Upconversion Phosphors

Suijver, J. Freek

doi:10.1002/9783527621064.ch6

Cited by 9 publications

(7 citation statements)

References 28 publications

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“…concentrations from 5 to 10 mol% and then decreased beyond 10 mol% due to the concentration quenching effect. Such a result is also observed in other host matrices [21]. So based on our results, we concluded that the optimum Er 3?…”

Section: Resultssupporting

confidence: 80%

Optical thermometry based on the upconversion luminescence from Er doped Bi7Ti4TaO21 ferroelectric ceramics

Zou

Wang

et al. 2015

J Mater Sci: Mater Electron

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The Er doped Bi 7 Ti 4 TaO 21 ceramics were prepared using conventional solid-state reaction techniques. Under 980 nm excitation, the intensive green emission was investigated and the up-conversion emission was a two-photo energy transfer process. By using fluorescence intensity ratio technique, the collected data was well fitted to the function of temperature in the temperature range of 175-600 K, revealing the good potential for the development of optical thermometry.

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Section: Resultssupporting

confidence: 80%

Optical thermometry based on the upconversion luminescence from Er doped Bi7Ti4TaO21 ferroelectric ceramics

Zou

Wang

et al. 2015

J Mater Sci: Mater Electron

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“…Colloidal nanoparticles doped with combinations of lanthanide ions , such as Yb 3+ and Er 3+ have emerged as promising optical probes for biological imaging , and single-molecule tracking. − These materials, when excited with near-infrared (NIR) radiation, emit exceptionally stable , and visible luminescence, , a process termed upconversion, making the nanoparticles ideal for extended imaging of cells and internal organs . However, the abundance of 4f N electronic states in lanthanide ions typically leads to multiple overlapping emission lines, thereby precluding the simultaneous tracking and quantitation of large numbers of colocalized species.…”

Section: Binary Dopingmentioning

confidence: 99%

Combinatorial Discovery of Lanthanide-Doped Nanocrystals with Spectrally Pure Upconverted Emission

et al. 2012

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Nanoparticles doped with lanthanide ions exhibit stable and visible luminescence under near-infrared excitation via a process known as upconversion, enabling long-duration, low-background biological imaging. However, the complex, overlapping emission spectra of lanthanide ions can hinder the quantitative imaging of samples labeled with multiple upconverting probes. Here, we use combinatorial screening of multiply doped NaYF(4) nanocrystals to identify a series of doubly and triply doped upconverting nanoparticles that exhibit narrow, spectrally pure emission spectra at various visible wavelengths. We then developed a comprehensive kinetic model validated by our extensive experimental data set. Applying this model, we elucidated the energy transfer mechanisms giving rise to spectrally pure emission. These mechanisms suggest design rules for electronic level structures that yield robust color tuning in lanthanide-doped upconverting nanoparticles. The resulting materials will be useful for background-free multicolor imaging and tracking of biological processes.

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“…5 which were typically excited state absorption (ESA) processes. 2 Under a 980 nm laser excitation, the 4 I 15=2 and 4 I 11=2 are populated by ESA process. Then after the nonradiative relaxation, the emission at 533, 550 and 670 nm was produced by the 2 H 11=2 !…”

Section: Resultsmentioning

confidence: 99%

“…Over the past several decades, the visible up-conversion (UC) luminescence of rare earth (RE) ions have received considerable attention in the fields of physics, chemistry, material science and life science because of broad potential application including UC laser and optical amplifier, solar cells, high-density memories, three-dimensional displays, biotechniques and other photonic devices. [1][2][3] Many RE ions, such as Er 3þ , Ho 3þ and Tm 3þ , have been studied to observe their UC luminescence, corresponding mechanism and applications. 4,5 Among these RE ions, the Er 3þ doping systems remain the key constituents for a majority of UC materials due to the abundant energy level for UC luminescence and high luminescent quenching concentration of Er 3þ ions.…”

Section: Introductionmentioning

confidence: 99%

Intensive up-conversion photoluminescence of Er³⁺-doped Bi₇Ti₄NbO₂₁ ferroelectric ceramics and its temperature sensing

Zou

Cao

et al. 2014

J. Adv. Dielect.

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The intensive up-conversion (UC) photoluminescence and temperature sensing behavior of Er 3+-doped Bi 7 Ti 4 NbO 21( BTN ) ferroelectric ceramics prepared by a conventional solid-state reaction technique have been investigated. The X-ray diffraction and field emission scanning electron microscope analyses demonstrated that the Er 3+-doped BTN ceramics are single phase and uniform flake-like structure. With the Er 3+ ions doping, the intensive UC emission was observed without obviously changing the properties of ferroelectric. The optimal emission intensity was obtained when Er doping level was 15 mol.%. The temperature sensing behavior was studied by fluorescence intensity ratio (FIR) technique of two green UC emission bands, and the experimental data fitted very well with the function of temperature in a range of 133–573 K. It suggested that the Er 3+-doped BTN ferroelectric ceramics are very good candidates for applications such as optical thermometry, electro-optical devices and bio-imaging ceramics.

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Upconversion Phosphors

Cited by 9 publications

References 28 publications

Optical thermometry based on the upconversion luminescence from Er doped Bi7Ti4TaO21 ferroelectric ceramics

Optical thermometry based on the upconversion luminescence from Er doped Bi7Ti4TaO21 ferroelectric ceramics

Combinatorial Discovery of Lanthanide-Doped Nanocrystals with Spectrally Pure Upconverted Emission

Intensive up-conversion photoluminescence of Er³⁺-doped Bi₇Ti₄NbO₂₁ ferroelectric ceramics and its temperature sensing

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Upconversion Phosphors

Cited by 9 publications

References 28 publications

Optical thermometry based on the upconversion luminescence from Er doped Bi7Ti4TaO21 ferroelectric ceramics

Optical thermometry based on the upconversion luminescence from Er doped Bi7Ti4TaO21 ferroelectric ceramics

Combinatorial Discovery of Lanthanide-Doped Nanocrystals with Spectrally Pure Upconverted Emission

Intensive up-conversion photoluminescence of Er3+-doped Bi7Ti4NbO21 ferroelectric ceramics and its temperature sensing

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Intensive up-conversion photoluminescence of Er³⁺-doped Bi₇Ti₄NbO₂₁ ferroelectric ceramics and its temperature sensing