Near-infrared rechargeable glass-based composites for green persistent luminescence

Arango, N. Garcia; Vuori, Sami; Byron, Hannah; Heggen, David Van der; Smet, Philippe; Lastusaari, Mika; Petit, Laëticia

doi:10.1016/j.jallcom.2022.167048

Cited by 4 publications

(1 citation statement)

References 52 publications

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“…5) The current approach used a UV light to excite the SrAl 2 O 4 :Eu, Dy traps prior to mechanoluminescence generation. However, there may be other approaches that could be used to recharge the sensor including the use of X-ray excited luminescence, [67][68][69] or similar beta luminescence, [37] or near infrared upconversion luminescence with an upconversion phosphor [70] or chemiluminescence. It may also be possible to use other mechanisms to convert ultrasound to light (e.g., piezoelectric transducer with an electroluminescent signal).…”

Section: Limitationsmentioning

confidence: 99%

Development of pH‐Sensitive Film for Detection of Implant Infection via Ultrasound Luminescent Chemical Imaging

Schober,

Uzair,

Reel

et al. 2024

Advanced Sensor Research

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A new hybrid ultrasound luminescent chemical imaging technique is described along with a pH sensor to image chemical concentrations at the surface of implanted medical devices. The purpose is to detect and study local biochemistry during infection. The sensor comprises a mechanoluminescent film (SrAl2O4:Eu, Dy microphosphors embedded in a biocompatible polymer film) and a pH indicator dye. A focused ultrasound beam generates green luminescence at the ultrasound focal point. By pulsing the ultrasound ON and OFF, the modulated luminescence can be distinguished from persistent luminescence, for high spatial resolution imaging. A red fluorescent dye and the pH indicator dye bromothymol blue are added to the coating to modulate the red‐light transmittance via pH dependent absorbance. Acidosis is observed as an increase in red luminescence intensity in spectroscopy and imaging. The films are sensitive to biologically relevant changes in pH (6.0–8.0) and can be imaged through optically scattering media to mimic tissue. The images have a knife edge spatial resolution of ≈3 mm through optically scattering phantoms, limited by the focused ultrasound spot size. This novel technique may permit the elucidation of implant infection at the implant surface and can be further developed for the measurement of other relevant chemical species in the future.

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