Photoluminescence properties of gadolinium oxide nanophosphor

Abstract

Abstract. In this paper, we report low temperature solution combustion synthesis and characterization of rare earth oxide (Gd 2 O 3 ) nanocrystalline phosphor. During the synthesis, glycine was used as a fuel. The final product was examined by well characterized techniques such as powder X-ray diffraction pattern (PXRD), UV-Visible absorption spectroscopy, photoluminescence (PL) measurements etc. The average crystallite size of the Gd 2 O 3 nanophosphor was estimated using Scherrer's formula and found to be 36 nm. The UV-Visible absorption peaks observed at~243 and~305 nm. Further the band gap of 900°C for 3 h calcined Gd 2 O 3 nanophosphor were estimated by Wood and Tauc relation and it was found to be~5.4 eV. A broad PL emission band at~380 nm was observed at 230 nm excitation. According to Wang's proposal, this emission band may be attributed to recombination of a delocalized electron close to the conduction band with a single charged state of surface oxygen vacancy.

Study on Electrical conductivity and Activation Energy of doped Ceria nanostructures

“…The band below 800 cm −1 shows the presence of Ce-O bond stretching modes [10]. The band below 550 cm −1 is due to Gd-O bond vibrations [11]. The broad band near 3300 cm −1 and band at 1650 cm −1 are mainly due to the hydroxyl group stretching vibration [12].…”

Impedance Spectroscopic Studies of B2O3-Substituted CeO2-Gd2O3 Systems

“…14,35 The vibrations of the Gd-O bond are identified by the bands near 550 cm À1 . 36 The band near 1049 cm À1 indicates the presence of B-O-B bond stretching vibrations. 37 The broad band near 3300 cm À1 and bands near 1650 cm À1 are mainly due to the -OH group stretching vibrations and H 2 O bending mode.…”

Bulk Yttria as a Host for Lanthanides in Biomedical Applications: Influence of Concentration Gradients on Structural, Mechanical, Optical, and in Vitro Imaging Behavior

“…Two absorption bands are prominent in the UV region for Gd 3+ doped Y 2 O 3 systems, ∼275 and ∼350 nm corresponding to 8 S 7/2 to 6 I J/2 and 8 S 7/2 to 6 P 7/2 transitions of Gd 3+ . Moreover, ∼275 nm has been more prominent in high concentrations of Gd 3+ namely for 8YG and 10YG . Eu 3+ substitutions perceived bands at 377, 394, 464, and 533 nm respective of 7 F 0 → 5 D 4 , 7 F 0 → 5 L 6 , 7 F 0 → 5 D 2 , and 7 F 0 → 5 D 1 transitions, while Nd 3+ substitutions covered the absorption in all UV–vis/NIR regions.…”

“…Moreover, ∼275 nm has been more prominent in high concentrations of Gd 3+ namely for 8YG and 10YG. 34 Eu 3+ substitutions perceived bands at 377, 394, 464, and 533 nm respective of 7 F 0 → 5 D 4 , 7 F 0 → 5 L 6 , 7 F 0 → 5 D 2 , and 7 F 0 → 5 D 1 transitions, 35 6a) excited at 980 nm displayed typical emission bands at 1011, 1032, 1077, and 1113 nm that correspond to stark level transition among 2 F 5/2 and 2 F 7/2 electronic states. 37 However, a gradual concentration quenching has been witnessed with the increments in Yb 3+ content.…”