Double-doped Samples Research Articles

Luminescence and temperature sensing properties of Y2-x-yTmxSmyMgTiO6 phosphors

Double perovskite materials have become the first choice of luminescent matrix materials in recent years due to their advantages of more flexible, easy doping and stable performance. A series of Y2-x-yTmxSmyMgTiO6 (0 ≤ x ≤ 0.5, 0 ≤ y ≤ 0.2) phosphors were prepared by high temperature solid-state method using different concentrations of Tm3+ and Sm3+ as dopants. The X-ray diffraction spectrum (XRD), photoluminescence spectrum (PL), fluorescence lifetime curve and X-ray excitation luminescence spectrum (XEL) of the phosphors were measured. The measurement results show that the dopants Tm3+ and Sm3+ enter the host lattice and replace part of the position of Y3+. The Tm3+ -doped sample emits strong blue light (458 nm) under 360 nm excitation, and the Sm3+ -doped sample has obvious emission peaks at 568 nm, 605 nm, 652 nm and 715 nm under 409 nm excitation. The energy transfer behavior of Tm3+→Sm3+ exists in the double doped samples. The energy transfer mechanism is consistent with the mechanism of concentration quenching in the system. Tunable luminescence can be realized by changing the doping concentration and excitation wavelength, which has great application value in the field of LED lighting. The energy transfer process and energy transfer efficiency in the system can be determined from the fluorescence lifetime curve of the sample. The phosphor can be effectively excited by X-ray, and the sample has good heat resistance and radiation resistance, which can be applied to the field of X-ray imaging. In addition, the thermal excitation effects of temperature on the 4G5/2 → 6H5/2 (568 nm) and 4G5/2 → 6H7/2 (605 nm) characteristic transitions of Sm3+ are different. Optical temperature measurement can be realized by using the fluorescence intensity ratio of I568 nm/I605 nm. Good temperature measurement performance and temperature measurement range have obvious advantages in the field of non-contact optical temperature measurement.

Energy Transfer in Dy3+ and Tb3+ Double-Doped Barium Borate Glass

In this work, single- and double-doped Dy3+ and Tb3+ barium borate glasses are investigated for their potential as light converters. The density and the absorption coefficient show linearly increasing trends with an increasing lanthanide content. The external quantum efficiency of the double-doped samples is a combination of the respective single-doped samples. The strong energy transfer from Dy3+ to Tb3+ results in an intense Tb3+-related emission, i.e., an intense green luminescence. Thus, excitation at a Dy3+-related wavelength of 452 nm enables a Tb3+-related emission, at which a single-doped Tb3+ sample barely shows any luminescence. Lifetime measurements show that there is not only an energy transfer from Dy3+ to Tb3+, but also vice versa.

A Triple-Doped Phosphor Strategy for the Conversion of Cool and Warm White Light.

This work proposes a new type of Eu2+, Ce3+, Mn2+ codoped strategy that can be adapted to both ultraviolet (UV) and blue chips to achieve high-quality white light illumination. Primarily, the target sample was confirmed by X-ray diffraction (XRD) and Rietveld refinement, and the surface morphology and element distribution were observed by scanning electron microscopy (SEM). Second, the energy transfer behavior and mechanism were determined by studying double-doped samples. Lu2Mg2Al2Si2O12: Eu2+,Ce3+ (LMAS: Eu2+,Ce3+) can realize an emission color adjustment from blue to yellow. The emission color of LMAS: Ce3+,Mn2+ can be adjusted from light yellow to orange yellow. Afterward, the triple-doped sample exhibits full-spectrum emission under the excitation at 365 nm, and yellow emission under the excitation at 450 nm. When combined with a 365 nm chip, the obtained light-emitting diode (LED) devices can achieve warm white light with a color rendering index (Ra) of 96.6, light emission (LE) of 1.79 lm/W, and correlated color temperature (CCT) of 4874 K. When this phosphor was combined with a 460 nm chip, cold white light with Ra = 70, LE = 13.57 lm/W, and CCT = 5782 K can be achieved. Finally, according to the properties of the phosphor, a conceptual diagram of a new type parallel device was designed, which can easily and effectively realize the conversion of cold and warm white light. This work provides a new idea for the design of single-substrate white light phosphor and proposes a new parallel device concept, which is expected to be applied in the field of lighting.

