Thermoresponsive low-power light upconverting polymer nanoparticles

Thévenaz, David C.; Monguzzi, Angelo; Vanhecke, Dimitri; Vadrucci, Roberto; Meinardi, Francesco; Simon, Yoan C.; Weder, Christoph

doi:10.1039/c6mh00290k

Cited by 40 publications

(44 citation statements)

References 38 publications

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“…2a ), which was equivalent to the amplification of positive diffusion effect. Notably, our design pushed the limit of thermosensitive TTA system where phase transition or polymer-chain softening was generally required to enhance the diffusion effect 24 , 28 , 29 , 33 . Consequently, for the BDM & PtTPBP directly in liquid solvent, a continuous enhancement of TTA-UCL was achieved from 10 to 60 °C (Fig.…”

Section: Resultsmentioning

confidence: 99%

Ratiometric nanothermometer in vivo based on triplet sensitized upconversion

et al. 2018

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Temperature is an essential factor that counts for living systems where complicated vital activities are usually temperature dependent. In vivo temperature mapping based on non-contact optical approach will be beneficial for revealing the physiological phenomena behind with minimized influence to the organism. Herein, a highly thermal-sensitive upconversion system based on triplet–triplet annihilation (TTA) mechanism is pioneered to indicate body temperature variation sensitively over the physiological temperature range. The temperature-insensitive NaYF4: Nd nanophosphors with NIR emission was incorporated into the temperature-responsive TTA-upconversion system to serve as an internal calibration unit. Consequently, a ratiometric thermometer capable of accurately monitoring the temperature changes in vivo was developed with high thermal sensitivity (~7.1% K−1) and resolution (~0.1 K).

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Section: Resultsmentioning

confidence: 99%

Ratiometric nanothermometer in vivo based on triplet sensitized upconversion

et al. 2018

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“…Theg roup of Simon and Weder reported thermoresponsive polymer nanoparticles based on the temperature-dependent decay rate of the emitter triplet. [48] Then anoparticles were prepared by amicroemulsion technique in the presence of asurfactant and consist of the sensitizer PtOEP and alowmolecular-weight poly(e-caprolactone) that was end-functionalized with the emitter DPA(DPA-PCL-OH). When the temperature of the aqueous nanoparticle suspension was increased from 20 to 60 8 8C, the TTA-UC emission intensity dropped rapidly,a nd this process was fully reversible.…”

Section: Minireviewsmentioning

confidence: 99%

“…To expand the scope of TTA-UC to sensing applications,i ti sp ivotal to develop at oolbox of mechanisms to make TTA-UC responsive to avariety of external stimuli. TTA-UC emission has been successfully regulated by external stimuli including temperature, [46][47][48][49][50][51][52][53][54][55] oxygen, [56] light, [57] mechanical force, [58] electric field, [59] and chemicals. [60][61][62] However,t here has been no systematic understanding of the underlying mechanisms to switch TTA-UC.…”

Section: Introductionmentioning

confidence: 99%

Stimuli‐Responsive Molecular Photon Upconversion

Yanai

Kimizuka

2020

Angew Chem Int Ed

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The addition of stimuli‐responsiveness to anti‐Stokes emission provides a unique platform for biosensing and chemosensing. Particularly, stimuli‐responsive photon upconversion based on triplet–triplet annihilation (TTA‐UC) is promising due to its occurrence at low excitation intensity with high efficiency. This Minireview summarizes the recent developments of TTA‐UC switching by external stimuli such as temperature, oxygen, chemicals, light, electric field, and mechanical force. For the systematic understanding of the underlying general mechanisms, the switching mechanisms are categorized into four types: 1) aggregation‐induced UC; 2) assembly‐induced air‐stable UC; 3) diffusion‐controlled UC; and 4) energy‐transfer‐controlled UC. The development of stimuli‐responsive smart TTA‐UC systems would enable sensing with unprecedented sensitivity and selectivity, and expand the scope of TTA‐UC photochemistry by combination with supramolecular chemistry, materials chemistry, mechanochemistry, and biochemistry.

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“…The temperature dependence of several aspects of upconversion have been demonstrated. 53,[55][56][57][58] The temperature/k 2 relationship (6) is ubiquitous in chemistry but, to our knowledge, has not been directly tested with photochemical upconversion. k 2 is an important parameter to maximize in order to achieve overall efficiency.…”

Section: Annihilation Ratementioning

confidence: 99%

Photochemical Upconversion Light Emitting Diode (LED): Theory of Triplet Annihilation Enhanced by a Cavity

Frazer

2018

Advcd Theory and Sims

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Artificial lighting is a widespread technology which consumes large amounts of energy. Triplet-triplet annihilation photochemical upconversion is a method of converting light to a higher frequency. Here, it is shown theoretically that photochemical upconversion can be applied to Watt-scale lighting, with performance closely approaching the 50% quantum yield upper limit. The dynamic equilibrium of an efficient device consisting of an LED, an upconverting material, and an optical cavity is described from optical and thermal perspectives.

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Thermoresponsive low-power light upconverting polymer nanoparticles

Abstract: Low-power upconverting nanoparticles are presented that display highly efficient, temperature-dependent green to blue upconversion under aerated aqueous conditions. These features are useful for live cell and in vivo temperature sensing.

Cited by 40 publications

References 38 publications

Ratiometric nanothermometer in vivo based on triplet sensitized upconversion

Ratiometric nanothermometer in vivo based on triplet sensitized upconversion

Stimuli‐Responsive Molecular Photon Upconversion

Photochemical Upconversion Light Emitting Diode (LED): Theory of Triplet Annihilation Enhanced by a Cavity

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