Optimal Doping Concentration Research Articles

Improvement of luminescent properties of GdPO4 doped with optimal europium concentration by Co-doping with lanthanum

Hexagonal gadolinium Phosphate Hydrate doped with different europium amounts (Gd1-xPO4:Eux·H2O; x = 0.01, 0.05, 0.10, 0.15, and 0.20) was synthesized by hydrothermal synthesis method and the obtained samples were analyzed giving the optimal dopant concentration. Furthermore, gadolinium was additionally replaced by Lanthanum Gd0.85-yLayPO4:15%Eu (y = 0.25, 0.5, 0.75) in hopes of improving luminescence properties even more. This may be possible due to the fact that LaPO4 exhibits a monoclinic crystal structure, which usually shows better luminescence properties. All of the synthesized compounds were analyzed by X-ray diffraction in order to investigate their crystal structure. SEM analysis was used to characterize the morphology of synthesized particles, while surface area and the pore size of Gd0.85-xLaxPO4:15%Eu samples were measured using Nitrogen adsorption by the BET method and BJH method. The luminescence properties were also characterized and discussed in detail. Lastly, the cytotoxicity study demonstrated that the replacement of gadolinium with lanthanum leads to a reduction in the toxicity of the samples.

Phase recognition and spectroscopic characteristics of single-phase Tb3+ doped Gd4Al2O9 nanophosphors for NUV energized advanced photonic appliances

Self-propagating solution combustion (SC) synthetic method has been used to prepare single-phase Gd4-xAl2O9:xTb3+ (x = 1–6 mol%) powdered samples. Various structural, morphological and optical studies are performed in order to characterize the designated nanocrystalline materials. Phase recognition and refinement parameters of doped phosphors are explored via X-ray diffraction (XRD) assisted Rietveld refinement technique which authenticates that powdered samples are crystallized into monoclinic crystal system having P21c space group. Williamson-Hall (W–H) linearly fitted method along with Scherrer's formula is employed to calculate the average crystallite size of doped materials which are found to be in the domain of nano-range. Transmission electron microscopy (TEM) reveals the presence of non-uniform agglomerated particles with characteristics porosity. The emission profile of all doped samples possesses sharp emission lines centred at 416, 438, 460, 486, 543, 591 and 621 nm due to 5D3 → 7F5, 5D3 → 7F4, 5D3 → 7F3, 5D4 → 7F6, 5D4 → 7F5, 5D4 → 7F4, and 5D4 →7F3 intra-configurational transitions of Tb3+ ion, respectively. The optimized doping concentration of Tb3+ ion for Gd4Al2O9 host is found to be 4 mol%. The resulting chromaticity coordinates (x, y) and high correlated color temperature (CCT) values of doped phosphors endorsed their usage in near ultra-violet NUV energized solid-state display appliances.

Enhanced upconversion emission in Er3+/Yb3+-codoped Al2Mo3O12 microparticles via doping strategy: Towards multimode visual optical thermometer

To explore highly sensitive luminescent materials, a series of Er3+/Yb3+-codoped Al2Mo3O12 microparticles were prepared through a high-temperature solid-state reaction method. The phase structure, light harvest ability, morphology, and upconversion (UC) emission characteristics of these synthesized microparticles were investigated systematically. Excited at 980 nm, glaring visible UC emissions are gained in the developed specimens, in which the optimal doping content for Yb3+ is 7 mol% and the two-photon absorption process contributes to the UC emission mechanism. Based on the fluorescence intensity ratio technology, the thermometric properties of resultant microparticles are studied by analyzing the temperature-dependent green UC emissions of Er3+ arising from the thermal coupling energy levels. The maximum absolute and relative sensitivities of final products are 0.011 K-1 and 1.09% K−1, respectively, and they are barely influenced by Yb3+ contents. Besides, via exploring the lifetimes of 2H11/2 and 4S3/2 levels of Er3+ at various temperatures, the relative sensitivities of resultant microparticles are determined to be 0.27% and 0.26% K−1, respectively. Furthermore, the newly developed microparticles can be adopted to fabricate fluorescent ink to realize optical anti-counterfeiting and visual temperature monitoring. Our studies demonstrate that Er3+/Yb3+-codoped Al2Mo3O12 microparticles with strong UC emissions possess great potential for multimode visual optical thermometry applications.

