Abstract
Construction of an active composite as a biomarker with deeper tissue penetration and higher signal-to-noise ratio (SNR) is of great importance for the application in bioimaging. Here, we report a strategy for tuning the emission bandwidth and intensity via crystal field control in long persistent phosphors (LPPs). Ni2+-doped Zn1+ySnyGa2−x−2yO4 phosphors, with a tunable emission band peaking from 1270 to 1430 nm in the second near-infrared (NIR) window, have been successfully prepared. Such featured materials have the advantages of low absorption and scattering as well as more efficient tissue penetration. The emission spectra can be controlled by tailoring the local crystal field around the activator precisely via substitution of Zn and Sn for Ga. Moreover, with high resolution and weak light disturbance, these developed multi-band afterglow phosphors exhibit great application potential in advanced optical imaging.
Highlights
Construction of an active composite as a biomarker with deeper tissue penetration and higher signalto-noise ratio (SNR) is of great importance for the application in bioimaging
Due to superior performance of long persistent phosphors (LPPs), they are recognized as the suitable materials to satisfy the requirement, i.e. the exclusion of external illumination which removes the possibility of autofluorescence from background noise[3,4]
Higher intense afterglow emission and lower transmission loss are essential for improving the signal-to-noise ratio (SNR) in the process of optical signal acquisition in in vivo imaging[5,6]
Summary
Construction of an active composite as a biomarker with deeper tissue penetration and higher signalto-noise ratio (SNR) is of great importance for the application in bioimaging. Ni2+-doped Zn1+ySnyGa2−x−2yO4 phosphors, with a tunable emission band peaking from 1270 to 1430 nm in the second near-infrared (NIR) window, have been successfully prepared Such featured materials have the advantages of low absorption and scattering as well as more efficient tissue penetration. The emission spectra can be controlled by tailoring the local crystal field around the activator precisely via substitution of Zn and Sn for Ga. with high resolution and weak light disturbance, these developed multi-band afterglow phosphors exhibit great application potential in advanced optical imaging. We suggest a strategy of element substitution to tune the operational waveband and emission intensity This route potentially achieves the control of crystal field surrounding the activators and increases the SNR during the process of optical signal acquisition. 0.5%Ni phosphor under excitation at 320 nm. (b) Photoluminescence excitation spectrum and afterglow excitation spectrum of ZGO: 0.5%Ni phosphor monitored at 1270 nm
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