Luminescence, energy transfer, colour modulation and up-conversion mechanisms of Yb, Tm and Ho co-doped YMoO.

A series of novel up-conversion luminescent Yb/Ln (Tm, Ho, Tm/Ho)-doped YMoO (YMO) nanocrystals were synthesized using the sol-gel method. The consistent spherical morphology of the nanocrystals with different doping ratios was found to be profiting from the homogenisation and rapid agglomeration of the composition in the gel state and calcining process. The X-ray diffraction (XRD) and field-emission scanning electron microscope images were employed to confirm perfect crystallinity and uniform morphology.

Inner filter effect between upconversion nanoparticles and Fe(ii)-1,10-phenanthroline complex for the detection of Sn(ii) and ascorbic acid (AA).

Dual-function and multi-function sensors can use the same material or detection system to achieve the purpose of detection of two or more substances. Due to their high sensitivity and specificity, dual-function and multi-function sensors have potential applications in many fields. In this article, we designed a dual-function sensor to detect Sn(ii) and ascorbic acid (AA) based on the inner filter effect (IFE) between NaYF:Yb,Er@NaYF@PAA (UCNPs@PAA) and Fe(ii)-1,10-phenanthroline complex.