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Ratiometric encoding with two types of photon‐upconverting nanoparticles is demonstrated. Different concentrations of filter dyes on the nanoparticle’s surface are used to tune selectively one of the dual emission bands (Icode). The second emission band (Iref), by contrast, serves as an internal reference to obtain ratiometric codes. Combining UCNPs with distinct emission bands expands the coding...
A new luminescent europium probe is presented for the determination of phosphate (P) in microtiter plate format. The assay is based on the quenching of the luminescence of the europium–tetracycline (EuTc) 1:1 complex by phosphate using a reagent concentration of 20.8μmol/L. The probe is excited at 400nm and displays a large Stokes’ shift of 210nm. The emission maximum is located at 616nm. The system...
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