Linear polarization-dependent core-level photoemission spectroscopy in Yb-based valence fluctuating system

Kuga, Kentaro; Kanai, Yu; Fujiwara, H.; Yamagami, Kohei; Hamamoto, Satoru; Aoyama, Yuichi; Sekiyama, A.; Higashiya, A.; Kadono, Takashi; Imada, S.; Yamasaki, Akira; Tamasaku, Kenji; Yabashi, Makina; Ishikawa, Tetsuya; Nakatsuji, Satoru

doi:10.1016/j.elspec.2019.08.004

Cited by 1 publication

(1 citation statement)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[63] The Yb 3d 5/2 spectra contain the main Yb 3+ feature at 1524-1536 eV, a plasmon satellite (energy loss) peak at 1546 eV, and a small contribution of Yb 2+ at 1520 eV for sample A. [64][65][66][67] Additional core levels are shown in the Supporting Information. The contribution of Yb 2+ in sample A to the total Yb 3d 5/2 signal is at most 4%.…”

Section: Depth-profiling Haxpesmentioning

confidence: 99%

Quantification of the Activator and Sensitizer Ion Distributions in NaYF₄:Yb³⁺, Er³⁺ Upconverting Nanoparticles Via Depth‐Profiling with Tender X‐Ray Photoemission

Clark

Andresen

Sear

et al. 2022

Small

View full text Add to dashboard Cite

The spatial distribution and concentration of lanthanide activator and sensitizer dopant ions are of key importance for the luminescence color and efficiency of upconverting nanoparticles (UCNPs). Quantifying dopant ion distributions and intermixing, and correlating them with synthesis methods require suitable analytical techniques. Here, X‐ray photoelectron spectroscopy depth‐profiling with tender X‐rays (2000–6000 eV), providing probe depths ideally matched to UCNP sizes, is used to measure the depth‐dependent concentration ratios of Er3+ to Yb3+, [Er3+]/[Yb3+], in three types of UCNPs prepared using different reagents and synthesis methods. This is combined with data simulations and inductively coupled plasma‐optical emission spectroscopy (ICP‐OES) measurements of the lanthanide ion concentrations to construct models of the UCNPs’ dopant ion distributions. The UCNP sizes and architectures are chosen to demonstrate the potential of this approach. Core‐only UCNPs synthesized with XCl3·6H2O precursors (β‐phase) exhibit a homogeneous distribution of lanthanide ions, but a slightly surface‐enhanced [Er3+]/[Yb3+] is observed for UCNPs prepared with trifluroacetate precursors (α‐phase). Examination of Yb‐core@Er‐shell UCNPs reveals a co‐doped, intermixed region between the single‐doped core and shell. The impact of these different dopant ion distributions on the UCNP's optical properties is discussed to highlight their importance for UCNP functionality and the design of efficient UCNPs.

show abstract

Section: Depth-profiling Haxpesmentioning

confidence: 99%

Quantification of the Activator and Sensitizer Ion Distributions in NaYF₄:Yb³⁺, Er³⁺ Upconverting Nanoparticles Via Depth‐Profiling with Tender X‐Ray Photoemission

Clark

Andresen

Sear

et al. 2022

Small

View full text Add to dashboard Cite

show abstract

Linear polarization-dependent core-level photoemission spectroscopy in Yb-based valence fluctuating system

Cited by 1 publication

References 27 publications

Quantification of the Activator and Sensitizer Ion Distributions in NaYF₄:Yb³⁺, Er³⁺ Upconverting Nanoparticles Via Depth‐Profiling with Tender X‐Ray Photoemission

Quantification of the Activator and Sensitizer Ion Distributions in NaYF₄:Yb³⁺, Er³⁺ Upconverting Nanoparticles Via Depth‐Profiling with Tender X‐Ray Photoemission

Contact Info

Product

Resources

About

Linear polarization-dependent core-level photoemission spectroscopy in Yb-based valence fluctuating system

Cited by 1 publication

References 27 publications

Quantification of the Activator and Sensitizer Ion Distributions in NaYF4:Yb3+, Er3+ Upconverting Nanoparticles Via Depth‐Profiling with Tender X‐Ray Photoemission

Quantification of the Activator and Sensitizer Ion Distributions in NaYF4:Yb3+, Er3+ Upconverting Nanoparticles Via Depth‐Profiling with Tender X‐Ray Photoemission

Contact Info

Product

Resources

About

Quantification of the Activator and Sensitizer Ion Distributions in NaYF₄:Yb³⁺, Er³⁺ Upconverting Nanoparticles Via Depth‐Profiling with Tender X‐Ray Photoemission

Quantification of the Activator and Sensitizer Ion Distributions in NaYF₄:Yb³⁺, Er³⁺ Upconverting Nanoparticles Via Depth‐Profiling with Tender X‐Ray Photoemission