Correlation between Size-Dependent Luminescent Properties and Local Structure around Eu³⁺ Ions in YBO₃:Eu Nanocrystals:  An XAFS Study

Abstract

X-ray absorption fine structure spectroscopy (XAFS), a powerful tool for the study of the local environment of a particular element, especially the luminescent center, was introduced to investigate the correlation between luminescent properties and local structure around Eu3+ ions in YBO3:Eu nanocrystals, which was prepared by a more facile sol−gel pyrolysis process in our previous work and which exhibited size-dependent chromaticity, that is, a relatively better chromaticity could be obtained in the smaller-sized samples. The YBO3:Eu phosphors were studied at the Eu LIII edge (6977 eV), and XAFS results showed that the higher levels of disorder in the nanocrystals were responsible for the relatively better chromaticity. By analyzing recent studies on the nanosized materials, we considered that the high levels of disorder in the YBO3:Eu nanocrystals resulted from the low levels of crystallization.

Solid state white light emitting systems based on CeF3: RE3+ nanoparticles and their composites with polymers

“…Most research work basically focuses on rare-earth oxide [1,2], phosphates [3][4][5][6], and borates. Inorganic fluorides nanocrystals doped with rare-earth ions have shown unique luminescence properties and hence are good candidates as host materials with correspondingly useful applications in optical telecommunication, lasers, new optoelectronic devices as well as in diagnostics and biological labels [3][4][5][6][7][8][9][10]. The fluoride lattice provides for the high coordination number for the doped rare-earth ions and the high ionicity of the rare-earth to fluorine bond results in a very wide band gap, low vibrational energies and low probability of inter-configurational transitions.…”

Controlled synthesis of Eu3+-doped La2O2S nanophosphors by refluxing method

“…C s , C n , C nV ) sites, the parity forbiddance will be partially permitted and thus a 5 D 0 ! 7 F 0 emission can be observed [29]. In Eu 3þ -doped La 2 O 2 S nanocrystals PL spectrum, we observed 5 D 0 !…”

Effect of flux compounds on the luminescence properties of Eu3+doped YBO3phosphors

“…Among them, RE (rare earth) doped orthoborate materials with a hexagonal crystal structure have attracted worldwide attention since they possess acceptable chemical stability and their ultraviolet (UV) transparency and vacuum ultraviolet (VUV) optical damage threshold are significant [1][2][3][4]. So, they have been used as lamp and plasma display panels (PDP) for a long time.…”