Shift Of Absorption Edge Research Articles

The effect of the thickness on structural, optical limiting, and dielectric properties of hybrid coatings rhodamine B dye films on an epoxy polymeric substrate for display applications

Various thickness of Rhodamine B (RhB) laser dye was deposited on epoxy polymeric as a new dielectric organic substrate by spin coating method for the first time. This study focused on the newly considered RhB dye on an epoxy substrate for wide-scale applications. The thickness effect on structural, optical, and dielectric properties of the hybrid coating films was performed. The XRD patterns of the films indicated a large hump amorphous design and lack of Bragg peak intensity associated with the RhB laser dye, due to amorphous film concentration. From UV-Visible spectroscopy, the optical absorption edge shifts to the higher wavelengths direction (redshift) with the variation in RhB dye thicknesses. It was found that the energy band gap decreased when the RhB dye film thickness changed. The refractive index is an important parameter influencing the optical component design. Their values vary according to each relationship that extremely useful the films in optical devices. Laser power attenuation sensitivity of pure epoxy polymeric substrate and its coating films shows that under reducing the thicknesses of RhB dye, the laser power intensity effect increases. Several dielectric parameters are extracted from the series and parallel capacitance measurements. The present results offer new material films for luminescent energy solar concentrator applications.

Application of the optical spectroscopy and X-ray diffraction methods for determining the effect of irradiation of the LR-115 type 2 track detector

The aim of this work is to evaluate the application of optical spectroscopy and X-ray diffraction methods as alternative methods for determining the dose dependence of the irradiation of solid-state nuclear track detectors (SSNTD) based on polymer films of nitrocellulose when irradiated with He particles. The choice of this type of film detectors as an object of research was due to its wide application for the detection of ionizing radiation during radionuclide decay. According to the data obtained, using optical analysis methods, it was found that an increase in exposure time leads to an increase in the transmission value and a shift in the fundamental absorption edge, which indicates the occurrence of changes in optical density in the material during accumulation of defects arising from the formation of latent tracks. The obtained data of structural changes using X-ray diffraction, showed that at small periods of exposure to ionizing radiation, the change of structural parameters is more severe than the change of optical characteristics. This is due to the fact that in the case of formation of single isolated tracks, the change in electron density along the trajectory of the ions is isolated and has a local character, while the change in structural characteristics, including the deformation is more pronounced. Such difference is also related to different mechanisms of energy losses of incident particles contributing to the change of structural and optical properties. Changing of optical properties is connected with electron losses of incident particles because the electron density changes as a result of particle passing along its trajectory, and this effect in case of single tracks is isolated and has a local character in a very small region. At the same time, the change of structural characteristics, in particular, deformations and displacements occur as a result of both elastic and non-elastic interactions of interacting particles with materials.

Structural and Optical Studies of Lithium Doped Barium Titanate

This study's goals are to fabricate and analyze the microstructure and optical properties of BT and Li-doped BT as the dependence of the Li concentrations (x) of 0.05, 0.1, and 0.15. The thin films of the BT and Li-doped BT have been successfully deposited on the quartz substrates by the sol-gel method. The microstructure and optical features were characterized via XRD and UV-Vis Spectrophotometer, respectively. The XRD patterns exhibit that the lattice parameter and cell volume of the Li-doped films are bigger than that of the BT due to the existence of Li doping in the BT host structure. Additionally, the tetragonality and crystallite size of all films decrease as the more Li number with the BLTO5 has the biggest lattice strain as compared to the others. Meanwhile, the optical characterization reveals that the transmittance spectra increase and the absorption edges shift to the shorter wavelengths as the addition of Li dopant indicating the bandgap values change. In contrast, the refractive index values of the films reduce by the more Li number.

The structural and optical properties of Ag/Cu co-doped BiVO4 material: A density functional study

Density Functional Theory (DFT) calculation was used to conduct a systematic theoretical study on the structural, electrical, and optical properties of pure, Ag-doped, Cu-doped, and (Ag, Cu) co-doped BiVO4. The simulated electronic structure showed that the synergistic effect of Ag/Cu co-doping can induce new energy states due to hybridization in the forbidden gap that resulted in decrease in the band gap of BiVO4, which indicates a decline in photogenerated electron-hole pair recombination and an understandable shift of absorption edge towards higher wavelength region. The (Ag, Cu) co-doped BiVO4 has a higher optical absorption intensity than pure Ag or Cu doped BiVO4, demonstrating the synergistic effect of Ag 4d and Cu 3d states. Furthermore, DFT calculations have been analyzed to explore the collective effect of Ag or/and Cu doping and the intrinsic oxygen vacancy defects in BiVO4.

