Photoluminescence, electro- and thermal catalytic properties of bare and Eu(III)-doped GaOOH, α- and β-Ga2O3 nanorods

Electrochemical Recovery and Behaviors of Rare Earth (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb) Ions on Ni Sheets

“…To further confirm the oxidation state of Eu elements, photoluminescence spectroscopy was employed for the Eu electrodeposited sample because Eu(III) ion has unique 5 D 0 → 7 F 0,1,2,3,4 transitions in the visible region between 550 and 720 nm [ 37 , 38 , 39 , 40 ], while Eu(II) shows no visible light emission under an excitation of UV light. Figure 7 shows excitation and emission spectra for a thick electrodeposited Eu sample and the corresponding 2D- and 3D-PL contour mapping images.…”

“…The PL intensity of the direct transition to an Eu(III) excited energy level was found to be stronger than that of the indirect transition. Several PL peak positions were commonly observed at 578, 590, 613, 647, and 698 nm, commonly associated to the 5 D 0 → 7 F 0 , 5 D 0 → 7 F 1 , 5 D 0 → 7 F 2 , 5 D 0 → 7 F 3 , and 5 D 0 → 7 F 4 , transitions, respectively [ 37 , 38 , 39 , 40 ]. The 5 D 0 → 7 F 2 transition was observed to be the most intense.…”

Structure and photocatalytic performance of rice husk-like Ba-doped GaOOH under light irradiation

“…All the samples prepared by us were white with the naked eyes, which meant that samples had no photoresponse in the visible range. 45 The Kubelka-Munk transformation method was used in our experiment to calculate absorbance. The optical absorption near the band edge of the crystalline semiconductors meets the formula: 46,47 ahn ¼ A(hn À E g ) n , where a, n, E g , and A are absorption coefficient, light frequency, band gap, and proportional constant, respectively.…”

One-step solvothermal synthesis and growth mechanism of well-crystallized β-Ga2O3 nanoparticles in isopropanol

“…With regard to its optical properties, β-Ga 2 O 3 is almost transparent, and β-Ga 2 O 3 nanoparticles have been demonstrated to exhibit photoluminescence upon doping. [8][9][10][11][12][13][14][15][16][17] In addition to these applications, β-Ga 2 O 3 has potential use in catalysis, 18,19 solar cells, 20 and gas sensors. 21 β-Ga 2 O 3 nanoparticles are also used as precursors in the synthesis of GaN nanoparticles via the nitration process.…”