Luminescence properties of La2O3:Eu3+ nanophosphor prepared by sol–gel method

Abstract

a b s t r a c tUndoped and Eu 3+ doped La 2 O 3 nanophosphor are synthesized by low temperature sol-gel technique. The synthesized samples are characterized by X-ray diffraction (XRD) and average crystallite size is found to be $18 nm and $23 nm for undoped and Eu 3+ doped La 2 O 3 respectively. Gamma ray irradiated undoped La 2 O 3 shows high intense thermoluminescence (TL) glow peak at 640 K and weak TL glow peak at 443 K and the high intense peak intensity is sub linear increase with c-dose. Whereas Eu 3+ doped La 2 O 3 nanophosphor show a prominent TL glow peak at 640 K and its TL intensity linearly increases up to 1 kGy.The kinetic parameters are estimated using glow curve deconvoluted (GCD) technique. TL emission of cray irradiated Eu 3+ doped La 2 O 3 show peaks at 508, 586, 619 and 706 nm are attributed to Eu 3+ transition peaks.

A New Ultrafine Luminescent La2O3:Eu3+ Aerogel

“…One way to increase the light intensity of these ions is by inserting them into inorganic compounds (such as La 2 O 3 ), which promotes a transfer of energy to the metal ions and a breaking up of their structural symmetry, leading to an increase in emission intensity [ 29 ]. Also, lanthanum oxide has numerous industrial and technological applications [ 30 , 31 ], including use in luminescent displays and light-emitting diodes (LED) [ 32 ], and La 3+ ions can be easily replaced with luminescence-active Ln 3+ ions over a wide range of concentrations [ 33 ], due to their ionic radius, electronegativity [ 34 ], and electron structure [ 35 ], much like the other lanthanide ions. La 2 O 3 is recognized as an excellent host material for lanthanides in luminescence-related applications [ 36 ], and compared to other lanthanide host matrices, such as Gd 2 O 3 and Lu 2 O 3 , it is cheaper and, therefore, lends itself to more industrial and technological applications [ 37 , 38 ].…”

Effect of cobalt doping on structural, thermo and photoluminescent properties of ZnO nanopowders

“…The normal temperature synthesis process like sol-gel method, solution combustion method, precipitation method, etc. are found suitable to produce TM ion doped ZnO of high efficiency [7][8][9]. However, combustion synthesis is an important powder processing technique generally used to prepare oxide materials.…”