Upconversion white-light emission luminescence characteristics based on single-particle NaYF<sub>4 </sub>microrod

White upconversion (UC) luminescent materials have shown incomparable advantages over other light sources in the fields of solid-state lighting, liquid crystal display, and bioimaging, received extensive attention from researchers. In this work, a series microcrystals doped with different ion concentrations is synthesized by hydrothermal method, such as NaYF<sub>4</sub>: Yb<sup>3+</sup>/Ho<sup>3+</sup>/Tm<sup>3+</sup> Yb<sup>3+</sup>/Ho<sup>3+</sup>/Tm<sup>3+</sup>, their corresponding micron core-shell (CS) structures are constructed based on epitaxial growth technology. The structure morphology prepared characterised X-ray diffractometer (XRD) scanning electron microscope (SEM), showing that microcrystal has pure hexagonal-phase rod-like shape. Under excitation 980 nm near-infrared laser, white UC luminescence characteristics Ho<sup>3+</sup>/Tm<sup>3+</sup> Er<sup>3+</sup>/Tm<sup>3+</sup> co-doped single-particle NaYF<sub>4</sub> systematically studied modulating concentration doping ions. study shows microcrystals, can be easily achieved Yb<sup>3+</sup> ions, while microcrystal, effectively Er<sup>3+</sup> According to microncrystals systems, physical mechanism emission regulation revealed, which mainly due interaction between including cross relaxation (CR) process energy back transfer (EBT) process. Meanwhile, an effective enhancement CS microrod coating inert shell. Therefore, technique construction not only realize microrods, but also provide important experimental reference for further enhancing expand applications optoelectronics anti-counterfeiting.