Luminescence Performance of BaGd2ZnO5 Microcrystalline Powder Doped with Different Rare Earth Ions

A group of BaGd2ZnO5 microcrystalline powders doped with Sm[Formula: see text], Dy[Formula: see text], Nd[Formula: see text] and Er[Formula: see text]/Yb[Formula: see text] were prepared by high temperature solid phase method, respectively. X-ray diffraction (XRD) analysis confirmed that all the products were pure BaGd2ZnO5 crystals, belonging to orthorhombic system and Pbnm space group. The emission spectra of Sm[Formula: see text], Dy[Formula: see text], Nd[Formula: see text] single-doped and Er[Formula: see text]/Yb[Formula: see text] double-doped samples under specific wavelength excitation were measured. The change of luminescence intensity at strong emission peak with doping concentration of doped ions was studied, and concentration quenching effect was found. The CIE color coordinates of the prepared samples were calculated. The results show that all coordinates doped with Sm[Formula: see text] are located in the orange red region. All coordinates of Dy[Formula: see text] doping samples are located in the yellow light region, but close to the white light region. All coordinates of Nd[Formula: see text] doping sample are located in the blue-green region. The upconversion luminescence of Er[Formula: see text]/Yb[Formula: see text] co-doped sample belongs to yellow light region.

Synthesis and characterization of magnesium-lanthanum dual doped bioactive glasses

Dual ion-doped bioactive glass has drawn high attention during recent years because of well-improved therapeutic characteristics and mechanical properties. In this study, 5 different ion-doped (1 wt% Lanthanum with 0, 1, 2.5, 5, and 10 wt% Magnesium) 58S bioactive glasses (BGs) were synthesized. The physicochemical results revealed that Lanthanum (La) and Magnesium (Mg) ion doping has been successfully done. Mechanical characterization results depicted that La-doped and Mg-La double doped samples with Mg less than 2.5 wt% had higher diametral tensile strength compared to BG and other co-doped samples. However, Vickers hardness values were not affected by ion dopings. Apatite formation and bioactivity were also improved in double ion-doped samples, especially in those with the higher magnesium content. Cell culture studies showed that synthesized BGs were not cytotoxic. Especially, groups having 2.5 to 5 wt% Mg showed the highest cell viabilities at day 7. Results indicated that Mg- La dual doped bioactive glasses possess improved properties compared to BG, and thus, have potential for bone regeneration applications.

Tunable greenish-to-reddish light generation via energy transfer in Tb3+/Sm3+-codoped PbGeO3:PbF2:CdF2 glass under UV excitation

Generation of tunable greenish–yellowish–reddish luminescence mediated by energy transfer in Tb3 + / Sm3 + -codoped fluorogermanate glass under UV light excitation is reported. Fluorescence emissions around 487, 542, 561, 582, 600, 620, 645, 650, and 706 nm were obtained in double-doped samples under 355- and 375-nm excitation wavelengths. The relative intensity of the Sm3 + and Tb3 + ions’ individual distinctive emissions depends upon the excitation wavelength, relative ions concentration, and the energy transfer of Tb3 + to Sm3 + mechanism, which lead to the tonality tunable overall luminescent color. The CIE-1931 chromaticity coordinates of the overall luminescence resided in the range (0.31; 0.59) to (0.62; 0.37). Time decay measurements indicated efficient Tb3 + to Sm3 + energy-transfer process with a substantial decrease (1.65 to 0.85 ms) of Tb3 + emitting levels due to the presence of Sm3 + ions in the host matrix.

Structural studies on copper and nitrogen doped nanosized anatase

Abstract Pure TiO2, N- and Cu-doped and double-doped (Cu, N) samples were synthesized via sol–gel route in order to investigate the local and average structure of the crystalline TiO2 synthesized under different pH conditions. Samples are mainly constituted of anatase phase, even though low but significant amounts of secondary brookite grew in most samples. A detailed structural characterization was performed by means of synchrotron X-ray elastic scattering experiments; structural data of the different samples were obtained by means of the Rietveld refinement, whereas insights about their local structure were gained by means of the pair distribution analysis.

