Recent Progress in Rare Earth Micro/Nanocrystals: Soft Chemical Synthesis, Luminescent Properties, and Biomedical Applications

Gai, Shili; Li, Chunxia; Yang, Piaoping; Lin, Jun

doi:10.1021/cr4001594

Cited by 1,284 publications

(857 citation statements)

References 562 publications

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“…The composite with various concentrations of UC nanocrystals show similar decay time ( Supplementary Fig. 2), indicating the radiative energy transfer takes place predominately 43 .…”

Section: Resultsmentioning

confidence: 76%

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An upconverted photonic nonvolatile memory

et al. 2014

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Conventional flash memory devices are voltage driven and found to be unsafe for confidential data storage. To ensure the security of the stored data, there is a strong demand for developing novel nonvolatile memory technology for data encryption. Here we show a photonic flash memory device, based on upconversion nanocrystals, which is light driven with a particular narrow width of wavelength in addition to voltage bias. With the help of near-infrared light, we successfully manipulate the multilevel data storage of the flash memory device. These upconverted photonic flash memory devices exhibit high ON/OFF ratio, long retention time and excellent rewritable characteristics.

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“…The composite with various concentrations of UC nanocrystals show similar decay time ( Supplementary Fig. 2), indicating the radiative energy transfer takes place predominately 43 .…”

Section: Resultsmentioning

confidence: 76%

“…1. Comparison with the core indicates the thickness of the NaYF 4 shell is B3 nm, which provides an effective barrier to interactions with high-phonon energy environments and shield the core from non-radiative relaxation processes 43 . The oleate-caped nanocrystals are well dispersed in the polymer and form the nanocomposite solution.…”

Section: Resultsmentioning

confidence: 99%

An upconverted photonic nonvolatile memory

et al. 2014

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“…The phosphors often consist of host materials with complex composition doped with small amounts of the active light-emitting species, and are sensitive to phase-purity, crystallinity and impurities (Smet et al 2011). Hence, wet chemical synthesis methods are highly applicable for their synthesis (Gai et al 2014). The literature on phosphors prepared by modified Pechini methods is extensive, including host materials such as CaIn2O4 ), Ca8La2(PO4)6O2 (Shang et al 2012), YVO4 (Serra et al 2000), YNbO4 (Lü et al 2015) and SrZrO3 (Zhang et al 2008).…”

Section: Phosphorsmentioning

confidence: 99%

Modified Pechini Synthesis of Oxide Powders and Thin Films

Sunde

Grande

Einarsrud

2016

Handbook of Sol-Gel Science and Technology

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The modified Pechini method has become one of the most popular synthesis methods for complex oxide materials due to its simplicity and versatility. The method can be applied to synthesize nano-crystalline powders, bulk materials as well as oxide thin films. Here, we present a comprehensive review of the method with focus on the chemistry through the three stages of the process; preparation of stable aqueous solution, poly-esterification to form a solid polymeric resin and finally decomposition/combustion of the resin to form an amorphous oxide followed by crystallization of the desired oxide phase. The review include

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“…After the addition of NaOH and NH 4 F, ensure that the temperature is kept at 75 °C for a long enough period of time to completely distill off all of the methanol from the high boiling point solvent mixture and then raise the temperature to 300 °C as fast as possible after distillation to control the size of nanoparticles. 24 When making water-dispersible nanoassemblies, it can sometimes be challenging to determine the quantity of UCNPs (Step 2.2) and organic molecules (Step 2.6). One suggestion is to start with a small volume of the UCNPs (i.e.…”

Section: Discussionmentioning

confidence: 99%

“…[20][21][22][23] Lanthanide-doped NaYF 4 upconverting nanoparticles are useful for bio-imaging. 24 These nanoparticles absorb near-infrared light and emit light in several regions of the visible spectrum. Examples of fluorescence modulation by combining photoresponsive diarylethene chromophores and nanoparticles have been previously reported by our group.…”

Section: Introductionmentioning

confidence: 99%

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

Arafeh

Asadirad

et al. 2015

JoVE

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In this protocol, we first describe a procedure to synthesize lanthanide doped upconverting nanoparticles (UCNPs). We then demonstrate how to generate amphiphilic polymers in situ, and describe a protocol to encapsulate the prepared UCNPs and different organic dye molecules (porphyrins and diarylethenes) using polymer shells to form stable water-dispersible nanoassemblies. The nanoassembly samples containing both the UCNPs and the diarylethene organic dyes have interesting photochemical and photophysical properties. Upon 365 nm UV irradiation, the diarylethene group undergoes a visual color change. When the samples are irradiated with visible light of another specific wavelength, the color fades and the samples return to the initial colorless state. The samples also emit visible light from the UCNPs upon irradiation with 980 nm near-infrared light. The emission intensity of the samples can be tuned through alternate irradiation with UV and visible light. Modulation of fluorescence can be performed for many cycles without observable degradation of the samples. This versatile encapsulation procedure allows for the transfer of hydrophobic molecules and nanoparticles from an organic solvent to an aqueous medium. The polymer helps to maintain a lipid-like microenvironment for the organic molecules to aid in preservation of their photochemical behavior in water. Thus this method is ideal to prepare water-dispersible photoresponsive systems. The use of near-infrared light to activate upconverting nanoparticles allows for lower energy light to be used to activate photoreactions instead of more harmful ultraviolet light.

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Recent Progress in Rare Earth Micro/Nanocrystals: Soft Chemical Synthesis, Luminescent Properties, and Biomedical Applications

Cited by 1,284 publications

References 562 publications

An upconverted photonic nonvolatile memory

An upconverted photonic nonvolatile memory

Modified Pechini Synthesis of Oxide Powders and Thin Films

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

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