Up and down the spectrum: upconversion nanocrystal and semiconductor material fused into a single nanocomposite

Abstract

A nanocomposite consisting of a cubic EuSe semiconductor material grown on a hexagonal upconversion nanoparticle has overcome the crystal lattice mismatch that typically prevents the epitaxial growth of such heterogeneous nanocrystals. Eu3+ at the interface layer shows its characteristic red emission band both under UV excitation light due to energy transfer from the semiconductor and under NIR excitation light due to energy transfer after photon-upconversion. Data storage and security applications are suggested for this new nanocomposite.

Effect of Pr3+ concentration in luminescence properties & upconversion mechanism of triple doped NaYF4: Yb3+, Er3+, Pr3+

“…Studies also reported lanthanides due to their comparable ionic radii can be substituted for one another in crystalline host matrices; they can also be added in various combinations and introduced in varying concentrations without significantly altering the crystal structure [26]. Since the ionic diameters of Pr 3+ (1.82 Å) and Y 3+ (1.80 Å) are similar, and the valence of Pr 3+ and Y 3+ are the same, Pr 3+ can substitute for the Y 3+ sites [27].…”