Energy transfer in lanthanide upconversion studies for extended optical applications

Dong, Hao; Sun, Ling‐Dong; Yan, Chun‐Hua

doi:10.1039/c4cs00188e

Cited by 880 publications

(573 citation statements)

References 225 publications

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“…Inherited from the studies on fluorescent dyes and quantum dots, optical multiplexing strategies using UCNPs have been developed in the spectral domain 7,[24][25][26][27] , time domain 28 and spatial domain 29,30 . However, studies of the complex luminescence mechanisms involving sequential multi-step photophysical and energy transfer processes featuring complex luminescence kinetics are still at their infancy [31][32][33][34] , and may open possibility to develope unique multiplexing strategies in other domains.…”

Section: Introductionmentioning

confidence: 99%

Phase angle encoded upconversion luminescent nanocrystals for multiplexing applications

et al. 2017

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Lanthanide-doped upconversion nanoparticles (UCNPs) are increasingly used as luminescent candidates in multiplexed applications due to their excellent optical properties. Inthepast,several encodingidentities havebeen proposedforUCNPs,includingemissioncolour,intensity ratio between different emissionbands, colourspatial distribution, and luminescencelifetime.In this paper, a new optical encoding dimension for upconversion nanomaterials is developed by exploring their luminescence kinetics, i.e., the phase angle of upconversion luminescence in response to a harmonic-wave excitation. Our theoretical derivation shows that the phase angle is governed jointly by the rise and decay times, characterizing the upconversion luminescence kinetics. Experimentally, a full set of methods are developed to manage the upconversion luminescence kinetics, through which the rise and decay times can be manipulated dependently or independently. Furthermore,a large phase-angle space is achieved in which tens of unique codes can be potentially generated in the same colour channel. Our work greatly extends the multiplexing capacity of UCNPs,and offers newopportunities for their applicationsin a wide range such as microarray assays, bioimaging, anti-counterfeiting, deep tissue multiplexed labelling/detectionand high-density data storage.In addition, the development of thisluminescence kinetics-based optical encoding strategy is also instructive for developing multiplexing techniques using other cascade luminescent systems that inherently lack multi-spectral channels, such as triplet-triplet annihilation molecule pairs.

QC 20170330

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Section: Introductionmentioning

confidence: 99%

Phase angle encoded upconversion luminescent nanocrystals for multiplexing applications

et al. 2017

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QC 20170330

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“…[28][29][30][31][32][33][34][35][36][37][38] UCNPs are promising energy donors for luminescence resonance energy transfer (LRET)-based fluorescence probes, in which a specific target recognizing moiety acts as the energy acceptor and quenches the luminescence of UCNPs. The target-induced recovery of UCNPs luminescence can provide turn-on signals, with the sensitivity predominantly dependent on the quenching efficiency.…”

Section: Introductionmentioning

confidence: 99%

A Rationally Designed Upconversion Nanoprobe for in Vivo Detection of Hydroxyl Radical

et al. 2015

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The detection of •OH in live organisms is crucial to the understanding of its physiological and pathological roles; while this is too challenging because of the extremely low concentration and high reactivity of the species in the body. Herein, we report the rational design and fabrication of an NIR-light excited luminescence resonance energy transfer-based nanoprobe, which for the first time realizes the in vivo detection of •OH. The nanoprobe is composed of two moieties: upconversion nanoparticles with sandwich structure and bared surface as the energy donor; and mOG, a modified azo dye with tunable light absorption, as both the energy acceptor and the •OH recognizing ligand. The as-constructed nanoprobe exhibited ultrahigh sensitivity (with the quantification limit down to 1.2 femtomolar, several orders of magnitude lower than that of most previous •OH probes), good biocompatibility, and specificity. It was successfully used for monitoring [•OH] levels in live cells and tissues.

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“…5 However, one of the drawbacks of the above RE 3+ ions is that they have low absorption cross-sections for 4f-4f transitions, which result in the low luminescence intensity for these transitions. 6 Yb 3+ ions are commonly used as sensitizers in UC luminescence materials due to their relatively large absorption cross-section at 980 nm, leading to efficient absorption of infrared (IR) or near-infrared (NIR) pump photons and subsequently transfer their harvest energy to neighboring activator ions. 7 Although there exists an effective energytransfer (ET) from Yb 3+ to Er 3+ /Tm 3+ /Ho 3+ , the UC luminescence intensity of this type of material is still inadequate, which greatly limits their applications.…”

Section: 2mentioning

confidence: 99%

Upconversion luminescence enhancement and temperature sensing behavior of F⁻ co-doped Ba₃Lu₄O₉:Er³⁺/Yb³⁺ phosphors

Liu

Zhou

et al. 2017

RSC Adv.

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A series of Ba 3 Lu 4 O 9 :Er 3+ /Yb 3+ (EYBLO) phosphors co-doped with F À ions were synthesized by a simple solid-state reaction method. The results showed that the primary rhombohedral structure was maintained and the crystal lattice began to shrink when F À ions were introduced into the host matrix to occupy the O 2À site. The agglomerations and the impurities (OH À and CO 2 ) with higher phonon energy on the sample surface could be minimized and the sample crystallinity could be improved. Under 980 nm laser diode excitation, the green and red UC emissions of the EYBLO:0.4F À sample show nearly 5-and 7.5-fold enhancements in contrast to F À -free EYBLO. The upconversion luminescence can be finely tuned from yellow to red light to some extent by increasing F À concentration. Based on pumppower dependence and decay lifetime analysis, the energy level diagram was illustrated and the upconversion energy-transfer mechanism was discussed. The green and red emission enhancements are attributed to the modification of the local crystal field of Er 3+ ions and reduction of crystal site symmetry.The cross-relaxation and back-energy-transfer processes play an important role to enhance the red/ green UC emission intensity ratios. The fluorescence intensity ratio technique was employed to investigate the temperature sensing behavior of the synthesized phosphors. The temperature sensing properties can be enhanced by doping of F À ions, and the maximum sensitivity is found to be 44.57 Â 10 À4 K À1 at 523 K. It is promising to provide an alternative approach for enhancing UC luminescence and the temperature sensitivity in oxide matrixes and then obtain high-quality optical temperature-sensing materials by simply co-doping F À ions.

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Energy transfer in lanthanide upconversion studies for extended optical applications

Cited by 880 publications

References 225 publications

Phase angle encoded upconversion luminescent nanocrystals for multiplexing applications

Phase angle encoded upconversion luminescent nanocrystals for multiplexing applications

A Rationally Designed Upconversion Nanoprobe for in Vivo Detection of Hydroxyl Radical

Upconversion luminescence enhancement and temperature sensing behavior of F⁻ co-doped Ba₃Lu₄O₉:Er³⁺/Yb³⁺ phosphors

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Energy transfer in lanthanide upconversion studies for extended optical applications

Cited by 880 publications

References 225 publications

Phase angle encoded upconversion luminescent nanocrystals for multiplexing applications

Phase angle encoded upconversion luminescent nanocrystals for multiplexing applications

A Rationally Designed Upconversion Nanoprobe for in Vivo Detection of Hydroxyl Radical

Upconversion luminescence enhancement and temperature sensing behavior of F− co-doped Ba3Lu4O9:Er3+/Yb3+ phosphors

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Upconversion luminescence enhancement and temperature sensing behavior of F⁻ co-doped Ba₃Lu₄O₉:Er³⁺/Yb³⁺ phosphors