Cation Exchange: A Facile Method To Make NaYF<sub>4</sub>:Yb,Tm-NaGdF<sub>4</sub> Core–Shell Nanoparticles with a Thin, Tunable, and Uniform Shell

Dong, Cunhai; Korinek, Andreas; Błasiak, Barbara; Tomanek, Bogusław; Veggel, Frank C. J. M. van

doi:10.1021/cm2036844

Cited by 154 publications

(119 citation statements)

References 40 publications

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“…Although the doping of Mn 4 þ has been realized in oxide compounds through solid-state reaction at high temperature, it is unpractical for synthesizing Mn 4 þ -activated fluoride compounds through this route because hazard and corrosive HF gas was used to prevent the oxidation of products 40 . In contrast, cation exchange reaction has been proved to be a convenient method for lanthanide doping in nano-sized fluoride crystals 41,42 . It was well established that efficient cation exchange can only take place in nano-sized materials 43,44 .…”

Section: Resultsmentioning

confidence: 99%

Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes

et al. 2014

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Mn 4 þ -activated fluoride compounds, as an alternative to commercial (oxy)nitride phosphors, are emerging as a new class of non-rare-earth red phosphors for high-efficacy warm white LEDs. Currently, it remains a challenge to synthesize these phosphors with high photoluminescence quantum yields through a convenient chemical route. Herein we propose a general but convenient strategy based on efficient cation exchange reaction, which had been originally regarded only effective in synthesizing nano-sized materials before, for the synthesis of Mn 4 þ -activated fluoride microcrystals such as K 2 TiF 6 , K 2 SiF 6 , NaGdF 4 and NaYF 4 . Particularly we achieve a photoluminescence quantum yield as high as 98% for K 2 TiF 6 :Mn 4 þ . By employing it as red phosphor, we fabricate a high-performance white LED with low correlated colour temperature (3,556 K), high-colour-rendering index (R a ¼ 81) and luminous efficacy of 116 lm W À 1 . These findings show great promise of K 2 TiF 6 :Mn 4 þ as a commercial red phosphor in warm white LEDs, and open up new avenues for the exploration of novel non-rare-earth red emitting phosphors.

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Section: Resultsmentioning

confidence: 99%

Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes

et al. 2014

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“…[29][30][31][32][33][34][35] Recently, cation exchange has been developed to prepare core-shell particles. Dong et al [36] reported a cation exchange route for the upconversion of NaYF 4 :Yb,Tm nanoparticles, resulting in NaYF 4 :Yb,Tm-NaGdF 4 core-shell nanoparticles. Similarly, Zhang et al [37] reported the transformation of singlecrystalline cadmium sulfide nanowires into composition-controlled Zn x Cd (1-x) S nanowires, core-shell heterostructures, metal-semiconductor superlattices (Zn-Zn x Cd (1-x) S), single-crystalline ZnS nanotubes, and even metallic Zn nanowires.…”

Section: Introductionmentioning

confidence: 99%

Aluminum Insertion‐Induced Enhanced Performance of Li(Ni_0.83‐xCo_0.10Mn_0.07Al_y)O₂ Microspheres for Lithium‐Ion Batteries Design

Chen¹,

Zhao²,

Li³

et al. 2013

ChemElectroChem

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An effective and facile strategy to synthesize spherical Li(Ni0.83‐xCo0.10Mn0.07Aly)O2 with a metal concentration gradient is presented. Spherical‐shaped Ni0.83Co0.10Mn0.07(OH)2 with hierarchical microstructure is used as the precursor. Al3+ inserts into Ni0.83Co0.10Mn0.07(OH)2 by replacing Ni2+ in Ni0.83Co0.10Mn0.07(OH)2 microspheres, resulting in a gradient distribution of Al and Ni within the microspheres. The Ni concentration decreases linearly, whereas the Al concentration increases linearly from the center to the outer layer of each particle. However, the distribution of Mn and Co is nearly uniform throughout the whole particle. This result is verified by using energy‐dispersive X‐ray mapping, line scanning, and inductively‐coupled plasma spectrometry. Electrochemical tests are carried out by using the as‐synthesized samples as positive‐electrode materials in lithium‐ion batteries. Results show that the discharge capacity, cyclability, and rate performance of these samples are clearly enhanced with respect to those of the untreated sample. The specific discharge capacity of the obtained sample at a discharge current of 0.1 C reaches 203.4 mAh g−1, whereas the modified material depicts a much higher specific capacity of 141.7 mAh g−1 during the 30th cycle, compared with only 80.8 mAh g−1 for the untreated sample. In addition, a series of materials with different Ni/Al ratios are synthesized by using this approach, for which the adjusted reaction parameters also affect their electrochemical properties. This simple synthetic strategy may be extended to construct nano‐/microsized particles with concentration gradients, offering new opportunities to study the composition‐dependent phenomena at the nano‐/microscale, as well as to provide a way of tuning the chemical/physical properties.

