Photostable upconverting and downconverting pH sensors based on combination of a colorimetric NIR indicator and stable inorganic phosphors as secondary emitters

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

New robust optical pH sensors rely on a combination of a photochemically stable NIR colorimetric aza-BODIPY dye and inorganic phosphors. Inner-filter effect is utilized to convert the colorimetric changes into a luminescence response. Chromium(III)-activated gadolinium aluminium borate and Egyptian Blue were used as inert reference phosphors, enabling two-wavelength ratiometric read-out in the emission and excitation mode, respectively. Additionally, we synthetized dually-emitting upconverting particles (UCPs) based on lanthanide-doped molybdates (NaCaY1−xLax(MoO4)3, La = Yb(III), Ho(III) and Tm(III)) featuring anti-Stokes emission peaks in the red/NIR spectral region (645/800 nm). Upon NIR excitation (980 nm) the NIR emission of the upconverting particles is modulated by the pH indicator, whereas the red emission serves as a reference. Importantly, the spectral properties of the pH sensor based on UCPs are fully compatible with the biological optical window.

Originalspracheenglisch
Seiten (von - bis)972-979
Seitenumfang8
FachzeitschriftSensors and Actuators, B: Chemical
Jahrgang245
DOIs
PublikationsstatusVeröffentlicht - 2017

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pH sensors
Phosphors
phosphors
emitters
Lanthanoid Series Elements
Borates
Gadolinium
sensors
Optical sensors
Chromium
Rare earth elements
Aluminum
Luminescence
Coloring Agents
Dyes
Wavelength
molybdates
gadolinium
borates
excitation

Schlagwörter

    ASJC Scopus subject areas

    • !!Electronic, Optical and Magnetic Materials
    • !!Instrumentation
    • !!Condensed Matter Physics
    • !!Surfaces, Coatings and Films
    • !!Metals and Alloys
    • !!Materials Chemistry
    • !!Electrical and Electronic Engineering

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    title = "Photostable upconverting and downconverting pH sensors based on combination of a colorimetric NIR indicator and stable inorganic phosphors as secondary emitters",
    abstract = "New robust optical pH sensors rely on a combination of a photochemically stable NIR colorimetric aza-BODIPY dye and inorganic phosphors. Inner-filter effect is utilized to convert the colorimetric changes into a luminescence response. Chromium(III)-activated gadolinium aluminium borate and Egyptian Blue were used as inert reference phosphors, enabling two-wavelength ratiometric read-out in the emission and excitation mode, respectively. Additionally, we synthetized dually-emitting upconverting particles (UCPs) based on lanthanide-doped molybdates (NaCaY1−xLax(MoO4)3, La = Yb(III), Ho(III) and Tm(III)) featuring anti-Stokes emission peaks in the red/NIR spectral region (645/800 nm). Upon NIR excitation (980 nm) the NIR emission of the upconverting particles is modulated by the pH indicator, whereas the red emission serves as a reference. Importantly, the spectral properties of the pH sensor based on UCPs are fully compatible with the biological optical window.",
    keywords = "Inner-filter effect, Inorganic phosphor, Luminescence, Optical sensor, pH, Upconversion",
    author = "Martin Strobl and Torsten Mayr and Ingo Klimant and Borisov, {Sergey M.}",
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    AU - Strobl, Martin

    AU - Mayr, Torsten

    AU - Klimant, Ingo

    AU - Borisov, Sergey M.

    PY - 2017

    Y1 - 2017

    N2 - New robust optical pH sensors rely on a combination of a photochemically stable NIR colorimetric aza-BODIPY dye and inorganic phosphors. Inner-filter effect is utilized to convert the colorimetric changes into a luminescence response. Chromium(III)-activated gadolinium aluminium borate and Egyptian Blue were used as inert reference phosphors, enabling two-wavelength ratiometric read-out in the emission and excitation mode, respectively. Additionally, we synthetized dually-emitting upconverting particles (UCPs) based on lanthanide-doped molybdates (NaCaY1−xLax(MoO4)3, La = Yb(III), Ho(III) and Tm(III)) featuring anti-Stokes emission peaks in the red/NIR spectral region (645/800 nm). Upon NIR excitation (980 nm) the NIR emission of the upconverting particles is modulated by the pH indicator, whereas the red emission serves as a reference. Importantly, the spectral properties of the pH sensor based on UCPs are fully compatible with the biological optical window.

    AB - New robust optical pH sensors rely on a combination of a photochemically stable NIR colorimetric aza-BODIPY dye and inorganic phosphors. Inner-filter effect is utilized to convert the colorimetric changes into a luminescence response. Chromium(III)-activated gadolinium aluminium borate and Egyptian Blue were used as inert reference phosphors, enabling two-wavelength ratiometric read-out in the emission and excitation mode, respectively. Additionally, we synthetized dually-emitting upconverting particles (UCPs) based on lanthanide-doped molybdates (NaCaY1−xLax(MoO4)3, La = Yb(III), Ho(III) and Tm(III)) featuring anti-Stokes emission peaks in the red/NIR spectral region (645/800 nm). Upon NIR excitation (980 nm) the NIR emission of the upconverting particles is modulated by the pH indicator, whereas the red emission serves as a reference. Importantly, the spectral properties of the pH sensor based on UCPs are fully compatible with the biological optical window.

    KW - Inner-filter effect

    KW - Inorganic phosphor

    KW - Luminescence

    KW - Optical sensor

    KW - pH

    KW - Upconversion

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