Transformational dynamics of BZO and BHO nanorods imposed by Y2O3 nanoparticles for improved isotropic pinning in YBa2Cu3O7-δ thin films

An elastic strain model was applied to evaluate the rigidity of the c-axis aligned one-dimensional artificial pinning centers (1D-APCs) in YBa2Cu3O7-δ matrix films. Higher rigidity was predicted for BaZrO3 1D-APCs than that of the BaHfO3 1D-APCs. This suggests a secondary APC doping of Y2O3 in the 1D-APC/YBa2Cu3O7-δ nanocomposite films would generate a stronger perturbation to the c-axis alignment of the BaHfO3 1D-APCs and therefore a more isotropic magnetic vortex pinning landscape. In order to experimentally confirm this, we have made a comparative study of the critical current density Jc (H, θ, T) of 2 vol.% BaZrO3 + 3 vol.%Y2O3 and 2 vol.%BaHfO3 + 3 vol.%Y2O3 double-doped (DD) YBa2Cu3O7-δ films deposited at their optimal growth conditions. A much enhanced isotropic pinning was observed in the BaHfO3 DD samples. For example, at 65 K and 9.0 T, the variation of the Jc across the entire θ range from θ=0 (H//c) to θ=90 degree (H//ab) is less than 18% for BaHfO3 DD films, in contrast to about 100% for the BaZrO3 DD counterpart. In addition, lower α values from the Jc(H) ∼ H-α fitting were observed in the BaHfO3 DD films in a large θ range away from the H//c-axis. Since the two samples have comparable Jc values at H//c-axis, the improved isotropic pinning in BaHfO3 DD films confirms the theoretically predicted higher tunability of the BaHfO3 1D-APCs in APC/YBa2Cu3O7-δ nanocomposite films.

Luminescent properties of blue green Sr3Al2O5Cl2:Pr3+ and orange red Sr3Al2O5Cl2:Eu2+, Pr3+ afterglow phosphors

The Sr3Al2O5Cl2:Eu2+, Pr3+ phosphor has been synthesized via high temperature solid state reaction. The X-ray powder diffraction confirms that the obtained samples are pure orthorhombic Sr3Al2O5Cl2 phases, with a space group of D24-P212121. Blue green emission is observed when the sample is doped with Pr3+ ions and an orange red emission with Eu2+ ions doping. Both of the samples show obvious afterglow emission. The intensity and lifetime of such afterglow can be substantially enhanced in the case of Pr3+-Eu2+ co-doped, whose afterglow can last for approximately 300 min in the dark and the intensity is five times higher than the sample single doped with Eu2+. According to the thermoluminescence glow curves, the trap depth of these double-doped samples is about 0.95 eV, which is suitable for the generation of afterglow luminescence. And Pr3+ ions help to enhance the traps concentrations and modify the trap depth, which contributes to prolong the afterglow duration and increase the afterglow intensity of the phosphors. Finally, a feasible explanation of this afterglow generation is also discussed in this work.

Multicolored photoluminescence and structural properties of zirconium oxide films co-doped with Tb3+ and Eu3+ ions

The photoluminescence and structural properties of ZrO2 films doped with Eu3+ and Tb3+ ions, deposited by ultrasonic spray pyrolysis technique, are reported. X ray diffraction analysis showed that the films are polycrystalline and exhibit the ZrO2 tetragonal metastable phase. The surface morphology characteristics of the films are strongly dependent on the deposition temperature, going from a rough surface formed by ramifications at low temperatures to a denser material with ramifications and the appearance of spherical features at higher temperatures. In addition, the elemental composition of the films as determined by energy dispersive spectroscopy, is reported. The photoluminescence spectra present the characteristic emission peaks associated with the Tb3+ and Eu3+ dopants as well as a broad emission peaked at 440nm associated with radiative transitions within the ZrO2 matrix. As the deposition temperature is increased, it was observed an increasing intensity of the photoluminescence emission. Also a concentration quenching was observed for both dopants. The photoluminescence emission spectra for the ZrO2 films co-doped with Eu3+ and Tb3+ ions, showed emission lines that are a combination of those observed for each ion individually plus the blue broad band associated with the host lattice. Decay times were measured for double doped samples. The CIE chromaticity diagrams for these films showed colors falling in the blue, green, yellow, red-orange, bluish-white and yellowish-white regions depending on the doping characteristics of the films.