An anti-counterfeiting strategy of polydimethylsiloxane flexible light-emitting films based on non-rare-earth Mn4+-activated Ba2LaTaO6 phosphors

Luminescent materials have been widely utilized for anti-counterfeiting applications due to their good feasibility for tunable optical properties. Herein, an anti-counterfeiting strategy based on polydimethylsiloxane (PDMS) flexible light-emitting films is reported. At first, tetravalent manganese (Mn4+)-activated Ba2LaTaO6 phosphors were synthesized by a high-temperature solid-state reaction. The optimal doping concentration of Mn4+ was estimated to be about 0.3 mol% while the quantum yield and color purity were found to be as high as 30.74% and 96.67%, respectively. Afterward, the thermal stability was analyzed based on the temperature-dependent photoluminescence emission spectra and decay curves. Eventually, the optimal sample-convert PDMS flexible films with the ease of operation and good reusability were fabricated and their security level was further boosted by the cooperation of multi-colored and special characters. It is believed that this work can offer valuable information for the construction of a high-level security anti-counterfeiting strategy.

Thermal Degradation of Hybridize Doped Poly(Dioctylfluorene) Film with Polydimethylsiloxane

The purpose of this study is to evaluate the thermal degradation of hybridize doped poly(dioctylfluorene) (PF8) film with polydimethylsiloxane (PDMS). The hybridized PF8/PDMS films were produced using solvent casting technique. The poly(dioctylfluorene) was dissolved using chloroform and subsequently polydimethylsiloxane was added prior mixing. Three different concentrations of PF8 were used to prepare the doped film. After casting, the samples were put in an oven at 100°C for 5 minutes for curing process. Later the thermal degradation test was conducted on the prepared sample for the duration of 1 hour, 2 hours, 3 hours and 24 hours to observe the effect of temperature on the photoluminescence properties of PF8. UV-visible spectroscopy was mainly used to measure the absorption intensity of the hybridized materials. It was configured that the optimum doped concentration for PF8 with PDMS is by using 5.0×10-3 mol of PF8. This is due to a good solubility of PF8 and easy to be casted.

Effects of various metal doping on the structure and catalytic activity of CoB catalyst in hydrogen production from NaBH4 hydrolysis

Four ternary alloy CoB-based catalysts, including Co-Sn-B, Co-Mn-B, Co-Cr-B and Co-Bi-B, were prepared by chemical reduction method.The effect of Sn, Mn, Cr and Bi dopants on phase structure, surface morphologies, electronic interaction, catalytic activity and activation energies of CoB catalysts investigated in depth. Their catalytic activity in hydrogen production from NaBH4 hydrolysis was compared systematically. Compared with undoped CoB catalyst, it can be found that the doping of Cr and Bi exhibits a significant promoting effect on CoB catalyst by accelerating hydrogen generation rate. Nevertheless, the introduction of Sn and Mn into CoB catalyst only attains a slight increase in hydrogen production rate. The doping concentration of Sn, Mn, Cr, Bi species in CoB was adjusted to respectively check their phase structure and catalytic performance, indicating that there is an optimum doping concentration for each dopant. It can be concluded that the promoting effect of various dopants on catalytic performance can be attributed to crystalline phase, specific surface area and electronic interaction involved in NaBH4 hydrolysis.

LiI doping of mixed-cation mixed-halide perovskite solar cells: Defect passivation, controlled crystallization and transient ionic response

We investigate lithium iodide (LiI) doping of mixed-cation mixed-halide (MCMH) perovskites as a method to improve film morphology and optoelectronic properties, reduce defect-related recombination losses and limit ion migration. The optimized Li-doped devices achieved 21.5% power conversion efficiency (PCE) compared to 20.4% for undoped control devices. Furthermore, optimized Li-doped devices show minimized current-voltage hysteresis across a wide range of scan rates compared to control devices, which displayed significant scan-rate dependent hysteresis. We show, using a combination of experimental analysis and numerical device simulations, that the improved device performance and transient response at optimum doping concentration are consistent with reduced non-radiative recombination in the perovskite. However, increasing the LiI dopants beyond the optimum concentration alters the ionic properties of the perovskite absorber and changes the transient response. We also find that LiI addition results in a downward shift of the valence band and a corresponding transition from a weakly n-type to p-type perovskite material. These findings reveal the beneficial role of LiI dopant at low concentrations can improve shelf-life and minimize recombination-active defects, which are favourable for designing high-performance and stable mixed-cation mixed-halide perovskite devices.

