In this study Cu<sup>2+</sup>+Eu<sup>3+</sup> co-doped ZnO(ZnO/Cu<sup>2+</sup>+Eu<sup>3+</sup>) solid solution powders were synthesized by solution combustion method usi...In this study Cu<sup>2+</sup>+Eu<sup>3+</sup> co-doped ZnO(ZnO/Cu<sup>2+</sup>+Eu<sup>3+</sup>) solid solution powders were synthesized by solution combustion method using as oxidant agent zinc nitrate hexahydrate and as fuel urea;the Cu<sup>2+</sup> concentrations were 0, 1, 2, 3, 10, and 20 %Wt;the Eu<sup>3+</sup> ion concentration was fixed in 3%Wt. The samples after were annealed at 900°C by 20 h in air. The structural results showed the largely presence of a wurtzite solid solution of Cu<sup>2+</sup>+Eu<sup>3+</sup>doped ZnO, at high Cu<sup>2+</sup> doping CuO and Eu<sub>2</sub>CuO<sub>4</sub> phases are also present. Morphological properties were analyzed using scanning electron microscopy (SEM) technique. However it is important to remark that the Cu<sup>2+</sup> ions suppress the Eu<sup>3+</sup> ion photoluminescence (PL) by means of an overlap mechanism between Cu<sup>2+</sup> absorption band and Eu<sup>3+</sup>emission band (e.g. <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>2</sub>) of the Eu<sup>3+</sup> emission spectra.展开更多
Eu3+ions doped Zn(OH)F and ZnO micro-structures with specific morphologies were synthesized by a simple hydrothermal method only through altering the addition amount of NH4F and hexamethylenetetramine(HMT).The phase s...Eu3+ions doped Zn(OH)F and ZnO micro-structures with specific morphologies were synthesized by a simple hydrothermal method only through altering the addition amount of NH4F and hexamethylenetetramine(HMT).The phase structure,morphology and luminescence properties of the as-prepared samples were characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),photoluminescence(PL)spectra and lifetime.The results indicate that the obtained Zn(OH)F:Eu^3+samples possess net-like and dandelion-like morphologies,which have an identical orthorhombic phase structure.It is found that the addition amount of raw materials such as NH4F and HMT plays a critical role for the formation of Zn(OH)F:Eu^3+.If the addition amounts of NH4F or HMT are reduced by half,the hexagonal ZnO:Eu^3+sample with peanut-like morphology can be obtained.Under the excitation of UV light,both the as-prepared Zn(OH)F:Eu^3+and ZnO:Eu^3+samples exhibit the characteristic emission of the doped Eu^3+.展开更多
文摘In this study Cu<sup>2+</sup>+Eu<sup>3+</sup> co-doped ZnO(ZnO/Cu<sup>2+</sup>+Eu<sup>3+</sup>) solid solution powders were synthesized by solution combustion method using as oxidant agent zinc nitrate hexahydrate and as fuel urea;the Cu<sup>2+</sup> concentrations were 0, 1, 2, 3, 10, and 20 %Wt;the Eu<sup>3+</sup> ion concentration was fixed in 3%Wt. The samples after were annealed at 900°C by 20 h in air. The structural results showed the largely presence of a wurtzite solid solution of Cu<sup>2+</sup>+Eu<sup>3+</sup>doped ZnO, at high Cu<sup>2+</sup> doping CuO and Eu<sub>2</sub>CuO<sub>4</sub> phases are also present. Morphological properties were analyzed using scanning electron microscopy (SEM) technique. However it is important to remark that the Cu<sup>2+</sup> ions suppress the Eu<sup>3+</sup> ion photoluminescence (PL) by means of an overlap mechanism between Cu<sup>2+</sup> absorption band and Eu<sup>3+</sup>emission band (e.g. <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>2</sub>) of the Eu<sup>3+</sup> emission spectra.
基金Project supported by the National Natural Science Foundation of China(51572303)
文摘Eu3+ions doped Zn(OH)F and ZnO micro-structures with specific morphologies were synthesized by a simple hydrothermal method only through altering the addition amount of NH4F and hexamethylenetetramine(HMT).The phase structure,morphology and luminescence properties of the as-prepared samples were characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),photoluminescence(PL)spectra and lifetime.The results indicate that the obtained Zn(OH)F:Eu^3+samples possess net-like and dandelion-like morphologies,which have an identical orthorhombic phase structure.It is found that the addition amount of raw materials such as NH4F and HMT plays a critical role for the formation of Zn(OH)F:Eu^3+.If the addition amounts of NH4F or HMT are reduced by half,the hexagonal ZnO:Eu^3+sample with peanut-like morphology can be obtained.Under the excitation of UV light,both the as-prepared Zn(OH)F:Eu^3+and ZnO:Eu^3+samples exhibit the characteristic emission of the doped Eu^3+.
