Influence of Hydrogen Peroxide Addition on Photoluminescence of Y₂O₃:Eu³⁺ Nanophosphors Prepared by Laser Ablation in Water

Abstract

Y 2 O 3 :Eu 3+ red phosphors were synthesized by laser irradiation of Eu-doped Y 2 O 3 sintered targets immersed in water. The photoluminescence (PL) of the nanoparticles (NPs) was significantly enhanced by adding hydrogen peroxide to the water. Targets were synthesized using three methods, namely, sol-gel (SG), homogeneous-precipitation (HP), and solid-state reaction (SSR) followed by sintering. The sintered SG target contained 8.6 wt% of hexagonal oxygen-deficient byproduct, while the other targets were composed of pure cubic phase. The amount of hexagonal oxygen-deficient and monoclinic by-products in the nanophosphors increased to 33 wt% and 27 wt% in irradiated SG-and HP-derived targets, respectively. The SSRderived NPs were almost pure cubic phase. Addition of H 2 O 2 to the water minimized the amount of hexagonal oxygen-deficient and monoclinic byproducts (5.7 wt% and 6.4 wt% for SG-and HP-derived NPs respectively). Moreover, the PL of the NPs was enhanced by the formation of a pure cubic phase, and the optimum amount of added H 2 O 2 for maximum luminescence was 5 wt%. J. McKittrick-contributing editor Manuscript No. 33665.

Laser Synthesis and Processing of Colloids: Fundamentals and Applications

“…Additionally, the addition of H 2 O 2 during LAL of Zn has been reported to yield ZnO 2 NPs . Adding an oxidative reagent (H 2 O 2 ) to water during LAL synthesis of Eu 3+ :Y 2 O 3 NPs also improves PL emissions …”

“…199 Adding an oxidative reagent (H 2 O 2 ) to water during LAL synthesis of Eu 3+ :Y 2 O 3 NPs also improves PL emissions. 677 The interactions of colloidal NPs with local ions play critical roles in determining colloidal stability and the charges of LALsynthesized NPs because the nanoenvironment salinity and pH differ from those of the bulk liquid, as mentioned in the review by Pfeiffer et al 367 LAL-synthesized Au NPs, for example, are negatively charged because of their partial oxidization and hydroxyl anion adsorption in water, 123 leading to an intrinsic buffer capacity at the NP surface. 367 Dissolved anions affect LSPC in two opposing manners.…”

Tunable green to red ZrO2:Er nanophosphors

“…The synthesis of Ln 3+ doped oxides nanoparticles, such as YAG and Y 2 O 3 by PLAL were already reported in literature. [39][40][41][42][43][44][45] However, it is noteworthy that although there are studies on zirconia nanoparticles produced by PLAL, all works are about undoped zirconia. [46][47][48][49] Thus, the work here presented regarding erbium doped zirconia nanoparticles produced by pulsed laser ablation in water, constitutes a novelty, as far as we know.…”

Development of Er3+, Yb3+ Co-Doped Y2O3 NPs According to Yb3+ Concentration by LP–PLA Method: Potential Further Biosensor

“…After the collapse of the plasma plume, the particles can interact with radiation. This can lead to generation of the large size particles by small nanoparticles as a result of their melting and defragmenting ( Figure 4 c) [ 32 , 33 ]. Moreover, this process can form new compounds containing atoms from both the target and the liquid by these intermediate species in the plume collide [ 34 ], and react with molecules of the surrounding liquid through electrons attached, which become negatively charged and attract ions in the plasma [ 35 ].…”