Journal ArticleDOI
Photoluminescence and thermoluminescence studies of Tb3+ doped ZnO nanorods
Partha P. Pal,J. Manam +1 more
TLDR
In this article, the synthesis of terbium doped zinc oxide (ZnO:Tb3+) nanorods via room temperature chemical co-precipitation was explored and their structural, photoluminescence (PL) and thermoluminecence (TL) studies were investigated in detail.Abstract:
Here in, the synthesis of the terbium doped zinc oxide (ZnO:Tb3+) nanorods via room temperature chemical co-precipitation was explored and their structural, photoluminescence (PL) and thermoluminescence (TL) studies were investigated in detail. The present samples were found to have pure hexagonal wurtzite crystal structure. The as obtained samples were broadly composed of nanoflakes while the highly crystalline nanorods have been formed due to low temperature annealing of the as synthesized samples. The diameters of the nanoflakes are found to be in the range 50–60 nm whereas the nanorods have diameter 60–90 nm and length 700–900 nm. FTIR study shows Zn O stretching band at 475 cm−1 showing improved crystal quality with annealing. The bands at 1545 and 1431 cm−1 are attributed to asymmetric and symmetric C O stretching vibration modes. The diffuse reflectance spectra show band edge emission near 390 nm and a blue shift of the absorption edge with higher concentration of Tb doping. The PL spectra of the Tb3+-doped sample exhibited bright bluish green and green emissions at 490 nm (5D4 → 7F6) and 544 nm (5D4 → 7F5) respectively which is much more intense then the blue (450 nm), bluish green (472 nm) and broad green emission (532 nm) for the undoped sample. An efficient energy transfer process from ZnO host to Tb3+ is observed in PL emission and excitation spectra of Tb3+-doped ZnO ions. The doped sample exhibits a strong TL glow peak at 255 °C compared to the prominent glow peak at 190 °C for the undoped sample. The higher temperature peaks are found to obey first order kinetics whereas the lower temperature peaks obey 2nd order kinetics. The glow peak at 255 °C for the Tb3+ doped sample has an activation energy 0.98 eV and frequency factor 2.77 × 108 s−1.read more
Citations
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Journal ArticleDOI
Temperature dependent selective and sensitive terbium doped ZnO nanostructures
TL;DR: In this article, the influence of terbium doping on structural, morphological, optical and gas sensing properties of zinc oxide has been studied and it was observed that doped samples have significantly high sensing response, temperature dependent selectivity toward ethanol and acetone, and sensors were able to detect even low concentration (∼10ppm) of these vapors.
Journal ArticleDOI
Enhanced red emission on co-doping of divalent ions (M2+ = Ca2+, Sr2+, Ba2+) in YVO4:Eu3+ phosphor and spectroscopic analysis for its application in display devices
Puja Kumari,J. Manam +1 more
TL;DR: The photometric characterizations and corresponding calculations indicated the suitability of the phosphor for display devices, and divalent ions introduced radiative defect centers, which enhances the PL intensity significantly.
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Enhanced light harvesting of dye-sensitized solar cells with up/down conversion materials
TL;DR: In this article, rare earth doped ZnO up/down conversion materials were prepared and introduced into photoelectrodes to enhance the photovoltaic efficiency of dye-sensitized solar cells.
Journal ArticleDOI
Microstructural and photoluminescence properties of sol–gel derived Tb3+ doped ZnO nanocrystals
G. L. Kabongo,G. L. Kabongo,Gugu H. Mhlongo,Thomas Malwela,Bakang Moses Mothudi,K.T. Hillie,K.T. Hillie,Mokhotjwa Simon Dhlamini,Mokhotjwa Simon Dhlamini +8 more
TL;DR: In this article, the photoluminescence properties of un-doped and Tb3+ doped ZnO nanocrystals were investigated by a sol-gel method.
Journal ArticleDOI
Hydrothermal synthesis, structural and luminescent properties of a Cr3+ doped MgGa2O4 near-infrared long lasting nanophospor
Amba Mondal,Sourav Das,J. Manam +2 more
TL;DR: In this article, a novel long lasting phosphor MgGa2O4:Cr3+ was successfully prepared by a hydrothermal method and a solid state reaction method.
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