Forming of CdZnTe thin films grown by hot wall epitaxy and their properties

In this work morphological, X-ray structural and optical studies of CdZnTe films grown by hot wall epitaxy method at relatively low substrate temperatures were performed. Possible mechanisms and processes of self-organization that occur during the growth of such structures are considered. It is shown that at thickness of film more than 130 nm on the surface, large (lateral size 150 - 200 nm, height - up to 10 nm) and small crystals are observed. The thicknesses and energy of the band gap width of the CdZnTe films grown at different growth times were determined. It is shown that the film absorption edge in the transmission spectra depends on the film thickness and the reasons for the shift of the film absorption edge are discussed.

A Study in Red: The Overlooked Role of Azo-Moieties in Polymeric Carbon Nitride Photocatalysts with Strongly Extended Optical Absorption.

The unique optical and photoredox properties of heptazine‐based polymeric carbon nitride (PCN) materials make them promising semiconductors for driving various productive photocatalytic conversions. However, their typical absorption onset at ca. 430–450 nm is still far from optimum for efficient sunlight harvesting. Despite many reports of successful attempts to extend the light absorption range of PCNs, the determination of the structural features responsible for the red shift of the light absorption edge beyond 450 nm has often been obstructed by the highly disordered structure of PCNs and/or low content of the moieties responsible for changes in optical and electronic properties. In this work, we implement a high‐temperature (900 °C) treatment procedure for turning the conventional melamine‐derived yellow PCN into a red carbon nitride. This approach preserves the typical PCN structure but incorporates a new functionality that promotes visible light absorption. A detailed characterization of the prepared material reveals that partial heptazine fragmentation accompanied by de‐ammonification leads to the formation of azo‐groups in the red PCN, a chromophore moiety whose role in shifting the optical absorption edge of PCNs has been overlooked so far. These azo moieties can be activated under visible‐light (470 nm) for H2 evolution even without any additional co‐catalyst, but are also responsible for enhanced charge‐trapping and radiative recombination, as shown by spectroscopic studies.

Photoluminescence origin and non-contact thermometric properties in Pb2+-activated CaZrO3 perovskite phosphor

Based on high temperature solid state technique, a series of Pb2+/Sm3+ doped CaZrO3 perovskite phosphors have been successfully synthesized. Comparing with CaZrO3 host, the absorption edge of CaZrO3:x%Pb2+ samples exhibits a red shift with the increase of Pb2+ ions doping concentration. Analysis shows that the red shift of absorption edge can be attributed to the 1P1 level of Pb2+ ions which is just below the bottom of conduction band. By comparing the absorption and excitation spectra of CaZrO3:x%Pb2+ samples, it is found that the excitation band at 286 nm should be composed of two parts, MMCT and 1S0→3P1 transitions, respectively. The normalized excitation and emission spectra of CaZrO3:x%Pb2+ samples also confirm that the excitation band at 286 nm should be composed of MMCT and 1S0→3P1 transitions, and the emission band at 370 nm should come from the 3P1→1S0 transition. Based on the analysis of the absorption and excitation spectrum of CaZrO3:Sm3+, it indicates that the excitation band of CaZrO3:Sm3+ sample at 231 nm should be the O2--Sm3+ charge transfer state. In addition, the characterization of the temperature sensing properties demonstrates that the relative sensitivities of CaZrO3:Pb2+ and CaZrO3:Pb2+/Sm3+ samples have high stability. In the temperature range of 303–443 K, the relative sensitivity for CaZrO3:Pb2+ and CaZrO3:Pb2+/Sm3+ materials is in the range of 1.03%−1.32% K−1 and 0.89%−1.13% K−1, respectively. Therefore, the CaZrO3:Pb2+/Sm3+ material has great potential and application value in temperature sensing.

