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

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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.

Original languageEnglish
Pages (from-to)972-979
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume245
DOIs
Publication statusPublished - 2017

Fingerprint

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

Keywords

  • Inner-filter effect
  • Inorganic phosphor
  • Luminescence
  • Optical sensor
  • pH
  • Upconversion

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

Cite this

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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.}",
year = "2017",
doi = "10.1016/j.snb.2017.01.189",
language = "English",
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journal = "Sensors and Actuators / B, Chemical",
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TY - JOUR

T1 - Photostable upconverting and downconverting pH sensors based on combination of a colorimetric NIR indicator and stable inorganic phosphors as secondary emitters

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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U2 - 10.1016/j.snb.2017.01.189

DO - 10.1016/j.snb.2017.01.189

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JO - Sensors and Actuators / B, Chemical

JF - Sensors and Actuators / B, Chemical

SN - 0925-4005

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