Gd3+-Doping Effect on Upconversion Emission of NaYF4: Yb3+, Er3+/Tm3+ Microparticles

Abstract

β-NaYF4 microcrystals co-doped with Yb3+, Er3+/Tm3+, and Gd3+ ions were synthesized via a hydrothermal method using rare-earth chlorides as the precursors. The SEM and XRD data show that the doped β-NaYF4 form uniform hexagonal prisms with an approximate size of 600–800 nm. The partial substitution of Y by Gd results in size reduction of microcrystals. Upconversion luminescence spectra of microcrystals upon 980 nm excitation contain characteristic intra-configurational ff bands of Er3+/Tm3+ ions. An addition of Gd3+ ions leads to a significant enhancement of upconversion luminescence intensity with maxima at 5 mol % of dopant.

Multifunctional CaF2: Yb3+, Ho3+, Gd3+ Nanocrystals: Insight into Crystal Growth and Properties of Upconversion Luminescence, Magnetic, and Temperature Sensing Properties

“…19 Vidyakina and colleagues explained that the enhancement of UC luminescence by Gd 3+ -doped NaYF 4 : Yb 3+ , Tm 3+ , Er 3+ was connected with the emergence of lattice defects that altered the environmental symmetry of Yb 3+ , Tm 3+ , and Er 3+ ions. 20 In this work, Gd 3+ -doped CaF 2 : 20% Yb 3+ , 1% Ho 3+ nanoparticles not only greatly improved the upconversion luminescence intensity but also possessed special magnetic properties on account of the large magnetic moment of Gd 3+ . This furnishes a relatively easy way of composing the multiple functions into a single-phase material.…”

Cinnamal Sensing and Luminescence Color Tuning in a Series of Rare-Earth Metal−Organic Frameworks with Trans-1,4-cyclohexanedicarboxylate

“…Instead, the photoexcitation is released through a phen-centered π*→π transition, which is usually not very effective, as a great deal of the energy is released through a nonemitting relaxation along multiple vibrational states of the antenna ligand. Keeping in mind that the compounds 1-3 are completely isostructural, the coordination matrix 1 with low luminescence activity can be employed for the dilution of photoactive Eu 3+ and/or Tb 3+ cations in the homogeneous crystalline phase [52][53][54][55][56][57]. Such lanthanide doping of the yttrium framework could (i) improve the luminescence efficiency by reducing the concentration quenching known for such luminophores (Eu 3+ , Tb 3+ ) and (ii) allow the mixing of the luminescence colors for more complex optical properties.…”

Effect of Gd3+, La3+, Lu3+ Co-Doping on the Morphology and Luminescent Properties of NaYF4:Sm3+ Phosphors

“…The optical properties of these materials depend on the particles’ size and morphology, crystal symmetry, type, and concentration of rare earth ions in the host matrix [ 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. Sodium yttrium fluoride is one of the best host matrices for luminescent rare earth-doped inorganic materials because this matrix has only low-frequency vibrational modes, and therefore does not quench the luminescence.…”