Study of the efficiency of increasing the Bi2O3 concentration on the optical, radiation shielding and strength characteristics of 0.5TeO2-(0.5-x)WO3-xBi2O3 glasses

The work is devoted to the study of the effect of changes in the concentration of Bi 2 O 3 in the structure of 0.5TeO 2 -(0.5-x)WO 3 -xBi 2 O 3 telluride glasses on the optical, radiation shielding and strength characteristics. A mechanochemical method with subsequent sintering at a temperature of 1000 °C was chosen as a method for obtaining glasses. This method of producing glasses allows obtaining amorphous-like glasses with high strength values. During the determination of strength properties, it was found that an increase in the Bi 2 O 3 concentration leads to an increase in strength by 30–50% at concentrations x = 0.2–0.25. During measurements of optical properties, it was found that an increase in the Bi 2 O 3 concentration leads to a change in the transmission value, as well as a shift in the fundamental absorption edge. During tests to determine the radiation shielding efficiency of the synthesized glasses, it was found that an increase in the Bi 2 O 3 concentration leads to an increase in the radiation shielding characteristics by a factor of 1.5–2 when absorbing gamma quanta with energies of 660–1270 keV, and in the case of low-energy gamma quanta, their almost complete absorption. • Changes in density and porosity depending on the concentration of Bi 2 O 3 dopant. • The optical properties of glasses, band gap and refractive index were determined using the UV–Vis spectroscopy method. • TWBO-4 and TWBO-5 samples the shielding efficiency is more than 93% that demonstrates that practically all gamma quanta are absorbed in these glasses. • The shielding efficiency greater than 50% for TWBO-4 and TWBO-5 samples in the case of shielding of gamma quanta with an energy of 1270 keV.

Investigation of the Photoluminescence and Nonlinear Optical Properties of Ce₂O₃-TiO₂ Nanocomposites.

This paper reports the photoluminescence and nonlinear optical (NLO) properties of Ce₂O₃-TiO₂ nanocomposites synthesized via sol-gel process with different concentrations of cerium. The physical characterization studies by means of XRD indicated for the successful incorporation of Ce into the lattice of TiO₂, while the UV-visible spectra for an absorption edge shift of TiO₂ to the higher wavelength side following the Ce addition, and FESEM analysis for the morphology and particles sizes of the synthesized materials. On testing of the photoluminescence properties recorded through time-resolved fluorescence (TCSPC) technique, a decrease in the intensity of TiO₂ with that of increased Ce concentration was observed and is due to an escalation in the number of oxygen vacancies. Further, the observation NLO properties for Ce₂O₃-TiO₂ was done by a Z-scan technique of 5ns continuous wave (cw) laser at 532 nm, where the involvement of active mechanisms in the nonlinear refraction and nonlinear absorption are due to the saturable absorption (SA) and nonlinear thermal effects.

Synthesis of α-Bismuth oxide nanoparticles, spectral characterization and their photocatalytic activity

α-Bismuth oxide nanoparticles (α-BiNPs) were synthesized using oxalic acid as a reducing agent. Synthesized nanoparticles were characterized by Ultraviolet-Visible spectroscopy (UV Vis-DRS), Photoluminescence (PL), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Thermo gravimetric-Differential Thermal analysis (TG-DTA), and High-Resolution Transmission electron microscopy (HR-TEM) coupled with selected area electron diffraction (SAED) pattern. The UV–DRS spectrum reveals the blue shift of absorption edge and the bandgap energy. The XRD pattern revealed the crystalline nature of the synthesized α-BiNPs. The decomposition of the samples was analyzed by TG-DTA analysis. The HR-TEM morphology confirms that the nanoparticles are in an irregular shape. The FT-IR spectrum confirms the Bi-O bond in α-BiNPs. The α-BiNPs exhibit 87 and 84% of photocatalytic activity against MB and CV. Therefore, the synthesized α-BiNPs can be used as a photocatalyst for environmental applications.

Theoretical investigation of Cs2InBiX6 (X = Cl, Br, I) double perovskite halides using first-principle calculations

Recently, study of non-toxic double perovskites halides has become attractive due to their outstanding tunable optoelectronic properties. We present the analysis of the electronic, optical and thermoelectric properties of Bi based double perovskites halides, Cs2InBiX6 (X = Cl, Br, I) using density-functional theory (DFT). The band structures computed using Trans-Blaha modified Becke-Johnson (TB-mBJ) potential show that band gap tuning from visible (1.84 eV) to infrared (0.65 eV) energy can be resulted by changing anions from Cl to I, respectively. The optical absorption reveals maximum absorption in the ultraviolet range, while absorption edge shifts from visible to infrared energy by changing Cl with I, respectively. Various computed thermoelectric parameters are consistent with the transport parameters. Higher power factor for Cs2InBiI6 shows that narrow band gap can be comparatively more suitable for thermoelectric applications. The calculated thermoelectric and optical parameters indicate Cs2InBiX6 (X = Cl, Br, I) suitable for applications in energy conversion and solar absorbing devices.