Thermometric sensing performance in Erbium modified SrBi2-xNb2ErxO9 ferroelectric ceramic for optoelectronic devices

Er3+ doped ferroelectric ceramic compositions SrBi2-xNb2ErxO9 (x = 0–5 mol %) are prepared by solid-state reaction method and sintered at 1000 °C. The ceramic's structural, ferroelectric, optical, and thermometric sensor properties have been studied. The XRD analysis confirmed the orthorhombic geometry and the A21am phase group of the ceramic. The FTIR studies revealed the typical modes (602 cm−1 and 802 cm−1) of the Aurivillius phases of bismuth layered structure ferroelectrics (BLSFs). The improved hysteresis loops are traced under the electric field < ± 50 kV/cm, and P-E parameters seem to be affected by the insertion of the Er3+ dopant. In upconversion luminescence (UCL) spectra, two intense green bands at 529 nm and 549 nm and a diminished red peak at 670 nm have been identified, corresponding to a 980 nm exciting wavelength. The increase in the lifetime with changing erbium content indicates the efficient energy transfer in Er3+ ions, which results in non-radiative transition at a higher doping level. The optimum dopant concentration is x = 0.03 and is used to measure the pump power dependence on the UCL emission intensity. This study suggests that the two photons are involved in green and red UC emissions. The maximum sensitivity achieved in SrBi2-xNb2ErxO9 ceramic at x = 0.03 is 0.0086 K−1 at 443 K, ranging between temperatures 303 K–443 K, making it a promising non-contact sensor material.

Deep-red emission in Mn4+ activated CaMgAl10O17 phosphor and enhanced optical photoluminescence by charge compensator of Mg2+

In this work, we synthesized a series of CaMgAl10O17:Mn4+, CaMgAl10O17:Mn4+, Mg2+ phosphor by sol-gel method and investigated their phase constituents, microstructure and photoluminescence properties in detail by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), excitation and emission spectra (PLE & PL) and fluorescent lifetime measurements. Under 397 nm excitation, these doped Mn4+ phosphors exhibit intense deep-red emission at 655 nm, belonging to the 2Eg→4A2g transition of Mn4+. The optimal doping concentration of Mn4+ ions reached about 0.02, and co-doping Mg2+ could obviously improve the luminous performance and thermal stability. When the co-doping concentration of Mg2+ ions was about 0.04, the maximum emission intensity could be enhanced by 60%, and color purity is 94%. Lifetime of CaMgAl10O17:0.02Mn4+, 0.04Mg2+ phosphor is 1.052 ms. These results suggest that CaMgAl10O17:Mn4+, Mg2+ has promising application for indoor plant cultivation.

Cost effective synthesis of CuxBi2-xSe3 photocatalysts by sol-gel method and their enhanced photodegradation and antibacterial activities

A simple sol-gel approach was used to synthesize Cu doped Bismuth Selenide nanoparticles denoted as CuxBi2-xSe3 (x = 0.1, 0.2), in order to comprehend the effect of Cu-dopant on the photocatalytic and antibacterial activity of Bismuth Selenide. The structural properties of prepared samples were investigated by the XRD technique and results showed the formation of hexagonal CuxBi2-xSe3 (x = 0.1, 0.2). The average crystallite size of CuxBi2-xSe3 was found to increase from 39 nm to 42 nm with the increase in the concentration of Cu ions. Atomic force microscopy (AFM) was used to confirm the morphology and particle size of prepared samples. Photoluminescence (PL) studies revealed the decrease in band gap from 1.66 eV to 1.61 eV for Cu0.1Bi1.9Se3 and Cu0.2Bi1.8Se3, respectively. The Raman spectra of CuxBi2-xSe3 (x = 0.1, 0.2) showed two vibrational modes at 130 cm−1 and 170 cm−1. The photocatalytic performance of prepared nanoparticles was evaluated by the removal of methyl blue (MB) and malachite green (MG), under natural sunlight. Cu doped Bismuth Selenide Cu0.2Bi1.8Se3 exhibited higher photocatalytic activity as compared to Cu0.1Bi1.9Se3 and undoped Bismuth Selenide with the 97% and 99% degradation of MB and MG, respectively. Hence, Cu doping proved an efficient way to enhance the photocatalytic response of Bismuth Selenide. Through the antibacterial activity, it was further disclosed that the Cu doped samples had better inhibition zones than undoped Bismuth Selenide. The maximum inhibition zone (29 mm) was observed at optimum doping concentration for Cu0.2Bi1.8Se3. From the results, it can be deduced that Cu0.2Bi1.8Se3 can be as effective photocatalytic and antibacterial agent to treat water pollution.

