Twofold advantage of gas bubbling for the advanced solvothermal preparation of efficient YAG:Ce nanophosphors

Cantarano, Alexandra; Testemale, Denis; Nobre, Sonia de Sousa; Potdevin, A.; Bruyère, Rémy; Barbara, Aude; Hazemann, Jean‐Louis; Ibanez, Alain; Dantelle, Géraldine

doi:10.1039/d0tc02347g

Cited by 11 publications

(4 citation statements)

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“…We recently reported the modified solvothermal synthesis of YAG nanocrystals . By combining high temperatures with steady high pressure, we managed to control the nucleation and growth mechanisms of YAG nanocrystals and obtained well-crystallized Ce 3+ -doped nanocrystals exhibiting internal quantum yields, around 50%, twice higher than those reported in previous works. , When doped with Nd 3+ , such nanocrystals exhibit a temperature-dependent fluorescence with a thermal sensitivity identical to the one of YAG:Nd 3+ crystals obtained by combustion. , Moreover, the crucial advantage of the solvothermal route is the formation of stable colloidal suspensions of YAG:Nd 3+ nanocrystals in ethanol, on the contrary to most of the other reported syntheses that lead to severe nanocrystal agglomeration induced by thermal treatments. , The challenge was still to transfer these nanocrystals into aqueous solutions for potential biological applications. Several strategies were reported in the literature, in the case of YAG nanocrystals, such as poly(ethylene glycol) (PEG) grafting, silanization, and use of a cosolvent during the synthesis to modify the nature of surface groups or mesoporous silica coating .…”

Section: Introductionmentioning

confidence: 93%

“…26 By combining high temperatures with steady high pressure, we managed to control the nucleation and growth mechanisms of YAG nanocrystals and obtained well-crystallized Ce 3+ -doped nanocrystals exhibiting internal quantum yields, around 50%, twice higher than those reported in previous works. 26,27 When doped with Nd 3+ , such nanocrystals exhibit a temperature-dependent fluorescence with a thermal sensitivity identical to the one of YAG:Nd 3+ crystals obtained by combustion. 28,29 Moreover, the crucial advantage of the solvothermal route is the formation of stable colloidal suspensions of YAG:Nd 3+ nanocrystals in ethanol, on the contrary to most of the other reported syntheses that lead to severe nanocrystal agglomeration induced by thermal treatments.…”

Section: Introductionmentioning

confidence: 94%

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Autofluorescence-Free In Vivo Imaging Using Polymer-Stabilized Nd³⁺-Doped YAG Nanocrystals

Cantarano

Yao

Matulionytė

et al. 2020

ACS Appl. Mater. Interfaces

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Neodymium-doped yttrium aluminum garnet (YAG:Nd 3+ ) has been widely developed during roughly the last sixty years and has been an outstanding fluorescent material.It has been considered as the gold standard among multipurpose solid-state lasers. Yet, the successful downsizing of this system into the nano regimen has been elusive, so far. Indeed, the synthesis of a garnet structure at the nanoscale, with enough crystalline quality for optical applications was found to be quite challenging. Here, we present an improved solvothermal synthesis method producing YAG:Nd 3+ nanocrystals of remarkably good structural quality.Adequate surface functionalization using asymmetric double-hydrophilic block copolymers, constituted of a metal-binding block and a neutral water soluble block, provides stabilized YAG:Nd 3+ nanocrystals with a long term colloidal stability in aqueous suspensions. These newly stabilized nanoprobes keep the spectroscopic quality (long lifetimes, narrow emission lines, and large Stokes shift) characteristic of bulk YAG:Nd 3+ . The narrow emission lines of YAG:Nd 3+ nanocrystals are exploited by differential infrared fluorescence imaging, thus achieving an autofluorescence-free in vivo readout. In addition, nanothermometry measurements, based on the ratiometric fluorescence of the stabilized YAG:Nd 3+ nanocrystals, are demonstrated. The progress here reported paves the way for the implementation of this new stabilized YAG:Nd 3+ system in the preclinical arena.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 94%

Autofluorescence-Free In Vivo Imaging Using Polymer-Stabilized Nd³⁺-Doped YAG Nanocrystals

Cantarano

Yao

Matulionytė

et al. 2020

ACS Appl. Mater. Interfaces

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“…To preserve the right oxidation state while elaborating NCs, more complex strategies should be proposed. A recent study proposes the bubbling of a reducing gas in a solution prior to solvothermal treatment, preventing partially the oxidation of Ce 3+ during the heat treatment (Cantarano et al, 2020).…”

