Static and dynamic photoluminescence and photocatalytic properties of uniform, monodispersed up/down-converting, highly luminescent, lanthanide-ion-doped β-NaYF<sub>4</sub>phosphor microcrystals with controlled multiform morphologies

Padhye, Preeti; Poddar, Pankaj

doi:10.1039/c4ta04274c

Cited by 42 publications

(15 citation statements)

References 56 publications

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“…As disclosed in Figure S5b (Supporting Information), the Bi 5 IO 7 :0.07Er 3+ microparticles did not only exhibit an energy band gap at 2.89 eV but also showed an extra absorption edge at around 2.19 eV, which might be assigned to the doping of Er 3+ ions in the selected host lattice. [ 35 ] Furthermore, the E g value of the pure Bi 5 IO 7 microparticles was 2.89 eV (see Figure S5c, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic and Thermometric Characteristics of Er³⁺‐Activated Bi₅IO₇ Upconverting Microparticles

Luo

Ran

et al. 2020

Adv Materials Inter

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Series of Er3+‐activated Bi5IO7 upconverting microparticles are prepared by using a wet chemical technology along with a dedicated heating process. The electronic structure of the Bi5IO7 host is systematically studied by employing the first‐principle density functional theory. The near‐infrared (NIR) triggered upconversion (UC) behaviors of the prepared samples are studied and the optimal doping content for Er3+ ions is determined to be 7 mol%. The involved luminescent mechanism is verified by the pump power dependent UC emission spectra. Through the fluorescence intensity rate route based on the 2H11/2 and 4S3/2 thermally coupled levels, the thermometric properties of the final compounds are investigated in detail. The maximum absolute and relative sensor sensitivities of the resultant microparticles are 0.0069 K‐1 and 1.36% K‐1, respectively, importantly, these values are independent on the Er3+ ion content. The photocatalytic activity of the resultant microparticles are evaluated by analyzing the degradation of RhB under the irradiation of visible and NIR light. The results demonstrate that the Er3+‐activated Bi5IO7 microparticles are promising bifunctional platforms for optical thermometers and visible‐NIR light triggered photocatalysis.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic and Thermometric Characteristics of Er³⁺‐Activated Bi₅IO₇ Upconverting Microparticles

Luo

Ran

et al. 2020

Adv Materials Inter

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“…The emission spectra of Tb 3+ ions can be obtained at the excitation wavelength, λ ex = 375 nm. 34 The efficient emission is difficult to realize in the system containing Tb ions under direct excitation at 375 nm due to intraconfigurational parity-forbidden transitions. Hence, Gd 3+ ions act as a sensitizer (i.e., light-harvesting antenna) to enhance the luminescence of Tb 3+ ions.…”

Section: Resultsmentioning

confidence: 99%

Downconversion Luminescence-Based Nanosensor for Label-Free Detection of Explosives

2019

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We report a selective and sensitive nanosensor probe based on polyethylenimine (PEI)-capped downconverting nanophosphors β-NaYF 4 :Gd 3+ ,Tb 3+ @PEI for the detection of 2,4,6-trinitrotoluene (TNT), both in water and buffer media. These downconverting phosphors were synthesized via a hydrothermal route and are known to show excellent chemical, thermal, and photostability. They emit sharp emission peaks centered at ∼488, 544, 584, and 619 nm, among which the peak at ∼544 nm was remarkably quenched (∼90%) by the addition of TNT without giving any new emission peak. The sensing mechanism is based on the formation of a Meisenheimer complex between the electron-rich amine-functionalized β-NaYF 4 :Gd 3+ ,Tb 3+ nanophosphors and electron-deficient TNT molecule, which was prominently visualized by the change in the color of the solution from whitish to brownish yellow, enabling visual detection, followed by luminescence resonance energy transfer between the nanophosphors and the complex. A linear range for TNT detection was obtained from 0.1 to 300 μM with a limit of detection as low as 119.9 nM. This method displayed excellent selectivity toward TNT over other nitroaromatic compounds, which had no influence on the detection. Moreover, various other classes of analytes, viz., amino acids, pesticides, and sugars, did not quench the luminescence intensity of the nanophosphors. This developed nanosensor probe possesses high, stable fluorescence brightness and capability for the selective and sensitive on-site recognition of TNT molecules in aqueous media, avoiding complicated strategies and instruments. Thus, this work promises to pave ways to many applications in the detection of ultratrace analytes.