New developments in the Gd3+/Sm3+ ions doped lithium aluminum borate glasses of luminescent materials for lighting applications

The standard melt-quenching technique was used to create a novel series of Gd3+ and Sm3+co-doped borate glasses with the LAGdxBSm1.0 and LAGd2.5BSmx series of glasses. All samples were analyzed by XRD, FTIR, and optical screening to determine their characteristics (absorption, excitation, and emission). The results confirmed the amorphous nature of the synthesized glass samples, while the FTIR revealed the existence of BO3, and BO4 vibrations in the samples. The series glass quality of LAGdxBSm1.0 doped in the host matrix was confirmed by the radioluminescence and photoluminescence results at the optimal doping concentration of 2.5 mol%. The decay of samples was investigated to determine the relationship between doping concentration and luminescence characteristics. Glasses have been created into an appropriate lighting glass using 25Li2O-5Al2O3-2.5Gd2O3-(67.5-X)B2O3-XSm2O3 host matrix glass doped with varying concentrations of Sm3+. Visible light and near-infrared absorption values in the glass samples demonstrate the existence of Sm3+ions. The photoluminescence and radioluminescence spectra have high concentration quenching (0.5 mol%) and produce four emission peak wavelengths, with the maximum emission wavelength at 600 nm (soft orange color). Based on these results, the studied glass series could be a good choice for X-ray scintillators in medical, industrial, and other settings in the future.

Study on luminescent properties of orange phosphor NaCaPO4 :Eu3.

The NaCaPO4 :Eu3+ phosphor was synthesized by the sol-gel method. The structure and luminescence properties of the phosphor were analyzed by thermogravimetric-differential thermal analysis (TG-DTA), Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM) and fluorescence spectroscopy. TG-DTA results show that NaCaPO4 phase can be formed after 700°C. FTIR spectra confirmed the existence of PO4 units. XRD results show that the sample is a pure NaCaPO4 orthorhombic crystal phase. The TEM diagram shows that the sample has good uniformity. The NaCaPO4 :Eu3+ emits orange light under 394 nm excitation. The optimal doping concentration is 3mol%. The reason for concentration quenching is caused by multipolar interaction. Through further analysis of the charge transfer band and the spectrum at 5 D0 → 7 F0 transition of the NaCaPO4 :Eu3+ phosphor, the reason for the orange light of the phosphor is owing to the different Eu3+ occupancy which is explained in detail.

Improvement of epitaxial growth and flux pinning of MOD-derived YBa2Cu3O7−δ nanocomposites films by self-seeding and multi-element doping strategies

YBa2Cu3O7−δ (YBCO) nanocomposite films were fabricated by low-fluorine metal-organic deposition (LF-MOD) route, combining self-seeding and multi-doping strategies with elements of Zr, Hf, Sn and Mn. Under the same growth conditions, due to the self-seeding layer as a template for the c-axis growth of doped films, all the multi-doped films with 200 nm self-seeding layers exhibit good c-axis orientation, even for the heavy doping of 16 mol%. EDS confirmed the four doping elements in the multi-doped YBCO films appear independently, leading to higher density of nano-scale heterogeneous phases than the case of Zr single doping. The pinning force density (Fp) and critical current density (Jc) are improved significantly, which indicates that the optimal doping content is achievable as high as 12 mol% in the case of multi-doping. The multi-12% YBCO films have the highest Fp,max of 6.13 GN/m3 at 77 K, which is about 3.3 times higher than that of the undoped films, and the Jc can reach 4.3 MA/cm2 at 30 K, compared to 3.1 MA/cm2 for the undoped films.

