Color‐Tunable Eu³⁺ and Tb³⁺ Co‐Doped Nanophosphors Synthesis by Plasma‐Assisted Method

Abstract

With increasing health consciousness, Y 2 O 3 -based rare earth nanophosphors are considered as promising luminescent complexes for bio-applications. In the present study, an atmospheric pressure plasma-electrochemical technique is demonstrated for the synthesis of Eu 3 + /Tb 3 + single-doped or co-doped Y 2 O 3 nanophosphors from merely an aqueous solution of the corresponding rare earth nitrite salts. Systematic experiments were performed to prepare (Y 1-x-y Eu x Tb y ) 2 O 3 nanophosphors of various Tb 3 + and Eu 3 + ratios (x:y = 1:0, 2:1, 1:1, 1:2, and 0:1), with the ultimate goal to achieve the colour tunability by simply adjusting the dopant compositions. Results indicated successfulness synthesis of crystalline Eu/Tb single-doped and co-doped Y 2 O 3 nanophosphors with Tb 3 + and Eu 3 + ions being uniformly incorporated into the Y 2 O 3 host matrix. The generated products showed apparent downshift behaviour under ultraviolet irradiation, and characteristic spectral excitation and emission bands were detected by the photoluminescence measurement. Furthermore, by adjusting the relative composition ratios of the terbium and europium ions, the emission colours were shown to be regulated to a large extent. The demonstrated process can be characterized as simple, versatile and environmentally-friendly, featuring great flexibility in colour tunability, and therefore can present a considerable interest for emerging nanofabrication applications.

Eu‐doped ZnAl‐LDH as a Fluorescent Labeling Carrier for the Delivery and Controlled Release of Camptothecin

“…The fluorescent spectra of ZnAl‐Eu‐LDH, CPT, ZnAl‐Eu‐CPT, and ZnAl‐Eu under excitation at 395 nm are given in Figure 11. For the ZnAl‐Eu‐LDH, there are weak emissions at 596 and 620 nm which are attributed to the electric‐dipole ( 5 D 0 → 7 F 1 ) and magnetic‐dipole ( 5 D 0 → 7 F 2 ) transitions of Eu(III), respectively [59‐61] . The fluorescent peak of pure CPT is at 486 nm.…”

“…7 F 2 ) transitions of Eu(III), respectively. [59][60][61] The fluorescent peak of pure CPT is at 486 nm. While the CPT was intercalated into the LDH, a broad strong emission at 475 nm appeared for the corresponding ZnAl-Eu-CPT.…”

Microfluidic plasmas: Novel technique for chemistry and chemical engineering

“…nickel nanoparticles [124], titanium nitrides [59], yttrium nanoparticles [125], lanthanide doped yttria nanophosphors [126,127], N-doped carbon dots (N-CDs) [128], has been demonstrated.…”

Microplasmas for Advanced Materials and Devices

“…g) Raman spectra of Eu‐ and Tb‐doped Y 2 O 3 NPs synthesized using microplasma‐assisted liquid phase method. Reproduced with permission . Copyright 2019, Wiley‐VCH.…”

“…Yttrium oxide NPs have been successfully produced in a simple microplasma‐assisted liquid process operated at ambient pressure by reacting yttrium nitrate aqueous solution as the precursor (Figure g) . Furthermore, successful synthesis of crystalline Eu, Tb, and lanthanide (La) single‐doped and co‐doped yttrium oxide NPs has been reported (Figure h) . Optical spectroscopy studies indicate that the PL emission properties can be adjusted by the dopant concentrations in the yttrium oxide NPs, which in turn can be controlled by the plasma process conditions.…”