Synthesis, structural and thermal expansion investigation of La, Ce and Eu substituted Bi4(SiO4)3

A series of selected rare earth ions substituted bismuth silicates of the chemical formula Bi 4-x RE x (SiO 4 ) 3 (RE = La, Ce and Eu: X = 0.1, 0.2, 0.3) was synthesized by the solution method. Rietveld refinement study revealed that the compounds Bi 4 (SiO 4 ) 3 , Bi 3.9 La 0.1 (SiO 4 ) 3 , Bi 3.8 La 0.2 (SiO 4 ) 3 , Bi 3.7 La 0.3 (SiO 4 ) 3 , Bi 3.9 Ce 0.1 (SiO 4 ) 3 and Bi 3.9 Eu 0.1 (SiO 4 ) 3 were crystallized in cubic structure with I - 43d space group. Scanning electron microscopic images indicated that the larger and rod shaped particles were transformed into smaller and agglomerated ones when the rare earth ions were substituted for Bi ion in the octahedral site. UV–visible diffuse reflectance spectra displayed a shift in absorption edge upon rare earth ion substitution due to the overlapping of s-p transition band with Ln 3+ -O 2- charge transfer band. Bulk thermal expansion of the pure phases was tested using push rod dilatometer. The average coefficients of thermal expansion for Bi 4 (SiO 4 ) 3 , Bi 3.9 La 0.1 (SiO 4 ) 3 , Bi 3.9 Ce 0.1 (SiO 4 ) 3 and Bi 3.9 Eu 0.1 (SiO 4 ) 3 were found to be 5.19 x 10 −6 / ° C, 5.59 x 10 −6 / ° C, 7.10 x 10 −6 / ° C and 7.94 x 10 −6 / ° C, respectively. The effect of rare earth ionic substitution in thermal expansion behavior was investigated. • New rare earth substituted eulytite type ceramics were prepared by solution method. • Rietveld refinement study proved the formation of cubic phases with I - 43d space group. • The effect of rare earth ionic substitution was observed from SEM and UV-DRS. • Average thermal expansion coefficients the compounds were found to be in the range of 5.19–7.94 x 10 −6 /°C. • Heating and cooling cycles of thermal expansion showed different amounts of hysteresis.

Effect of glutathione capping on the antibacterial activity of tin doped ZnO nanoparticles

In the present study, we first synthesized pristine ZnO and Sn doped ZnO nanoparticles (NPs) then capped the synthesized NPs by Glutathione at different capping concentrations. The structural, morphological, and optical properties of synthesized NPs was examined by x-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), UV–visible, and energy resolved photoluminescence spectroscopy. The XRD analysis confirmed the formation of wurtzite crystal structure of ZnO nano-crystallites while TEM micrographs showed the formation of dendrite nanostructure at higher capping concentration of glutathione in Sn doped ZnO NPS. Strong absorption band around 2525 cm−1 in the IR spectrum indicates the presence of S–H stretching vibration of glutathione which has been disappeared in glutathione capped ZnO NPs. Blue shift in absorption edge was observed in glutathione capped ZnO NPs as compared to uncapped NPs. Moreover, the synthesized NPs showed excellent response against both Gram positive bacteria (Streptococcus sp. & Staphylococcus sp.) and Gram negative (E. coli & Klebsiella sp.) bacteria. Maximum zone of inhibition has been observed with glutathione capped Sn doped ZnO nanostructures. Hence, it can be concluded from the present investigation that the optimization of capping concentration will be very beneficial to exploit Sn doped ZnO semiconductor nanostructures as a coating material for different chemotherapeutic drugs.

Effect of surface doping of TiO2 powders with Fe ions on the structural, optical and photocatalytic properties of anatase and rutile

The effect of surface Fe-doping on the structural, photocatalytic, optical properties of polydisperse anatase and rutile TiO2 has been comprehensively studied. The TiO2 surface has been modified by Fe3+ ions through the adsorption from the diluted FeCl3 aqueous solutions. The prepared powders were characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) surface area analysis, temperature programmed desorption techniques (TPD), Raman and UV–vis spectroscopy. With the adsorption isotherms of Fe3+ ions from FeCl3 aqueous solutions, it was found that adsorption of Fe3+ ions on the anatase surface is twice more efficient compared to that one on the rutile. The XRD and Raman spectroscopy measurements confirmed the monophase structure of the Fe-doped TiO2 with a subtle change in the lattice parameters and O/Ti ratio compared to the undoped counterparts. The red shift of the UV absorption edge has been registered for the Fe-doped anatase resulting in a significant decrease of its bandgap from 3.2 to 2.7 eV. The photocatalytic destruction of organic dye Safranin T over the prepared Fe-doped TiO2 under UV irradiation has been investigated. The influence of various energetically nonequivalent active sites on the surfaces of anatase and rutile on their photoactivity is considered.

