Luminescence studies of europium doped yttrium oxide nano phosphor

Abstract

a b s t r a c tLuminescence exhibiting europium doped yttrium oxide (Y 2 O 3 :Eu 3+ ) phosphor was prepared by solution combustion method, using disodium ethylene diamine tetra acetic acid (EDTA-Na 2 ) as fuel at ∼350 • C. Powder X-ray diffraction (PXRD) pattern of Y 2 O 3 :Eu 3+ revealed the cubic crystalline phase. The morphology of the samples was studied by scanning electron microscopy (SEM) and was foamy, fluffy and porous in nature. Fourier transformed infrared spectroscopy (FTIR) revealed prominent absorption with peaks at 3415, 1435, 875 and 565 cm −1 . Optical absorption studies showed the energy gap of the synthesized samples to be 5.4-5.5 eV. The photoluminescence (PL) of Y 2 O 3 :Eu 3+ exhibiting emission peak at 611 nm under the excitation of 254 nm. Thermoluminescence of ␥-irradiated Y 2 O 3 :Eu 3+ showed two well resolved TL glows with peaks at 460 and 610 K and they were analyzed by glow curve shape method and the activation energies were found to be 0.421 eV and 1.016 eV respectively.

Luminescence performance of europium-doped yttrium oxide thin films

“…A more reduced symmetry of these sites would result in the enhanced luminescent properties [38]. The supra linearity function f(D) is defined as: for the two glow peaks [17,39].…”

“…And, such materials may be investigated for their probable application as TL dosimeters or scintillating detectors [15][16][17].…”

Role of Li ion on luminescence performance of yttrium oxide thin films

“…The absorption peak at 875 cm À1 became stronger and sharp. It indicating that the 'Li' ion responsible for better crystallinity in Y 2 O 3 thin film [27]. The EDTA-Na 2 can chelate with metal precursors dissolved as an ionic form in water.…”

“…TL glow curves of the g-irradiated Y 2 O 3 thin films were recorded in the temperature range of 350e700 K at a heating rate of 5 K s À1 using a homemade TL set up and the substrates readings were omitted. The homemade TL set up has inbuilt a small metallic plate as heating strip, temperature programmer, photomultiplier tube (RCA 931B) and interfaced with a multimeter recorder (Rishicom) [27]. Fig.…”

Cathodo-, Thermo-, and Photoluminescent Properties of Nano-Y2O3:Eu3+Fabricated by Controlled Combustion Synthesis

“…High luminescence efficiency, long term thermal stability, high mechanical resistance, very good refractory properties, and chemical stability are interesting properties of Y 2 O 3 :Ln 3+ [5]. Among them nano-Y 2 O 3 :Eu 3+ has a great interest for application not only in the field emission display [6] and security printing [7] for electroluminescence [8], but also in biomedicine [9]. Nanoparticles synthesized by different methods show variation in their size, shape, and optical properties.…”