Influence of Er³⁺ concentration on the photoluminescence characteristics and excitation mechanism of Gd₂O₃:Er³⁺ phosphor synthesized via a solid‐state reaction method

Abstract

An Er(3+) -doped phosphor of Gd2O3(Gd2O3:Er(3+)) was prepared using a conventional solid-state reaction method. The structure and particle size were determined from X-ray powder diffraction measurements. The average particle size of the phosphor was in between 20 and 50 nm. The particle size and structure of the phosphor were further confirmed by transmission electron microscopy (TEM) analysis. Luminescence spectra were recorded under excitation wavelengths of 275, 380, 515 and 980 nm. The visible upconversion and downconversion luminescence spectra of the Gd2O3:Er(3+) phosphor were investigated as a function of Er(3+) ion concentration. The upconverted emission at 980 nm excitation shows enhanced red emission with respect to green emission as the dopant concentration increased. Similar results were observed for downconversion emission under 275 and 380 nm excitation wavelengths. The mechanisms responsible for populating the (4)S3/2 and (4)F9/2 levels, for green and red emissions, respectively, are different for different excitations and for different concentrations of Er(3+).

Photoluminescence behavior of ZrO2: Eu3+ with variable concentration of Eu3+ doped phosphor

“…The precursor materials were weighed in stoichiometric ratio and grounded by using mortar and pestle. The mixture were transferred into alumina crucible and placed in a muffle furnace followed by heating at 1200 C for 3 h (Tamrakar, Bisen, & Brahme, 2014a, 2014cTamrakar, Bisen, Robinson, Sahu & Brahme, 2014;Tamrakar, Bisen, Upadhyay & Brahme, 2014;.…”

Structural characterization and photoluminescence properties of zinc oxide nano particles synthesized by chemical route method

“…Till today, many different techniques to produced nano range phosphor such as spray pyrolysis (Santana, Vacio & et al, 1999), plasma-enhanced chemical vapor deposition (Kim & Kim, 1999), sol gel (Bao, Gu, & Kuang, 1988), sputtering (Subramanya, Naidu, & Uthanna, 2000); solid state reactions (Tamrakar, Bisen, Upadhyay & Tiwari, 2014;Tamrakar, Bisen, & Brahme, 2015;Tamrakar, 2015a, 2015b), coprecipitation (Bisen, Sharma, Brahme, & Tamrakar, 2009) and combustion Tamrakar, Bisen, and Brahme 2014a, 2014b, 2014c etc have been used, but in recent times much interest has been generated around the chemical route technique (Dubey et al, 2014;Ezema and Azogwa, 2003). The technique is simple cost; effective, reproducible and the material are readily available (Ezema, Ekwealor, Osuji, 2007;Ezeme & Okeke, 2002;Ezema et al, 2007).…”

Emerging green light emission of Er3+‐activated single phased GdAlO3 phosphors for lighting applications

“…The emission bands were obtained at 409 nm (in the blue region), 521 nm (in the green region), 546 nm (in the green region) and 662 nm (in the red region) with 2 H 9/2 → 4 I 15/2 , 2 H 11/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 and 4 F 9/2 → 4 I 15/2 correspondingly, as shown in Table 6. [ 41 ] In the present case, the most intense band at 546 nm (in the green region) with electronic transition 4 S 3/2 → 4 I 15/2 is responsible for the green color in the considered nanosamples. The emission spectra of optimized Gd 0.95 AlO 3 :0.05Er 3+ phosphors produced at several temperatures are exhibited in Figure 13, which demonstrate that there is no appreciable change in the shape and peak locations.…”