Doping and annealing effects on structural, optical and electrical characteristics of Sn-doped ZnS thin film

This work presents the fabrication of Zn1−xS:Snx thin films using the chemical bath deposition method and investigates the effects of Sn doping and annealing temperature on the structural, optical and electrical properties of ZnS thin films. The XRD patterns show that the relative intensities of the major diffraction peaks increase with Sn dopant incorporation and annealing temperature. Because high-temperature annealing forms several nucleation centers throughout the lattice and dopant incorporation enhances point defects leading to crystallite boundary mobility enhancement, crystallinity is also improved. UV–vis-NIR spectrophotometric studies revealed that the films have good transmittance that is larger than 75% in both visible and near-infrared regions and their optical bandgap ranges from 3.34 eV to 3.90 eV. Both the Sn content and annealing temperature cause the transmittance and the optical bandgap to rise. The absorption edge shifts towards the longer wavelength for higher Sn contents and annealing temperatures. Also, the decreased Urbach energy with increased Sn content or annealing temperature can be attributed to the reduced structural disorders and dislocations of ZnS crystals that are indicated by improved crystallinity. Electrical characterization by the two-point probe method exhibits that at higher annealing temperature grain boundary scattering limits the number of mobile carriers by increasing interatomic binding. On the other hand, due to increased carrier concentration and decreased dislocations resulting from the Sn content or annealing, localized carriers dominate in the bulk crystal state and require higher activation energy to replace an interstitial atom and excite the bulk states.

Investigation of structural and optical properties of spin coated TiO2:Mn thin films

In the current work, we have deposited and studied various properties of spin coated undoped and Mn doped TiO 2 films annealed at 400 °C on glass substrate. The influence of Mn dopant concentrations on the properties of TiO 2 thin film is detailed. X-ray Diffraction (XRD), Raman spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), Atomic Force Microscopy (AFM), UV–Vis spectroscopy and Photoluminescence (PL) studies were carried out to determine the structural parameters, surface morphology/topography and optical properties of TiO 2 films. The XRD pattern of both undoped and TiO 2 :Mn thin films have exhibited (101) plane as a preferential orientation confirming the presence of anatase phase and same reflected in the Raman study. AFM image analysis reveals an improvement in surface roughness with an increase in Mn concentration indicating the coalescence of smaller crystallites. FESEM image analysis also confirmed the effect of Mn on surface morphology. UV–Vis spectroscopic measurements indicated a red shift of absorption edge upon doping. Refractive index calculation confirmed the densification of the films with increase in Mn concentration. From the PL study, luminescence property of TiO 2 was found to improve upon Mn doping. • Mn doped TiO 2 thin films were successfully deposited by spin coating method. • XRD and Raman measurements demonstrate the presence of the pure anatase phase. • Mn doping induced defects such as vacancies and interstitials are reported. • TiO 2 :Mn thin films can be used for enhanced UV photodegradation of organic dyes.

XAS Diagnostic of the Photoactive State in Co(II) Azobenzene Complex in Organic Solvents

AbstractX‐ray absorption spectroscopy (XAS) was used to characterize the structure of the photoactive Co(II) azobenzene complex. Optical absorption spectra show that photoinduced changes occur only in dimethylformamide (DMF) solvent, while in acetonitrile, this complex is photochemically inactive. Co K‐edge XAS spectra indicate 6‐coordinated species in acetonitrile with a structure similar to one in the crystalline form of the complex. However, in DMF, an activation process occurs related to the decrease of coordination number, bond shortening and absorption edge shift to the higher energies. Quantitative analysis indicates that observed spectral changes are related to the high spin ‐ low spin transition in the Co complex accompanied by the bond dissociation and solvent coordination.

Optically Active TiO2:Er Thin Films Deposited by Magnetron Sputtering.

