Electronic structure of nanocrystals YF3­­: RE

Aleksandra Skuta 1Ewa Talik 2Ludwika Lipińska 3Monika Michalska 4

1. University of Silesia, Institute of Physics, Uniwersytecka 4, Katowice 40-007, Poland
2. Institute of Physics, Silesian University, Uniwersytecka 4, Katowice 40007, Poland
3. Institute of Electronic Materials Technology (ITME), Warszawa 01919, Poland
4. Institute of Electronic Materials Technology (ITME), Wólczyńska, Warsaw 01-919, Poland

Abstract

Up-conversion phosphors emit visible light after excitation by lower energy photons, usually in the near infrared spectral range. They have potential applications in different fields of science and technology, including luminescent displays, optoelectronic devices or lasers and amplifiers. Recently, a great interest has been devoted to their use in infrared (IR) and visible imaging for biological research and medical diagnosis, because of their important advantages when compared to the traditional biolabels such as organic dyes, semiconductors or metallic nanoparticles. For example, the up-conversion mechanisms are favourable compared to traditional down-conversion ones due to the higher penetration depth of light achieved in tissues under IR excitation wavelengths. Moreover, this excitation scheme also accounts for the lower photo-damage to living organisms, and the possibility of obtaining a higher spatial resolution and weak autofluorescence from cells or tissues. Additionally, it is possible to obtain nanophosphors with low toxicity, which is also one of the main points of interest in comparison with other bio-labels. Rare-earth (RE) based up-conversion nanophosphors are based on the combination of ion pairs acting as sensitizers–activators that allow a variety of excitation–emission choices.[1]

In the present work we have synthesized  nanopowders using thermal decomposition method as follows. Firstly, the Y2O3 was dissolved in acetic acid, RE2O3 in diluted  nitric acid and NH4F in deionized water. Next  all solutions were mixed together and stirred for 6 h at 70 ºC. During slow evaporation of the mixture the volume was decreased 5 times. Then the concentrated solution was dried in 150C in order to total remove of water. Next the dry powder was calcined in air atmosphere in 400oC during 2 h. Electronic structure and atomic concentration of samples were characterized by the following method X-ray photoelectron spectroscopy (XPS).

References:

1. Marta Quintanilla, Nuria O. Nunez, Eugenio Cantelar, Manuel Ocana and Fernando Cusso, Tuning from blue to magenta the up-converted emissions of YF3:Tm3+/Yb3+nanocrystals

 

Related papers
  1. Kinetic studies of 4-chlorophenol adsorption on the reduced graphene oxides  
  2. The influence of CeO2 on electrochemical performance of LiMn2O4.
  3. Novel synthesis of olivine lithium metal phosphates LiMPO4 (M = Fe, Mn, Ni, Co) - analysis and studies.
  4. LiMn2O4/graphene oxide as a cathode material for lithium ion battery
  5. Li4Ti5O12/CNT as an anode material for LiBs - structural, morphological and electrochemical studies
  6. From the mine to the tops: Graphene oxide – the mysterious derivative of flake graphene. Properties and applications
  7. Synthesis of nano-Li4Ti5O12 decorated by silver nanoparticles as an anode material for lithium ion batteries
  8. Structural and electrochemical studies on LiMn2O4 cathode material for LIBs coated with ceramic oxides
  9. Safe nanomaterials of spinel structure for lithium-ion secondary batteries 
  10. Electronic structure of nanocrystals YF3­­: RE
  11. NANONET Foundation
  12. Synthesis and studies on LiMn2O4/Carbon nanocomposites as a cathode materials for lithium ion batteries
  13. NANONET Foundation
  14. Materials for lithium ion batteries
  15. Fundacja Wspierania Nanonauk i Nanotechnologii NANONET
  16. Prezentacja Fundacji NANONET
  17. Synthesis by sol-gel method of nanocrystalline compounds within Y2O3(Nd2O3)–Al2O3 system for optical applications
  18. Growth and characterization of Nd, Yb – Yttrium oxide nanopowders obtained by sol-gel method
  19. On the solubility of Nd3+ in Y3Al5O12
  20. "Electron Spin Resonance in GdPdX compounds; X - p element"

Presentation: Poster at 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17, General Session 8, by Aleksandra Skuta
See On-line Journal of 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17

Submitted: 2013-03-27 12:48
Revised:   2013-07-19 23:45