Author/Authors :
Xiang-Hong He، نويسنده , , Ying Zhu، نويسنده ,
Abstract :
CaS:Eu2+ red-emitting phosphors particles,
were prepared by the precipitation method, followed by
sintering in the atmosphere over the mixture of sulfur
powder, Na2CO3, and carbon-containing compounds such
as tartaric acid, citric avid, glucose, and cane sugar. The
structure, morphology and photoluminescence performance
of the as-prepared samples were investigated by
X-ray powder diffraction (XRD), transmission electron
microscopy (TEM), and photoluminescence spectrum (PL),
respectively. The influences of carbon-containing additives
on its crystallization behavior, morphology, and enhancement
in luminescence of CaS:Eu2+ particles were studied.
CaS:Eu2+ particles without additive show inhomogeneous,
rough and aggregation with the size of 75–125 nm, but the
spherical particles with mean size of about 110 nm were
obtained by adding carbon-containing compounds. Compared
with phosphor without additive, the addition of
carbon-containing materials induced a remarkable increase
of PL, in the order of cane sugar, glucose, citric acid, and
tartaric acid. This enhancement is duo to the improvement
of crystallinity, particle morphology and size distribution
of the samples by adding carbon-containing additive.
