Local structure and luminescence of nanocrystalline Y2O3:Eu

Abstract

Nanosized Y2O3:Eu was synthesized by using a solution–combustion method. The samples were characterized by x-ray diffraction, extended x-ray absorption fine structure (EXAFS), and photoluminescence spectroscopy. Our EXAFS result showed that the local environments surrounding both Y and Eu atoms had obviously changed when the particle size was smaller than 10 nm. The coordination number and the bond length of Y (Eu)–O shell increased and the disorder became larger. This change also produced an emission peak and the charge-transfer band showed an unusual redshift as the particle size decreased. The luminescence properties can be explained by use of the EXAFS results.

The importance of inversion disorder in the visible light induced persistent luminescence in Cr3+doped AB2O4(A = Zn or Mg and B = Ga or Al)

“…This makes it a versatile tool to study persistent luminescent materials since the dopant concentration will usually be very low. [18][19][20][21][22][23][24][25][26][27][28] …”

Preparation and luminescent properties of Gd 2 O 3 :Eu 3+ nanofibres made by electrospinning

“…This differed from the normal case in which the CT band shifts when the sample dimensions change. [26,27] No excitonic band below 220 nm was observed. In the emission spectra, the peaks at 587 nm, 615 nm, and 629 nm, respectively, belong to 5 D 0 -7 F j (j¼ 1, 2) transitions of Eu 3 þ ions.…”

Upconversion emission from amorphous Y2O3:Tm3+, Yb3+ prepared by nanosecond pulsed laser irradiation

“…Qin et al reported enhancement of ultraviolet UC in Yb 3+ and Tm 3+ codoped fluoride film due to the decrease of Judd-Ofelt parameter X 2 , which is related to the symmetry of the ligand field [8]. Qi et al indicated that the change of local structure around the active ions lead to new emission peaks and the red shift of the charge-transfer band of the Eu 3+ ions [9]. Patra et al investigated the effect of crystal size and crystal phase on UC luminescence in ZrO 2 : Er 3+ nanocrystals [10].…”