**1. Introduction**

These days, rare earth oxide luminescent materials have pulled in incredible consideration because of their size, shape, and phase-dependent luminescent behavior, which make them reasonable for various applications. Among various groups of crystalline materials, oxide crystal is of incredible enthusiasm because of their exceptional optical properties, for example, long fluorescent lifetime, extensive Stokes shift, positive physical and chemical properties, and also great photochemical stability. A few of the rare earth components and their relating oxides are of exceedingly specialized significance and are utilized in basic parts. Rare earth oxides are this sort of cutting edge materials, which are generally utilized as elite luminescent gadgets, magnets, catalyst, and other useful materials, for example, electronic, attractive, atomic, optical, and synergist gadgets [1].

Lanthanide hydroxides and oxides have effectively been examined as a result of their extensive variety of utilizations including dielectric materials for multilayered capacitors, luminescent lights and shows, strong laser gadgets, optoelectronic information stockpiles, and waveguides. Lanthanide-doped oxide nanoparticles are of unique interests as potential materials for a vital new class of nanophosphors. At the point when connected for a fluorescent naming, they present a few focal points, for example, sharp emanation spectra, long-life times, and obstruction against photobleaching in examination with ordinary natural fluorophores and quantum spots [1, 2].

Gadolinium oxide (Gd2O3) is one of the good choices to researchers for luminescence behavior because it has high refractive index (2.3), high optical transparency, great thermal and chemical stability, high dielectric consistent, and low phonon energy among the group of oxide [3–6]. Due to these positive properties, it displays various applications, for example, oxygen gas sensors, anode materials for sensors, optoelectronic gadgets, high definition TVs, medical imaging, high temperature superconducting materials, phenomenal UV light safeguard, photograph impetus, remedial impacts on malignant growth treatment-improving the impact of radiation on destructive cells while diminishing harm to typical cells, luminescent inks, paint and color sunscreen beautifiers, and luminescent materials [7].

Gadolinium oxide-based nanophosphors are observed to guarantee hopefuls in the field of superior luminescent gadgets, catalysis, and other practical gadgets dependent on their great electronic, optical, and physico-concoction reactions emerging from 4f electrons. Of course, every one of these properties could be to a great extent affected by their synthetic synthesis, precious stone structure, shape, and dimensionality. In this way, high surface region nanomaterial, which has a bigger part of deformity locales per unit zone, ought to be of enthusiasm as adsorbents in ecological remediation forms. Cost of amalgamation, effortlessness, and morphological attributes of arranged phosphor are vital parameters for their utilization in the business applications as it is basic that a self-spreading ignition course offers the best decision for the blend of Gd2O3 powder [2, 7].

Nanoparticles arranged by combustion synthesis have size of ~10 nm; such methodologies include the utilization of organic fuels such as urea, glycine, and so forth to start deterioration response of precursor metal salt at high temperature. The higher reactivity of littler size Gd2O3 particles is not simply because of the vast explicit surface region, yet in addition, because of the high concentration of low planned destinations and basic imperfections on their surface. Because of these benefits, these are sought after for different innovative applications including optoelectronic gadgets, top quality TVs, organic imaging and labeling, MRI, luminescent paints and inks for security codes, and so forth [8].

In the present work, combustion synthesis has been used for preparation of gadolinium oxide by utilizing glycerin and urea as a fuel. The union and portrayal of gadolinium oxide through various strategies have pulled in impressive consideration. The fuel and metal nitrate get deteriorated and give combustible gases, for example, NH3, CO2, and NO2. At the point when the arrangement achieves a point of sudden ignition, it starts consuming and turns into a consuming strong. The ignition proceeds until the point that all the combustible substances have wore out, and it ends up being a free substance with voids and pores framed by the getting away gases amid the burning response. The entire procedure takes just a couple of minutes to yield powder of oxide. The auxiliary and optical portrayals of the incorporated powders were completed utilizing X-beam powder diffractometer. Checking electron microscopy (SEM) was utilized to show the development of crystallites, and TEM was utilized for molecular measure affirmation. Fourier Transform Infrared Spectroscopy (FTIR) range of Gd2O3 nanopowder was acquired by utilizing FTIR spectrophotometer (Model; MIR 8300TM) with KBr blend in the pellet shape. The Raman and X-ray photoelectron spectroscopic studies of the prepared phosphor were also carried out.
