We report the effect of magnetic fields (MFs) on emission Eu-doped NaYF4 nanoparticles. A notable shift in the position of emission bands and the suppressed emission intensity are observed with the MF. These magnetic-optical interactions are explained in terms of the Zeeman effect, enhanced cross-relaxation rate and change of site symmetry.
BaCuSi 4 O 10 (Han blue), CaCuSi 4 O 10 (Egyptian blue), and SrCuSi 4 O 10 are pigments found in many ancient artifacts all over the world. Behind their brilliant color, we demonstrate here that these ancient pigments are strong candidates for photonic materials due to their bright Stokes and anti-Stokes emissions. These pigments give near-infrared emissions (NIR) from Cu 2+ centered at around 930 nm under excitation of 440-800 nm light. This NIR emission can also be produced by pumping using a NIR laser diode. With the rise of pumping density, the emission bandwidth increases notably and stretches to the visible region, giving rise to bright, and broadband photon upconversion (UC). This photon UC process is interpreted in terms of laser-driven blackbody radiation from the ancient pigments.
Core–shell NaYF4:Yb3+, Tm3+@NaYF4:Yb3+, Nd3+ nanosystem for temperature sensing with a minimized heating effect, which demonstrates a high sensitivity of up to 1.55% K−1 at a temperature range between 313 and 553 K.
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