Shape controllable synthesis and enhanced upconversion photoluminescence of ${{\beta }}$-NaGdF ₄ :Yb ³⁺ , Er ³⁺ nanocrystals by introducing Mg ²⁺

Abstract

Different concentrations of Mg 2+ -doped hexagonal phase NaGdF 4 :Yb 3+ , Er 3+ nanocrystals (NCs) were synthesized by a modified solvothermal method. Successful codoping of Mg 2+ ions in upconversion nanoparticles (UCNPs) was supported by XRD, SEM, EDS, and PL analyses. The effects of Mg 2+ doping on the morphology and the intensity of the upconversion (UC) emission were discussed in detail. It turned out that with the concentration of Mg 2+ increasing, the morphology of the nanoparticles turn to change gradually and the UC emission was increasing gradually as well. Notably the UC fluorescence intensities of Er 3+ were gradually improved owing to the codoped Mg 2+ and then achieved a maximum level as the concentration of Mg 2+ ions was 60 mol% from the amendment of the crystal structure of β -NaGdF 4 :Yb 3+ , Er 3+ nanoparticles. Moreover, the UC luminescence properties of the rare-earth (Yb 3+ , Er 3+ ) ions codoped NaGdF 4 nanocrystals were investigated in detail under 980-nm excitation.

Revealing the role of a unique local structure in lanthanide-doped Cs2LiInCl6 in boosting visible and NIR-II luminescence

“…S8†). 36–40 Thus, the higher tolerance of Er 3+ content in Cs 2 LiInCl 6 is definitely beneficial to the UC emission, consistent with the results in Fig. 3a.…”

Up/down-conversion luminescence of monoclinic Gd2O3:Er3+ nanoparticles prepared by laser ablation in liquid

“…Rare earth luminescent materials have attracted much attention in recent years due to the unique electronic structure and physical properties of rare earth ions. [1][2][3][4] At present, rare earth luminescent materials have been widely used in lighting, display and other fields. [5][6][7][8][9][10] Rare earth-doped gadolinium oxide is a kind of good luminescent material.…”

Selective enhancement of green upconversion luminescence of Er–Yb: NaYF 4 by surface plasmon resonance of W 18 O 49 nanoflowers and applications in temperature sensing

“…In the past few decades, a great deal effort has been devoted to the upconversion (UC) luminescence of rare-earth ions doped materials because of their wide applications. [1][2][3][4][5][6][7] The NaYF 4 has been regarded as the most efficient UC matrix due to its low phonon energy and crystalline surrounding. [8][9][10] Although recent advances in synthesis have led to the accurate control of morphology, crystal phase, and emission colors, it is still difficult to obtain highly efficient upconversion nanoparticles.…”