Correlation between luminescent properties and local coordination environment for erbium dopant in yttrium oxide nanotubes

Abstract

The local dopant coordination environment and its effect on the photoluminescent ͑PL͒ spectral features of erbium-doped yttrium oxide nanotubes ͑NTs͒ were probed by synchrotron-based x-ray diffraction ͑XRD͒, x-ray absorption near-edge spectroscopy ͑XANES͒, and extended x-ray absorption fine structure ͑EXAFS͒. XRD, XANES, and EXAFS data demonstrate that single phase solid solutions of Y ͑2−x͒ Er x O 3 were formed at 0 Յ x Ͻ 0.4 and 1.2Ͻ x Յ 2, and the valence state of Er ions in the Y 2 O 3 NTs is +3. The x-ray spectroscopic data clearly show that the erbium dopants largely reside in two types of sites in the Y 2 O 3 host material, both of which possess a well-defined intermediate-range structure, and that the doping of erbium into Y 2 O 3 does not cause a loss in intermediate-range order and crystallinity in the Er 3+ :Y 2 O 3 NTs. This well-defined distribution of erbium doping inside the Y 2 O 3 matrix correlates well with the observed sharp and well-resolved PL behavior of these Er 3+ :Y 2 O 3 NTs at around 1.535 m.

Erbium(III) Coordination at the Surface of an Aqueous Electrolyte

“…This distance is 8.5% shorter than the average Er−Er distance reported for the solid-state structure of Er 2 O 3 with 6 Er at 3.496 Å. 74 The contraction for the liquid electrolyte is correlated with the decrease in the number of Er nearest neighbors with respect to that for the solid oxide. The three shell fit to the I e(⊥) EXAFS for the liquid electrolyte is shown as dashed lines in Figure 5, and the metrical results are provided in Table 2 of the Supporting Information.…”

“…Precedent is provided by the observations made here and elsewhere 68 Figure 7 of the Supporting Information). 74,75 Although ligand-field effects are certainly at play for the liquid electrolyte system studied here, they are smaller than the spectral resolution of the beamline optics, suggesting an O CN greater than six and, therefore, cannot be resolved in the second differential of the XANES data. EXAFS.…”

Luminescent properties of ensemble and individual erbium-doped yttrium oxide nanotubes

“…In addition, powder and synchrotron XRD analyses confirmed that these 5% Er 3+ :Y 2 O 3 NTs are of a cubic bixbyite Y 2 O 3 structure ͑space group: Ia3͒, 41 without observable impurities ͑data not shown here͒. 32,33…”

“…[16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] For example, we have recently reported detailed studies on syntheses and morphological and crystal structural characterization of one dimensional ͑1D͒ erbium-doped yttrium hydroxide ͓Er 3+ :Y͑OH͒ 3 ͔ NTs and erbiumdoped yttrium oxide ͑Er 3+ :Y 2 O 3 ͒ NTs and the effect of local Er 3+ dopant coordination environments on the photoluminescent spectral features of Er 3+ :Y 2 O 3 NTs. 32,33 Overall, the optical properties of individual nanosized luminescent emitters have received much attention, mainly on elemental, II-VI, and III-V semiconductors. [34][35][36][37][38] These low-dimensional systems show interesting fundamental properties and have exciting prospects in nanotechnologyenabled optical and electronic applications.…”

Preparation and Optical Properties of YH2:Er2+ and Y2O3:Er3+ Nanoparticles

“…It is also smaller than that of the Y 2 O 3 :Er 3+ thin film prepared by radical-enhanced atomic layer deposition. 19 28-30 It should be pointed out that if the Er 3+ is distributed irregularly in different crystallographic sites, it will randomize the Stark splitting, 31 resulting in a homogeneous spectral broadening. It is found that the fluorescence spectrum of the sample sintered at 700 C around 1535 nm is extremely sharp and well-resolved.…”