Effects of Al/Sb Double Doping on the Thermoelectric Properties of Mg2Si0.75Sn0.25

Al/Sb double-doped Mg2Si0.75Sn0.25 materials were prepared by liquid–solid reaction synthesis and the hot-pressing technique. The effects of Al/Sb double doping on the thermoelectric properties were investigated at temperatures between room temperature and 900 K, and the resistivity and Hall coefficient were investigated at 80 K to 900 K. Al/Sb double-doped samples were found to be n-type semiconductors in the investigated temperature range. The absolute Seebeck coefficient (α), resistivity (ρ), and thermal conductivity (κ) for Al/Sb double-doped samples at room temperature were in the ranges of 152.5 μV K−1 to 109.2 μV K−1, 2.92 × 10−5 Ω m to 1.29 × 10−5 Ω m, and 2.50 W K−1 m−1 to 2.86 W K−1 m−1, respectively. The absolute values of α increased with increasing temperature up to a maximum, and decreased thereafter. This could be attributed to mixed carrier conduction in the intrinsic region. κ decreased linearly with increasing temperature to a minimum near the intrinsic region, then increased rapidly because of bipolar components. The highest ZT value measured was 0.94 at 850 K for Mg1.9975Al0.0025Si0.75Sn0.2425Sb0.0075. Sb doping was effective for enhancement of ZT, because of a remarkable increase in the carrier concentration. However, Al doping was almost ineffective for enhancing ZT.

Rare earth doped hydrated and anhydrous zinc phosphate nanophosphors: A promising white light emitter

This study explores the viability of rare earth doped zinc phosphate nanophosphors as probable candidates for white light emission. Novel single, double and triple doped hydrated and anhydrous Zn3(PO4)2:RE (RE=Eu, Tb, Ce) nanophosphors have been synthesized through a simple sonochemical process and characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence (PL) spectrophotometry. The results of XRD and TEM show that resultant nanophosphors are single phase and rod shaped. The doped samples showed multi color emission on single wavelength excitation. The difference in emission characteristics between Zn3(PO4)2(H2O)4:Eu3+(5%) and Zn3(PO4)2:Eu3+(5%) have been discussed. Energy transfer was observed from Tb3+ to the Eu3+ dopant ions in the double doped samples obliterating the green emission from the Tb3+ dopant. However, the Ce3+ ions in the Eu3+ and Tb3+ double doped host yielded green emission which has been assigned to charge-transfer between the Ce3+ and Tb3+ ions. The CIE coordinates of the Zn3(PO4)2:Ce3+(2%):Tb3+(2.5%):Eu3+(0.5%) nanophosphor was found to be (0.35, 0.32), which lie in the white light region of the chromaticity diagram and its quantum efficiency was 47%.

Microstructures and Thermoelectric Properties of Sintered Ca3Co4O9-Based Oxide

Zn- and Ti-doped thermoelectric misfit cobalt oxides Ca3Co4−x−y Zn x Ti y O9 (x = 0 to 0.5, y = 0 to 0.5) were prepared by solid-phase reaction, followed by uniaxial compression molding and sintering at 1173 K for 20 h. Powder x-ray diffraction (XRD) data suggest that Zn and Ti dopants substitute in the rocksalt layer rather than in the CoO2 layer for x ≤ 0.1 and y ≤ 0.1, respectively. In Zn and Ti single-doped samples for x ≤ 0.1 and y ≤ 0.1, ZT at room temperature increased with x and y through an increase in the absolute Seebeck coefficient despite a decrease in electrical conductivity. In Zn and Ti double-doped samples, minor phases other than the misfit oxides were observed at approximately x + y ≥ 0.1. At x ≤ 0.1 and y ≤ 0.1, double doping improved the thermoelectric properties. ZT at room temperature reached a maximum value of 0.035 at (x, y) = (0.1, 0.03).

Thermoelectric Properties of p-Type Mg2.00Si0.25Sn0.75 with Li and Ag Double Doping

Mg2Si1−x Sn x -system solid solutions are ecofriendly semiconductors that are promising materials for thermoelectric generators in the middle temperature range. To produce a thermoelectric device, high-performance p- and n-type materials must be balanced. In this paper, p-type Mg2.00Si0.25Sn0.75 with Li and Ag double doping was prepared by the liquid–solid reaction method and hot-pressing. Effects of Li and Ag double doping on thermoelectric properties were investigated in the temperature range from room temperature to 850 K. All sintered compacts were identified as single-phase solid solutions with anti-fluorite structure. The carrier concentration increased with the double doping. The temperature dependence of resistivity of the double-doped samples was similar to that of a metal. The seebeck coefficient increased with temperature to a maximum value and then decreased in the intrinsic region. Thermal conductivity decreased linearly with increasing temperature, reaching a minimum near the intrinsic region, and then increased rapidly because of the contribution of the bipolar component. The dimensionless figure of merit reached 0.32 at 610 K for Mg2.00Si0.25Sn0.75 double-doped with Li-5000 ppm and Ag-20000 ppm.