Section: Garnet-type Nanophosphors Doped With Other Ln 3+ Ionsmentioning

confidence: 99%

Garnet-Type Nanophosphors for White LED Lighting

2020

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In this article we present a short review of the main wet chemical methods developed for the preparation of Ce 3+ -doped Y 3 Al 5 O 12 (YAG:Ce) nanocrystals for their use as nanophosphors in LED lighting technology: combustion, co-precipitation, sol-gel, modified-Péchini, and solvothermal routes. We highlight the key synthesis steps and discuss them in the view of the size, crystal quality, and agglomeration state of the obtained nanocrystals. The photoluminescence internal quantum yield of these nanocrystals is also discussed in light of their morphology. In addition, we report on other garnet-type nanophosphors [Gd 3 Sc 2 Al 3 O 12 , (Gd,Y) 3 Al 5 O 12 , etc.] doped with lanthanide ions (Ce 3+ , but also Eu 3+ or Dy 3+ ) developed with the goal of obtaining a warmer white light. The spectroscopic properties of these nanophosphors, in particular their emission range, is discussed in relation with the doping nature, doping concentration, and crystal field of the host matrices.

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“…Phosphor-converted white light-emitting diodes (LEDs), as the new generation solid lighting device, have been widely used in the field of display backlighting, streetlamps, headlamps and indoor illuminations, due to their high efficiency, long lifetime and energy conservation features [ 1 , 2 , 3 , 4 , 5 ]. LEDs are the most popular solid lighting device, which are composed of blue GaN chips and yellow YAG:Ce phosphor dispersed in organic resin [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Spray Pyrolysis Synthesis and Photoluminescence of LuAG:Ce Thin Films

et al. 2022

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LuAG:Ce (Lu3Al5O12:Ce) is one of the most important color converters in white lighting industry. Especially, LuAG:Ce film attracts more attention due to the outstanding advantages, such as the efficient heat dissipation, the saving of rare earth, and so on. Here, LuAG:Ce film on sapphire was successfully prepared by the ultrasonic spray pyrolysis process. The phase, microstructure and photoluminescence of LuAG:Ce films were investigated. LuAG:Ce films had a thickness of around 5 μm, which were well crystallized at 1000 °C in air atmosphere to form the typical garnet structure. Under the protection of CO atmosphere, increasing the annealing temperature greatly enhanced the photoluminescence performance. After annealing at 1500 °C for 5 h in CO atmosphere, 3.0 mol.% Ce3+ doped LuAG:Ce film exhibited the highest emission and excitation intensity. The emission intensity of 3.0 mol.% Ce3+ doped LuAG:Ce film annealed at 1500 °C in CO atmosphere increased up to five times, when compared with the best LuAG:Ce film annealed at 1000 °C in air atmosphere. The effects of Ce3+ doping concentration on the photoluminescence were also examined. As the Ce3+ doping concentration increased from 0.2 mol.% to 7.0 mol.%, the color of LuAG:Ce films changed from yellowish green to greenish yellow. When coupling the 3.0 mol.% Ce3+ doped LuAG:Ce film with a 0.5 W 450 nm blue laser, the formed device successfully emitted white light.

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Twofold advantage of gas bubbling for the advanced solvothermal preparation of efficient YAG:Ce nanophosphors

Abstract: Gas bubbles modify the nucleation, crystallinity and Ce oxidation state of YAG nanocrystals: towards very high photoluminescence yields.

Cited by 11 publications

References 61 publications

Autofluorescence-Free In Vivo Imaging Using Polymer-Stabilized Nd³⁺-Doped YAG Nanocrystals

Autofluorescence-Free In Vivo Imaging Using Polymer-Stabilized Nd³⁺-Doped YAG Nanocrystals

Garnet-Type Nanophosphors for White LED Lighting

Ultrasonic Spray Pyrolysis Synthesis and Photoluminescence of LuAG:Ce Thin Films

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Twofold advantage of gas bubbling for the advanced solvothermal preparation of efficient YAG:Ce nanophosphors

Abstract: Gas bubbles modify the nucleation, crystallinity and Ce oxidation state of YAG nanocrystals: towards very high photoluminescence yields.

Cited by 11 publications

References 61 publications

Autofluorescence-Free In Vivo Imaging Using Polymer-Stabilized Nd3+-Doped YAG Nanocrystals

Autofluorescence-Free In Vivo Imaging Using Polymer-Stabilized Nd3+-Doped YAG Nanocrystals

Garnet-Type Nanophosphors for White LED Lighting

Ultrasonic Spray Pyrolysis Synthesis and Photoluminescence of LuAG:Ce Thin Films

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Product

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Autofluorescence-Free In Vivo Imaging Using Polymer-Stabilized Nd³⁺-Doped YAG Nanocrystals

Autofluorescence-Free In Vivo Imaging Using Polymer-Stabilized Nd³⁺-Doped YAG Nanocrystals