Resultssupporting

confidence: 60%

A Novel Approach to Synthesise a Dual‐Mode Luminescent Composite Pigment for Uncloneable High‐Security Codes to Combat Counterfeiting

Kanika

Kumar

Singh

et al. 2017

Chemistry A European J

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“…7 shows the near-infrared DC emission spectra of the Y 2 O 3 :Er 3þ , Yb 3þ nanoparticles prepared using the LA and SG methods under 976-nm diode laser excitation. The emission band centered at 1550 nm was assigned to the 4 I 13/2 (Er 3þ ) / 4 I 15/2 (Er 3þ ) transition [10,34]. In the LA samples, the 1550-nm intensity was very low, while no 1550-nm emission could be observed for the Er 3þ -single-doped sample.…”

Section: Fluorescence Decay Timementioning

confidence: 96%

Femtosecond-pulse laser-ablation-induced synthesis and improved emission properties of ultrafine Y2O3:Er3+, Yb3+ nanoparticles with reduced nonradiative relaxation

Zheng

Yang

Zhang

et al. 2015

Journal of Alloys and Compounds

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“…21 Upconversion photoluminescence (UCPL) emission with emission color tunability in nanocrystalline garnets is a subject of many studies. [22][23][24] The UCPL emission from Er 3+ -doped and/or Er 3+ /Yb 3+ -co-doped garnet hosts has been studied for example in Y 3 Al 5 O 12 25 and Gd 3 Al 5 O 12 . 26 These types of singly Er 3+ -doped garnets exhibit the intense green Er 3+ : 4 F 7/2 / 2 H 11/2 / 4 S 3/2 → 4 I 15/2 UCPL emission at a pumping wavelength of ≈980 nm.…”

Section: Introductionmentioning

confidence: 99%

Deep red upconversion photoluminescence in Er³⁺‐doped Yb₃Ga₅O₁₂ nanocrystalline garnet

et al. 2022

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The nanocrystalline single-phase Er 3+ -doped Yb 3 Ga 5 O 12 garnets have been prepared by the sol-gel combustion technique with a crystallite size of ≈30 nm. The presence of Yb 3+ in garnet hosts allows their efficient excitation at the ≈977 nm wavelength. The Er 3+ doping of Yb 3 Ga 5 O 12 garnet host results in deep red Er 3+ : 4 F 9/2 → 4 I 15/2 upconversion photoluminescence (UCPL) emission. The dominance of the red UCPL emission over the green Er 3+ : 4 F 7/2 / 2 H 11/2 / 4 S 3/2 → 4 I 15/2 component was investigated using the measurement of the steady-state and timedependent Er 3+ and Yb 3+ emission spectra in combination with the powerdependent UCPL emission intensity. The proposed upconversion mechanism is discussed in terms of the Er 3+ → Yb 3+ energy back transfer process as well as Yb 3+ (Er 3+ ) → Er 3+ energy transfer and Er 3+ ↔ Er 3+ cross-relaxation processes. The studied Er 3+ -doped Yb 3 Ga 5 O 12 garnet may be utilized as a red upconversion emitting phosphor.

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Photoluminescence characterization of porous YAG: Yb3+–Er3+ nanoparticles

Cited by 20 publications

References 35 publications

A Novel Approach to Synthesise a Dual‐Mode Luminescent Composite Pigment for Uncloneable High‐Security Codes to Combat Counterfeiting

A Novel Approach to Synthesise a Dual‐Mode Luminescent Composite Pigment for Uncloneable High‐Security Codes to Combat Counterfeiting

Femtosecond-pulse laser-ablation-induced synthesis and improved emission properties of ultrafine Y2O3:Er3+, Yb3+ nanoparticles with reduced nonradiative relaxation

Deep red upconversion photoluminescence in Er³⁺‐doped Yb₃Ga₅O₁₂ nanocrystalline garnet

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Photoluminescence characterization of porous YAG: Yb3+–Er3+ nanoparticles

Cited by 20 publications

References 35 publications

A Novel Approach to Synthesise a Dual‐Mode Luminescent Composite Pigment for Uncloneable High‐Security Codes to Combat Counterfeiting

A Novel Approach to Synthesise a Dual‐Mode Luminescent Composite Pigment for Uncloneable High‐Security Codes to Combat Counterfeiting

Femtosecond-pulse laser-ablation-induced synthesis and improved emission properties of ultrafine Y2O3:Er3+, Yb3+ nanoparticles with reduced nonradiative relaxation

Deep red upconversion photoluminescence in Er3+‐doped Yb3Ga5O12 nanocrystalline garnet

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Deep red upconversion photoluminescence in Er³⁺‐doped Yb₃Ga₅O₁₂ nanocrystalline garnet