Nd → Yb energy transfer in (Nd, Yb):Y 2O 3 transparent ceramics

In the attempt to obtain new efficient laser systems, the Nd → Yb energy transfer characteristics in Y 2O 3 transparent ceramics were investigated. The spectral characteristics that assure the efficient resonant Nd 3+ → Yb 3+ energy transfer are presented, especially the overlap integral of the Nd 3+ 4F 3/2 → 4I 9/2 emission with the Yb 3+ 2F 7/2 → 2F 5/2 absorption in (Nd, Yb):Y 2O 3. The static spectral data reveal that the Nd 3+ → Yb 3+ energy transfer shows: a strong dependence on Yb 3+ content (less on Nd 3+), a small variation with temperature and the implication of both Yb 3+ sites in transfer, though only Nd 3+ in C 2 are active. From the analysis of Nd 3+ 4F 3/2 emission decays in double doped samples it is concluded that the Nd → Yb transfer for Nd ∼1 at.% is of direct type, through the dipole–dipole interaction with global energy transfer microparameter ∼ C DA,Nd – Yb ≈ 1 × 10 −38 cm 6 s −1 and transfer efficiencies up to 98% for rather low (∼5 at.%) Yb 3+ content.

Effect of doping on the morphology and multiferroic properties of BiFeO3 nanorods

In this study we report the synthesis of BiFeO(3) nanorods using a sonochemical technique. The nanorods had a diameter of 20-50 nm, a length of 100-500 nm and exhibit aspect ratios in the range of 5-10. However, after doping, the TEM images of Bi(0.9)Ba(0.1)Fe(0.9)Mn(0.1)O(3) and Bi(0.9)Ca(0.1)Fe(0.9)Cr(0.1)O(3) samples show that the aspect ratios of both the double doped samples have reduced considerably, while retaining the crystallinity of the particles. BiFeO(3) nanorods show a weak ferromagnetic order at room temperature, which is quite different from the linear M-H relationship reported for bulk BiFeO(3). The saturation magnetization of these BiFeO(3) nanostructures has been found to increase on doping with various metal ions (Ba(2+), Ca(2+), Mn(2+), Cr(3+)), reaching a maximum value of 1.35 emu g(-1) for the Bi(0.9)Ba(0.1)Fe(0.9)Mn(0.1)O(3) nanostructures. However, saturation of electric polarization was observed only in case of the Bi(0.9)Ca(0.1)Fe(0.9)Cr(0.1)O(3) nanostructures.

Thermoelectric Performance of p-Type Mg<SUB>2</SUB>Si<SUB>0.25</SUB>Sn<SUB>0.75</SUB> with Li and Ag Double Doping

The single-phase of p-type Mg2Si0.25Sn0.75 with Li and Ag double doping were prepared by the liquid-solid reaction and hot-pressing methods. All samples thus obtained were identified by XRD as single-phase solid solutions with an anti-fluorite structure. The effects of Li and Ag double doping on thermoelectric performance were investigated at temperature differences (ΔT) of 0 to 500 K. The thermoelectromotive force (E) of the Li-25000 ppm single-doped sample was determined to be 88 mV at ΔT=500 K. For the Li-20000 ppm and Ag-5000 ppm double-doped sample, the E value became larger (92 mV) after Ag substitution. A maximum E value of 97 mV was obtained for the Ag-25000 ppm single-doped sample and the Li-5000 ppm and Ag-20000 ppm double-doped sample. Mean resistivity (rm) at ΔT=500 K decreased by double doping and showed a minimum value of 2.94×10−5 Ωm for the Li-5000 ppm and Ag-20000 ppm double-doped sample. The maximum effective power (P=E2⁄4rm) increased with ΔT. The P values of single-doped samples at ΔT=500 K were 38 Wm−1 for Li single-doped and 72 Wm−1 for Ag single-doped samples. P for the Li-20000 ppm and Ag-5000 ppm double-doped sample was 64 Wm−1, which was an improvement of about 90% compared with the Li single-doped sample. The maximum value of P at ΔT=500 K was 80 Wm−1 for the Li-5000 ppm and Ag-20000 ppm double-doped sample, which was an improvement of about 10% compared with the Ag single-doped sample.