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“…18 Typically, in a 100 mL three-neck O] were added, followed by the addition of 6 mL oleic acid and 15 mL octadecene. After a 30 min stirring under argon flowing at room temperature, this mixture was heated to 160 uC for 30 min to make a clear solution.…”

Section: Synthesis Of Nayf 4 :Yb Tm Core Ucnpsmentioning

confidence: 99%

Facile synthesis of NaYF4:Yb, Ln/NaYF4:Yb core/shell upconversion nanoparticles via successive ion layer adsorption and one-pot reaction technique

Zeng¹,

Xue²,

Zhang³

et al. 2013

CrystEngComm

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Facile synthesis of NaYF4:Yb, Ln/NaYF4:Yb core/shell upconversion nanoparticles via successive ion layer adsorption and one-pot reaction technique Zeng, Q.; Xue, B.; Zhang, Y.; Wang, D.; Liu, X.; Tu, L.; Zhao, H.; Kong, X.; Zhang, H.. (2013). Facile synthesis of NaYF4:Yb, Ln/NaYF4:Yb core/shell upconversion nanoparticles via successive ion layer adsorption and one-pot reaction technique. CrystEngComm, 15(23), 4765-4772. The facile one-pot synthesis of NaYF 4 :Yb, Ln/NaYF 4 :Yb core/shell (CS) upconversion nanoparticles (UCNPs) was firstly developed through the successive ion layer adsorption and reaction (SILAR) technique, which represents an attractive alternative to conventional synthesis utilizing the chloride of Ln as the precursors, where the Ln doped NaYF 4 core was firstly purified and then an epitaxial shell of the desired thickness was obtained by the injection of shell precursors to a solution of the purified NaYF 4 core. The temperature-dependent shell growth mechanism and upconversion luminescent properties were explored thoroughly. A temperature of 280 uC proved to be the optimal shell growth temperature to prepare the compact CS structure with the highest luminescent enhanced efficiency for this preparative system. The shell thickness could be easily tuned using this SILAR technique from about 3 monolayers (ML) to 44 ML. The UC luminescent intensity was found to be increased with increasing shell thickness, and at last the effect of surface on the PL could be completely excluded by an appropriate shell thickness. Furthermore, the performance of the SILAR technique was also demonstrated by comparing Tm 3+ and Er 3+ doped separately in the core and shell with the Ln ions co-doped in the core.

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Cation Exchange: A Facile Method To Make NaYF₄:Yb,Tm-NaGdF₄ Core–Shell Nanoparticles with a Thin, Tunable, and Uniform Shell

Cited by 154 publications

References 40 publications

Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes

Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes

Aluminum Insertion‐Induced Enhanced Performance of Li(Ni_0.83‐xCo_0.10Mn_0.07Al_y)O₂ Microspheres for Lithium‐Ion Batteries Design

Facile synthesis of NaYF4:Yb, Ln/NaYF4:Yb core/shell upconversion nanoparticles via successive ion layer adsorption and one-pot reaction technique

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Cation Exchange: A Facile Method To Make NaYF4:Yb,Tm-NaGdF4 Core–Shell Nanoparticles with a Thin, Tunable, and Uniform Shell

Cited by 154 publications

References 40 publications

Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes

Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes

Aluminum Insertion‐Induced Enhanced Performance of Li(Ni0.83‐xCo0.10Mn0.07Aly)O2 Microspheres for Lithium‐Ion Batteries Design

Facile synthesis of NaYF4:Yb, Ln/NaYF4:Yb core/shell upconversion nanoparticles via successive ion layer adsorption and one-pot reaction technique

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Product

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Cation Exchange: A Facile Method To Make NaYF₄:Yb,Tm-NaGdF₄ Core–Shell Nanoparticles with a Thin, Tunable, and Uniform Shell

Aluminum Insertion‐Induced Enhanced Performance of Li(Ni_0.83‐xCo_0.10Mn_0.07Al_y)O₂ Microspheres for Lithium‐Ion Batteries Design