Red luminescence from hydrothermally synthesized Eu-doped ZnO nanoparticles under visible excitation

Abstract

Eu-doped ZnO nanoparticles were synthesized by hydrothermal method. The Eu-dopant concentration has been varied by varying the amount of Eu-dopant concentration. These nanoparticles were structurally characterized by X-ray diffraction, transmission electron microscopy and selected area electron diffraction and it confirms the formation of nanoparticles having standard wurtzite structure. Photoluminescence studies show that these nanoparticles exhibit a sharp red luminescence due to the intra-4 f transitions of Eu 3+ ions at an excitation of 397 nm and 466 nm. Luminescence quenching is observed in the nanoparticles as the Eu-dopant concentration increases. Incorporation of Eu in the nanoparticles was confirmed by the energy dispersive X-ray studies.

Lanthanide-doped semiconductor nanocrystals: electronic structures and optical properties

“…Recently, Complex precursor method. [47] ZnO Eu, Er Hydrothermal [22,48,49] Er Atomic layer deposition [50] Dy, Tb, Er Isocrystalline core-shell (ICS) protocol [51] Eu, Pr Hydrothermal [52−54] Eu Electrochemical deposition [55] Er Ligand-capped/ligand-exchanging [56] Pr, Sm, Tb, Ho, Tm, Eu Sol-gel [17,57−59] Dy, Yb, Pr, Sm, Er Sol-gel [60−63] Er, Eu Chemical combustion [64,65] SnO 2 Nd Deposition [66] Eu Co-decomposition [38] Eu Impregnation and decomposition cycle [67] Eu Thermal evaporation [68] Er, Eu, Solvothermal [69−71] Tm Implantation [72] Eu Microwave synthesis [21] Eu Solid state chemical reaction [73] Er, Yb, Eu …”

Red luminescence of Zn /ZnO core–shell nanorods in a mixture of LTZA/Zinc acetate matrix: Study of the effects of Nitrogen bubbling, Cobalt doping and thioglycolic acid

“…Especially their luminescence properties have been extensively studied due to their application for light emitting diodes (LEDs) and laser fabrication [1][2][3][4][5][6][7][8][9][10][11][12][13]. Room temperature visible emission of ZnO nanostructures from blue to red wavelengths has been reported by many groups [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. The green, yellow and red light emissions which are attributed to the deep level emission bands have previously been attributed to several defects in the ZnO crystal structure, e.g.…”

“…O vacancy (V O ) [13] Zn vacancy (V Zn ) [14], O interstitial (O i ) [15] and Zn interstitial (Zn i ) [16,17]. The key role in the luminescence properties of ZnO nanostructures have been realized to be defect engineering [8,[17][18][19][20][21][22][23][24][25][26][27]. The defects have been extensively manipulated by insertion of doping agents into the ZnO crystal structure.…”

Effects of mineralizing agent on the morphologies and photoluminescence properties of Eu3+-doped ZnO nanomaterials

“…Up to now, various techniques have been developed for controlling shape, size and structures of such nanomaterials [12][13][14][15][16][17][18][19]. Moreover, the spontaneous emission probability of rare-earth doping nanoparticles can be significantly modified by changing the particle size, shape and surrounding medium [20][21][22][23][24][25]. However, the investigation about the Eu-doped ZnO nanomaterials with different morphology, in particular, the effects of various mineralizing agents on their morphologies and photoluminescence properties are limited [26,27].…”