Control of green and red upconversion in NaYF4:Yb3+,Er3+ nanoparticles by excitation modulation

Gainer, Christian F.; Joshua, Gihan S.; Silva, Channa R. De; Romanowski, Marek

doi:10.1039/c1jm13684d

Cited by 69 publications

(59 citation statements)

References 21 publications

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“…For this reason, the number of NIR photons involved in the UC process can be calculated from a function of emission intensity against excitation density. 192,193 Due to the effects of thermal annealing and laser irradiation, giant enhancements up to 2 to 3 orders of magnitude in emission intensity of NaYF 4 :Yb/Er nanocrystals have been reported by two independent research groups. Note that with increasing power density, the saturation of excitation is usually observed from lanthanide-doped nanocrystals, illustrating the cooperative effect of sensitizers and activators on the UC process.…”

Section: Excitation By Continuous-wave (Cw) Lasermentioning

confidence: 99%

Probing the nature of upconversion nanocrystals: instrumentation matters

et al. 2015

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Probing the nature of nanocrystalline materials such as the surface state, crystal structure, morphology, composition, optical and magnetic characteristics is a crucial step in understanding their chemical and physical performance and in exploring their potential applications. Upconversion nanocrystals have recently attracted remarkable interest due to their unique nonlinear optical properties capable of converting incident near-infrared photons to visible and even ultraviolet emissions. These optical nanomaterials also hold great promise for a broad range of applications spanning from biolabeling to optoelectronic devices. In this review, we overview the instrumentation techniques commonly utilized for the characterization of upconversion nanocrystals. A considerable emphasis is placed on the analytical tools for probing the optical properties of the luminescent nanocrystals. The advantages and limitations of each analytical technique are compared in an effort to provide a general guideline, allowing optimal conditions to be employed for the characterization of such nanocrystals. Parallel efforts are devoted to new strategies that utilize a combination of advanced emerging tools to characterize such nanosized phosphors.

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Section: Excitation By Continuous-wave (Cw) Lasermentioning

confidence: 99%

Probing the nature of upconversion nanocrystals: instrumentation matters

et al. 2015

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“…10,11 We have recently reported an additional means of controlling the ratio of green to red emission (GRR) in cubic phase NaYF 4 :Yb 3+ , Er 3+ through excitation repetition rate and pulse duration. 12 Herein, we discuss control of the GRR in hexagonal phase UNPs, which exhibit as much as 10-fold increased green luminescence efficiency over their cubic phase counterparts 3 and explore the use of this phenomenon in super resolution microscopy.…”

Section: Introductionmentioning

confidence: 99%

Toward the use of two-color emission control in upconverting NaYF4:Er3+,Yb3+ nanoparticles for biomedical imaging

Gainer

Joshua

Romanowski

2012

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII

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In the interest of generating new biomedical sensing techniques as well as improving those that currently exist, a great deal of attention has been given to upconverting lanthanide nanoparticles in recent years. In order to develop these nanoparticles for use in multiplexed and ratiometric sensing techniques, many recent studies have focused on experimental control of their emission wavelengths. Here we describe a new method for controlling the relative intensity of green and red emission bands in NaYF4:Yb3+, Er3+ nanoparticles via control of the excitation pulse repetition rate. Using this method, particles of the same composition may be tuned to produce red and green light in user-defined ratios. We discuss the mechanism behind this control as well as potential applications that could make use of this property, specifically in super resolution imaging techniques.

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“…This has led to some less successful attempts to utilize pulsed excitation for UCNPs in the past. 22,23 It is thus necessary to carefully consider the excitation dynamics of UC emissions under pulsed excitation in order to utilize the higher intrinsic QY of UCNPs.…”

Section: Introductionmentioning

confidence: 99%

Deep tissue optical imaging of upconverting nanoparticles enabled by exploiting higher intrinsic quantum yield through use of millisecond single pulse excitation with high peak power

Liu

Dumlupinar

et al. 2013

Nanoscale

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-Engels, S. (2013). Deep tissue optical imaging of upconverting nanoparticles enabled by exploiting higher intrinsic quantum yield through use of millisecond single pulse excitation with high peak power. Nanoscale, 5(20), 10034-10040. https://doi.org/10.1039/c3nr01917aRegistered Charity Number 207890 Accepted ManuscriptThis is an Accepted Manuscript, which has been through the RSC Publishing peer review process and has been accepted for publication.Accepted Manuscripts are published online shortly after acceptance, which is prior to technical editing, formatting and proof reading. This free service from RSC Publishing allows authors to make their results available to the community, in citable form, before publication of the edited article. This Accepted Manuscript will be replaced by the edited and formatted Advance Article as soon as this is available.To cite this manuscript please use its permanent Digital Object Identifier (DOI®), which is identical for all formats of publication.More information about Accepted Manuscripts can be found in the Information for Authors.Please note that technical editing may introduce minor changes to the text and/or graphics contained in the manuscript submitted by the author(s) which may alter content, and that the standard Terms & Conditions and the ethical guidelines that apply to the journal are still applicable. In no event shall the RSC be held responsible for any errors or omissions in these Accepted Manuscript manuscripts or any consequences arising from the use of any information contained in them. We have accomplished deep tissue optical imaging of upconverting nanoparticles at 800 nm, using millisecond single pulse excitation with high peak power. This is achieved by carefully choosing the pulse parameters, derived from time-resolved rateequation analysis, which result in higher intrinsic quantum yield that is utilized by upconverting nanoparticles for generating this near infrared upconversion emission. The pulsed excitation approach thus promises previously unreachable imaging depths and shorter data acquisition times compared with continuous wave excitation, while simultaneously keeping the possible thermal side-effects of the excitation light moderate. These key results facilitate means to break through the general shallow depth limit of upconverting-nanoparticle-based fluorescence techniques, necessary for a range of biomedical applications, including diffuse optical imaging, photodynamic therapy and remote activation of biomolecules in deep tissues. www.rsc.org/nanoscale

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Control of green and red upconversion in NaYF4:Yb3+,Er3+ nanoparticles by excitation modulation

Cited by 69 publications

References 21 publications

Probing the nature of upconversion nanocrystals: instrumentation matters

Probing the nature of upconversion nanocrystals: instrumentation matters

Toward the use of two-color emission control in upconverting NaYF<sub>4</sub>:Er<sup>3+</sup>,Yb<sup>3+</sup> nanoparticles for biomedical imaging

Deep tissue optical imaging of upconverting nanoparticles enabled by exploiting higher intrinsic quantum yield through use of millisecond single pulse excitation with high peak power

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Control of green and red upconversion in NaYF4:Yb3+,Er3+ nanoparticles by excitation modulation

Cited by 69 publications

References 21 publications

Probing the nature of upconversion nanocrystals: instrumentation matters

Probing the nature of upconversion nanocrystals: instrumentation matters

Toward the use of two-color emission control in upconverting NaYF&lt;sub&gt;4&lt;/sub&gt;:Er&lt;sup&gt;3+&lt;/sup&gt;,Yb&lt;sup&gt;3+&lt;/sup&gt; nanoparticles for biomedical imaging

Deep tissue optical imaging of upconverting nanoparticles enabled by exploiting higher intrinsic quantum yield through use of millisecond single pulse excitation with high peak power

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Toward the use of two-color emission control in upconverting NaYF<sub>4</sub>:Er<sup>3+</sup>,Yb<sup>3+</sup> nanoparticles for biomedical imaging