Abstract
A combination of techniques is used to investigate the incorporation of chromium in the persistent phosphor LiGa5O8:Cr3+. Afterglow can be enhanced by codoping with Si(iv) or Ge(iv) ions.
Highlights
Persistent phosphors are luminescent materials that keep emitting light long after the optical excitation has stopped
In 2007, Le Masne de Chermont and coworkers showed in their proof-of-principle experiments that near-infrared emitting long persistent phosphors (NIR LPP) can be used in bio-imaging applications as an alternative to radioactive probes.[5]
We investigate the structural properties of the persistent phosphor LiGa5O8:Cr3+ (LGO:Cr) that was reported to exhibit very efficient NIR persistent luminescence.[22]
Summary
Persistent phosphors are luminescent materials that keep emitting light long after the optical excitation has stopped. Since the discovery of the efficient green emitting phosphor SrAl2O4:Eu,Dy by Matsusawa et al in 1996, these materials have found uses in a wide range of applications such as toys, displays and safety signage.[1,2,3,4] In 2007, Le Masne de Chermont and coworkers showed in their proof-of-principle experiments that near-infrared emitting long persistent phosphors (NIR LPP) can be used in bio-imaging applications as an alternative to radioactive probes.[5] This application requires an emission spectrum in a wavelength region where absorption and scattering of light by blood and tissue components is minimal. Two wavelength ranges were identified: one between 650 and 950 nm, and one between 1000 and 1350 nm. These are known as the first and second tissue transparency window, respectively.[6]
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