Incorporation of double artificial pinning centers in YBa 2Cu 3O 7−δ films

YBa 2Cu 3O 7−x + BaZrO 3 + Y 2O 3 (YBCO + BaZrO 3 + Y 2O 3) mixed films were prepared on SrTiO 3/MgO substrates by pulsed-laser deposition from an YBCO + BaZrO 3 target with a thin Y 2O 3 sector stuck on the top. The pinning properties for the double-doped YBCO + BaZrO 3 + Y 2O 3 thin film were enhanced in comparison with a pure YBCO sample prepared in the same experimental conditions. The maximum global pinning forces F P for the double-doped sample are 12.8 GN/m 3 at 77K, 46.3 GN/m 3 at 65K, and 122 GN/m 3 at 40K. In the double-doped sample, the angular dependence of J c showed a broad peak at B//c due to the flux pinning by c-axis correlated defects, combined with a plateau, due to the flux pinning by isotropic pinning centres. Consistently, both BaZrO 3 nanorods parallel to the c-axis and Y 2O 3 nanoparticles randomly dispersed inside the YBCO matrix were observed in TEM images.

Effect of Doping on Thermoelectric Properties of Delafossite-Type Oxide CuCrO2

We have studied the effects of doping on the high-temperature thermoelectric properties of the delafossite-type oxide CuCrO2. The single or double doping of divalent cations for Cr3+ ions was carried out to introduce hole carriers. For the first step, we measured the electrical conductivity σ and Seebeck coefficient S of single-doped samples, and calculated the power factor P=σS2. Mg-, Zn-, Ca-, Ni-, and Co-doped samples showed a higher power factor than CuCrO2, while the Fe-, V-, and Mn-doped samples exhibited a lower power factor. The maximum power factor P=2.36×10-4 W/mK2 at 1100 K was obtained with the Mg-doped sample. The above tendencies of the power factor are well explained by the valence states and ionic radii of the dopants. For the next step, Mg and M (M = Zn, Ca, Ni, or Co) double-doped samples were prepared. Since there was no impurity phase in the Mg+Ni cases, we have elucidated the structure and high-temperature thermoelectric properties of CuCr0.97-xMg0.03NixO2 (0<x≤0.05). The lattice parameter a decreases with increasing x, which is responsible for the increase in the degree of overlap of Cu 3d orbitals. Since the Cu–O bond distance of the double-doped samples is shorter than that of the Mg-doped sample, it was found that hole carriers are introduced into the Cu site by the double doping. The shorter Cu–O bond distance also results in the increase in the overlapping integral between Cu 3d and O 2p orbitals. Because of the increase in the overlapping integral between the electronic orbitals caused by the topological reason and the increase in the number of hole carriers in the Cu site, the double-doped samples exhibited a higher electrical conductivity than the Mg-doped sample. The maximum electrical conductivity 45 S/cm around 1000 K was obtained for the sample of x=0.04. The Seebeck coefficient of the double-doped samples was higher than that of the Mg-doped sample, in which the total number of hole carriers (i.e., the sum of the hole carriers in the Cu and Cr sites) is decreasing. The Seebeck coefficient of the double-doped samples was higher than 225 µV/K from 300 to 1100 K. The thermal conductivity of the double-doped samples (κ>6 W/mK) was higher than that of the Mg-doped sample. As a result, the maximum dimensionless figure of merit ZT=σS2T/κ=0.10 was realized with the sample of x=0.04 at 1100 K, which was twice as high as that of the Mg-doped sample.

Incorporation of double artificial pinning centers inYBa2Cu3O7−d films

YBa2Cu3O7−x+BaZrO3+Y2O3 (YBCO+BaZrO3+Y2O3) mixed filmswere prepared on SrTiO3/MgO substrates by pulsed-laser deposition, with anYBCO+BaZrO3 targetwith a thin Y2O3 sector stuck on the top. The pinning properties for the double-dopedYBCO+BaZrO3+Y2O3 thin film were enhanced in comparison with those of a pure YBCO sample preparedin the same experimental conditions. The maximum global pinning forcesFp for the double-dopedsample are 12.8 GN m−3 near3 T at 77 K, 46.3 GN m−3 near4 T at 65 K, and 122 GN m−3 near 9 T at 40 K. In the double-doped sample the angular dependence ofJc showed a broad peak at , due to the flux pinning by c-axis correlated defects, combined with a plateau, due to the flux pinning by isotropic pinning centers. BothBaZrO3 nanorodsparallel to the c-axis and Y2O3 nanoparticles randomly dispersed inside the YBCO matrix were consistently observed inthe cross sectional transmission electron microscopy images.