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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...
Europium(III) Nanoparticles are fabricated for sensing and imaging of physiological temperatures (see image). The material shows visible‐light excitation, line‐like emission, inertness to external perturbers (such as oxygen in air), and a dynamic range that covers temperatures encountered in medicine and (cellular) biology. The resolution is ±0.3 °C. The nanoparticles may also be incorporated into...
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