In this paper, we study the computational modeling of the localized surface plasmonic and scattering field
effect arising from of gold nanorods. We also report the synthesis and optical characterization of core-spacer-shell
nanocomposites composed of gold nanorods coated with SiO2 and finally coated with Y2O3:Er3+/Yb3+
(Aunanorods@mSiO2@Y2O3:Er3+/Yb) through a layer-by-layer method. Preliminary upconversion analysis of singly
(Aunanorods@mSiO2@Y2O3:Er3+/Yb) at 980 excitation indicates that the composition has to be optimized to
understand the role of silica as a spacer and near field enhancer (gold nanorod) in the system.
In this paper, we discuss the concept of an efficient infrared upconverting phosphor as an energy converting material that
could potentially improve the efficiency of Si solar cells in bifacial configuration. Basic spectroscopic studies of Yb and
Er-doped La2O2S phosphor was reported with particular attention to its upconversion properties under 1550 nm
excitation. Different concentrations of phosphors were synthesized by solid state flux fusion method. The phosphor
powders were well crystallized in a hexagonal shape with an average size 300-400 nm. The most efficient upconverting
sample (1%Yb: 9% Er doped La2O2S) was also studied under the illumination with infrared (IR) broad band spectrum
above 1000 nm. Our measurements show that even with an excitation power density of 0.159 W/cm2 using a tungsten
halogen lamp the material shows efficient upconversion corroborating the fact that the present phosphors could be
potential candidates for improving the efficiency of the present Si solar cells.
Yb and Er-doped Y2O2S phosphor was synthesized by solid state flux fusion method and their upconversion spectral
properties were studied as a function of different Yb concentrations. The solid state flux fusion results in well
crystallized hexagonal shaped phosphor particles of average size 3.8 μm. The detailed optical characterizations such as
absorption, emission, and fluorescence decay were performed to explore the emission processes in the UV-VIS-NIR as
well as to quantitatively estimate the fluorescence quantum yield. Upconversion spectral studies show that for all the
compositions, green emissions are stronger, particularly; the green emission intensity is 1.7 times stronger than the red
one with composition of 8 mol% Yb and 1 mol% Er. Mechanisms of upconversion by two photon and energy transfer
processes are interpreted and explained. The color coordinates are measured and the color tunability was analyzed as a
function of the 980 nm excitation power. Results show that the Y2O2S:Yb,Er phosphor offers power dependent color
tuning properties where the emission color can be tuned from 490 to 550 nm by simply changing the 980 nm excitation
power from 10 to 50 mW.
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