TITLE:
Synthesis of ZnS:Tm3+ Nanoparticles by the Polyol Method
AUTHORS:
Francisco Jesus Rodriguez, Joan Reyes, Dulce Y. Medina, Miguel Angel Barron, Catalina Haro-Perez
KEYWORDS:
Luminescence, Zinc Sulfide, Blue Emission
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.9 No.7,
July
30,
2019
ABSTRACT: In this
work, the synthesis of undoped and Tm-doped ZnS nanoparticles is successfully
carried out by the polyol method. From XRD analyses, it was confirmed that both
types of particles possess the cubic zinc blend structure of the ZnS, and that
the structure is not altered by doping. The crystallite size computed by the
Scherrer equation is about 9 ± 1 nm. From photoluminescence analyses, the
results show that the excitation spectrum has two excitation peaks at 304 nm
and 356 nm; by exciting at 304 nm, a strong blue emission is observed at 420
nm, while exciting at 356 nm the characteristic Tm transition 1G4 → 3H6 is observed at 417 nm. By doping with Tm ions, the emission
color changes from pure blue to sky according to the change in CIE coordinates
from x = 0.15, y = 0.015 to x = 0.18, y = 0.17, respectively.