Dual-mode blue emission, paramagnetic properties of Yb~(3+)-Tm~(3+) co-doped GdOCl difunctional nanostructures

摘要

A series of GdOCl: Yb~(3+), Tm~(3+) one-dimensional nanostructures with dual-mode [down-conversion (DC) and up-conversion (UC)] luminescence were successfully fabricated by electrospinning technique incorporated with double-crucible chlorination method. The samples have single-phase tetragonal structure with space group of P4mm. The diameter and width of GdOCl: 10%Yb~(3+), 0.1%Tm~(3+) nanofib-ers and nanobelts are 212.84± 1.04 nm and 1.07±0.03 μm, respectively. Excited by 357-nm ultraviolet (UV) light and 980-nm near-infrared (NIR) light, Yb~(3+) and Tm~(3+) ions co-doped GdOCl nanostructures exhibit bright blue emission. The mechanism of UC emission is determined to be three-photon process. The energy transfer processes from Yb~(3+) to Tm~(3+) are discussed in detail. Moreover, the as-obtained products possess paramagnetic properties at ambient temperature. The type of difunctional one-dimensional nano-materials has promising applications in anti-counterfeiting, drug delivery, solid state lasers, biolabels and light emitting diodes (LEDs).