Eu3+ doped K2O-B2O3-Al2O3-SiO2 glass ceramics containing KAlSiO4 crystalline phase: Realizing red emission and high thermal stability

Eu3+ doped K2O-B2O3-Al2O3-SiO2 glass ceramics containing KAlSiO4 crystallite were synthesized by melt crystallization method. Differential scanning calorimetry (DSC) analysis, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to identify the optimal heat treatment conditions for glass ceramics, which were 560 °C/90 min. The light transmittance of the glass ceramics can reach up to 75% in the visible light range. The luminescence properties of glass ceramics were studied by fluorescence spectra, and the optimal doping concentration of Eu3+ was determined to be 0.7%. At this concentration, the fluorescence lifetime is 1.65 ms, the chromaticity coordinate (CIE) is (0.583, 0.4048). The luminescent properties of glass ceramics have high stability under the change of temperature (300–460 K). Eu3+ doped K2O-B2O3-Al2O3-SiO2 based glass ceramics have potential applications in solid-state lighting, red lasers.

A high-k Cu-doped ZnO film formed via Ga-ion implantation: The acceptor-donor co-doping approach

Dielectric thin films having high permittivity (high-k) and low dielectric loss is essential for developing high performance capacitive devices like metal oxide field effect transistor or thin film transistor. Ga ion implantation performed on Cu-doped ZnO film fabricated by pulsed laser deposition with optimized doping concentrations and post-implantation annealing yielded film having high permittivity and low dielectric loss (ε = 87 and tan δ = 0.17 at the frequency of 1 kHz). Moreover, the permittivity exhibits good stability over a wide range of frequency from 20 Hz to 10 MHz. The high-k film was characterized by detailed dielectric studies, including frequency dependence of permittivity and dielectric loss, complex electrical modulus analysis, impedance spectroscopy and ac conductivity. The enhancement of the permittivity was attributed to the correlated potential barrier hopping of electrons between the neighboring acceptor-donor defect complex states in the band gap created by the co-doping, thus acting as electric dipoles polarizing the film. This work opens up future possibility for ‘dielectric engineering’. The three-dimensional dielectric spatial profile can be controlled via the selective area ion implantation with the depth controlled by the ion implantation energy. • A high-k Ga-Cu co-doped ZnO film formed via pulsed laser deposition and ion implantation method. • Optimized doping concentrations yielded high permittivity and low dielectric loss (ε=87 and tan δ=0.17 at 1 kHz). • Enhancement of permittivity was attributed to the correlated barrier hopping of electrons between neighboring defect complex.

Microstructure and photoluminescence of Eu-doped Sr3Al2O6 phosphors calcined with and without H3BO3 flux

The development of highly efficient and stable red phosphors fabricated using cost-effective and simple mass-production methods is essential for applications in future displays and lighting devices. Herein, we investigate the phase formation, microstructures, and luminescence properties of Sr3Al2O6:Eu powders synthesized using a solid-state reaction process. Single-phase Sr3Al2O6:Eu phosphors exhibiting excellent photoluminescence with color-tunable orange-red and red colors under different excitation wavelengths were successfully synthesized. The optimal Eu doping concentration of Sr3Al2O6, yielding strong photoluminescence with phase stability, was 5 at. %, with the concentration quenching point determined by systematic exploration. The addition of H3BO3 as a flux significantly affected the grain size and improved the emission intensity of the synthesized (Sr0.95Eu0.05)3Al2O6 phosphors up to 12.5 wt %, while secondary phases were formed at higher flux concentrations. The photoluminescence intensities of the 5D0 → 7F1 and 5D0 → 7F2 transitions of 12.5 wt % H3BO3 added (Sr0.95Eu0.05)3Al2O6 increased by 3.4 and 4.2 times compared with the flux-free powders under the 394 nm-wavelength excitation, while the decay time decreased from 7.35 to 5.40 ms. Our report of the enhanced photoluminescence intensity and shortened decay time of (Sr0.95Eu0.05)3Al2O6 phosphors following the flux addition is promising for production of single-phase phosphors emitting multi-colors, which is needed for optical devices activated by various excitation frequencies.

On the structures and luminescence properties of Eu3+ -doped Li2 CaGeO4 , Ca2 GeO4 , and Ca5 Ge3 O11 compounds.