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“…Four prominent emission peaks centered at ∼488, ∼544, ∼584, and ∼619 nm originate from the transitions of 5 D 4 → 7 F 6 , 5 D 4 → 7 F 5 , 5 D 4 → 7 F 4 , and 5 D 4 → 7 F 3 , respectively. 22,62,63 The mechanism for DC in Gd 3+ –Tb 3+ pair under excitation of 273 nm has been demonstrated in Figure S4 (Supporting Information). Among these transitions, the green emission 5 D 4 → 7 F 5 at ∼544 nm is the most intense emission, which corresponds to a magnetic dipole transition.…”

Section: Resultsmentioning

confidence: 99%

Graphene Quantum Dots-Driven Multiform Morphologies of β-NaYF₄:Gd³⁺/Tb³⁺ Phosphors: The Underlying Mechanism and Their Optical Properties

2018

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Dimension and shape tunable architectures of inorganic crystals are of extreme interest because of morphology-dependent modulation of the properties of the materials. Herein, for the first time, we present a novel impurity-driven strategy where we studied the influence of in situ incorporation of graphene quantum dots (GQDs) on the growth of β-NaYF 4 :Gd 3+ /Tb 3+ phosphor crystals via a hydrothermal route. The GQDs function as a nucleation site and by changing the concentration of GQDs, the morphology of β-NaYF 4 :Gd 3+ /Tb 3+ phosphors was changed from rod to flowerlike structure to disklike structure, without phase transformation. The influence of size and functionalization of GQDs on the size and shape of phosphor crystals were also systematically studied and discussed. Plausible mechanisms of formation of multiform morphologies are proposed based on the heterogeneous nucleation and growth. Most interestingly, the experimental results indicate that the photoluminescence properties of β-NaYF 4 :Gd 3+ /Tb 3+ phosphor crystals are strongly dependent on the crystallite size and morphology. This study would be suggestive for the precisely controlled growth of inorganic crystals; consequently, it will open new avenues and thus may possess potential applications in the field of materials and biological sciences.

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Static and dynamic photoluminescence and photocatalytic properties of uniform, monodispersed up/down-converting, highly luminescent, lanthanide-ion-doped β-NaYF₄phosphor microcrystals with controlled multiform morphologies

Abstract: Optical and photocatalytic properties of β-NaYF4:5% Tb3+ phosphor crystals with multiform morphologies fabricated via a binary capping agent system.

Cited by 42 publications

References 56 publications

Photocatalytic and Thermometric Characteristics of Er³⁺‐Activated Bi₅IO₇ Upconverting Microparticles

Photocatalytic and Thermometric Characteristics of Er³⁺‐Activated Bi₅IO₇ Upconverting Microparticles

Downconversion Luminescence-Based Nanosensor for Label-Free Detection of Explosives

Graphene Quantum Dots-Driven Multiform Morphologies of β-NaYF₄:Gd³⁺/Tb³⁺ Phosphors: The Underlying Mechanism and Their Optical Properties

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Static and dynamic photoluminescence and photocatalytic properties of uniform, monodispersed up/down-converting, highly luminescent, lanthanide-ion-doped β-NaYF4phosphor microcrystals with controlled multiform morphologies

Abstract: Optical and photocatalytic properties of β-NaYF4:5% Tb3+ phosphor crystals with multiform morphologies fabricated via a binary capping agent system.

Cited by 42 publications

References 56 publications

Photocatalytic and Thermometric Characteristics of Er3+‐Activated Bi5IO7 Upconverting Microparticles

Photocatalytic and Thermometric Characteristics of Er3+‐Activated Bi5IO7 Upconverting Microparticles

Downconversion Luminescence-Based Nanosensor for Label-Free Detection of Explosives

Graphene Quantum Dots-Driven Multiform Morphologies of β-NaYF4:Gd3+/Tb3+ Phosphors: The Underlying Mechanism and Their Optical Properties

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Static and dynamic photoluminescence and photocatalytic properties of uniform, monodispersed up/down-converting, highly luminescent, lanthanide-ion-doped β-NaYF₄phosphor microcrystals with controlled multiform morphologies

Photocatalytic and Thermometric Characteristics of Er³⁺‐Activated Bi₅IO₇ Upconverting Microparticles

Photocatalytic and Thermometric Characteristics of Er³⁺‐Activated Bi₅IO₇ Upconverting Microparticles

Graphene Quantum Dots-Driven Multiform Morphologies of β-NaYF₄:Gd³⁺/Tb³⁺ Phosphors: The Underlying Mechanism and Their Optical Properties