Titanium dioxide photoanodes for hydrogen generation suffer from a profound mismatch between the optical absorption of TiO2 and the solar spectrum. To solve the problem of low solar-to-chemical efficiency, optically active materials are proposed. In this work, TiO2 thin films containing erbium were deposited by radio frequency RF magnetron sputtering under ultrahigh vacuum conditions UHV. Morphology, structural, optical and electronic properties were studied. TiO2:Er thin films are homogenous, with uniform distribution of Er ions and high transparency over the visible VIS range of the light spectrum. However, a profound 0.4 eV blue shift of the fundamental absorption edge with respect to undoped TiO2 was observed, which can be attributed either to the size effect due to amorphization of TiO2 host or to the onset of precipitation of Er2Ti2O7 nanocrystals. Near-infrared NIR to VIS up-conversion is demonstrated upon excitation at 980 nm, while strong green photoluminescence at 525 and 550 nm occurs upon photon absorption at 488 nm.

Crystallographic, Energy Gap, Photoluminescence and Photo-Catalytic Investigation of Cu Doped Cd0.9Zn0.1S Nanostructures by Co-precipitation Method

In this work, the controlled synthesis of Cd0.9Zn0.1S, Cd0.89Zn0.1Cu0.01S and Cd0.87Zn0.1Cu0.03S nanostructures by chemical co-precipitation technique was reported. The XRD investigation confirmed the cubic structure on Zn/Cu-doped CdS without any secondary/impurity related phases. No modification in cubic structure was detected during the addition of Zn/Cu into CdS. The reduction of crystallite size from 63 to 40 Å and the changes in lattice parameter confirmed the incorporation of Cu into Cd0.9Zn0.1S and also the generation of Cu related defects. The shift of absorption edge along upper wavelength region and elevated absorption intensity by Cu doping can be accredited to the collective consequence of quantization and the generation of defect associated states. The enhanced optical absorbance and the reduced energy gap recommended that Cd0.87Zn0.1Cu0.03S nanostructure is useful to enhance the efficiency of opto-electronic devices. The presence of Cd–S/Zn–Cd–S /Zn/Cu–Cd–S chemical bonding were confirmed by Fourier transform infrared investigation. The elevated green emission by Cu incorporation was explained by decrease of crystallite size and creation of more defects. Zn, Cu dual doped CdS nanostructures are recognized as the possible and also efficient photo-catalyst for the removal dyes like methylene blue. The enhanced photo-catalytic behavior of Zn, Cu dual doped CdS is the collective consequences of high density electron–hole pairs creation, enhanced absorbance in the visible wavelength, surface area enhancement, reduced energy gap and the formation of novel defect associated states. The stability measurement signified that Cu doped Cd0.9Zn0.1S exhibits superior dye removal ability and better stability even after 6 repetitive runs with limited photo-corrosion due to more charge carriers liberation, increased surface to volume ratio and creation of more defects.

Hydrogenation and Dopant Concentration-Dependent Structural, Optical, and Magnetic Properties of Synthesized Manganese/Aluminum–Codoped Anatase Nanoparticles

Abstract In the present work, titanium oxide (TiO2) codoped with 2 at % and 5 at % manganese/aluminum nanoparticle samples were synthesized by a coprecipitation method. The effects of manganese/aluminum dopant concentrations and hydrogenation temperatures on the structural, optical, and magnetic properties of the synthesized nanoparticles were studied. The investigation was aimed at considering manganese dopant ions as the foundation of stable magnetic properties and using Al3+ ions to supply itinerant electrons to study and synthesize a dilute magnetic semiconductor based on TiO2. The synthesized doped nanopowders were studied by several methods: X-ray diffraction, optical absorption spectroscopy, and magnetic measurements. It was established that the Anatase structure was the main structure of the synthesized codoped powders. The dopant and the hydrogenation did not introduce qualitative change in the phase structure of the powder. It was found that the hydrogenation increased the crystallite size, and the high-temperature hydrogenation (500°C) deteriorated the crystalline structures. The optical study was aimed at investigating the formation of F+-centers. The shift in the optical absorption edge was explained in terms of the Urbach and Moss-Burstein effects. The magnetic energy parameter was calculated to compare the strength of the resulting room-temperature ferromagnetic ordering in the samples. The greatest saturation magnetization parameter was 0.005 μB/manganese for the sample with the lower studied doping level (2 %) and hydrogenated (H) at low temperature (400°C); TiO2: 2 % manganese: aluminum–H (hydrogenated). The magnetic saturation magnetization was lowered for a higher doping level and higher hydrogenation temperature (500°C).