Powder samples of Li2 CaGeO4 , Ca2 GeO4 , and Ca5 Ge3 O11 doped by 0.5, 1, 2, 3, 4 and 5 at% Eu3+ relative to the Ca2+ , were prepared using a conventional solid-state synthesis technique. X-ray diffraction (XRD) analyses confirmed obtaining the pure phases at all dopant concentrations. In parallel, single crystals of the three compounds with the experimentally found optimal Eu3+ concentration were grown using a flux method. Structural investigation on the single crystals were done with a special attention to the form of the Ca-O polyhedron, the mean Ca-O distance, the Ca-Ca distance in the structure, the distortion degree of the polyhedron, as well as the Eu-Ca substitution site. The main spectral characteristics were analyzed and several relationships between the structural and spectra features were found. The optimal dopant concentration was 3 at% for Ca2 GeO4 and 4at% for Ca5 Ge3 O11 and Li2 CaGeO4 . Commission Internationale de l'éclairage coordinates of the samples showed emission colours in the red region close to the standard red coordinates and slightly influenced by the active ion concentration. The obtained results showed that europium-doped Li2 CaGeO4 , Ca2 GeO4 , and Ca5 Ge3 O11 could be used as red phosphors.

Synthesis and H2S-Sensing Properties of MOF-Derived Cu-Doped ZnO Nanocages.

Metal–organic framework (MOF)-derived pure ZnO and Cu-doped ZnO nanocages were fabricated by calcining a zeolitic imidazole framework (ZIF-8) and Cu-doped ZIF-8. The morphology and crystal structure of the samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). It was found that Cu doping did not change the crystal structures and morphologies of MOF-derived ZnO nanocages. The H2S-sensing properties of the sensors based on ZnO and Cu-doped ZnO nanocages were investigated. The results indicated that the H2S-sensing properties of MOF-derived ZnO nanocages were effectively improved by Cu doping, and the optimal doping content was 3 at%. Moreover, 3 at% Cu-doped ZnO nanocages showed the highest response of 4733 for 5 ppm H2S at 200 °C, and the detection limit could be as low as 20 ppb. The gas-sensing mechanism was also discussed.

Blue-light excitable red-emitting Eu3+-doped TiO2 phosphor for WLED applications: Judd-Ofelt analysis and systematic investigation on its optical properties

Red-emitting Eu3+-activated TiO2 phosphors with excellent color purity of 99.9% have been successfully synthesized by a facile sol-gel method. PLE spectrum demonstrates that the obtained products have absorption bands ranging from 370 to 540 nm, with the highest band peaking at 464 nm. Under the blue excitation of 464 nm, the characteristic emissions of Eu3+ ions corresponding to the 5D0 → 7FJ transitions are observed, with the dominant emission peak at 614 nm. The optimal annealing temperature and dopant concentration are 5 h at 500 °C and 1.3 mol%, respectively. The PL quenching mechanism is attributed to the dipole-quadrupole interaction. The Judd-Ofelt analysis is carried out to explore the local structure environment around the Eu3+ ions. It is found that the highest asymmetry of the local environment surrounding Eu3+ ions and the strongest covalence Eu-O bond is attained at the annealing temperature of 500 °C and the activation energy is determined to be 0.385 eV. The fluorescence lifetime of the 614 nm emission was found to be 0.44 ms. These results indicate that the Eu3+-doped TiO2 phosphor may be a promising red-emitting phosphor for white light-emitting diodes.

Effects of temperature on the electrical properties of samaria-doped ceria predicted with the statistical moment method

Samaria-doped ceria (SDC) is an important candidate electrolyte for use in solid oxide fuel cells, but the effect of lattice thermal vibrations on its electrical properties are unclear. In this study, the statistical moment method was employed to predict the temperature dependences of vacancy–dopant association, migration and activation energies, and ionic conductivity in four theoretical regimes comprising static, harmonic, semi-classical anharmonic, and quantum anharmonic regimes. The lattice thermal vibrations weakened vacancy–dopant associations and significantly inhibited vacancy hopping, and these effects were more pronounced as the temperature increased. The strongest vacancy–dopant associations and less convenient movement of oxygen vacancies could occur in the crystal lattice including anharmonic vibrations. Considerable enhancement of the ionic conductivity and a shift in the optimal dopant concentration toward higher values were found in the harmonic regime. Increasing the temperature also led to similar changes in the ionic conductivity. The maximum ion conductivity was governed by trapping and blocking effects, but also by lattice thermal vibrations. The results indicated the trivial influence of quantum effects in the anharmonic vibrations on the electrical properties. These findings provide a deeper understanding of the underlying atomistic mechanisms that determine the effects of temperature and lattice thermal vibrations on the electrical properties, and they may be beneficial for optimizing the ionic conductivity of SDC electrolytes.