Region Of Electromagnetic Spectrum Research Articles

Gate Dependent Tunable Photosensitivity of Copper Phthalocyanine Based Organic Field Effect Transistors

Organic field effect transistor (OFET) based photodetector with high sensitivity was fabricated using copper phthalocyanine (CuPc) as photoactive channel for weak light detection. The device fabrication was conducted at room temperature using thermal evaporation technique. The opto-electrical properties of the devices under dark and light conditions are studied in this work. The performance of the photodetector depends on the incident wavelength and the intensity of the incident monochromatic light. We also show that the photoresponse could be tuned by the gate bias, which offers an additional benefit for practical applications. The transfer characteristics of the devices appear to enhance under light illumination. A slight enhancement in the carrier mobility was also detected upon illumination. Similarly, the subthreshold swing has been reduced from 1.31 ± 0.18 V/decade under dark condition to 0.76 ± 0.12 V/decade under illumination. Further impact of gate voltage on responsivity, on/off ratio and detectivity was also studied for the proposed device. The maximum photosensitivity and responsivity obtained from these OFET based photodetectors was 237.21 ± 8.02 and 7.77 ± 0.17 A/W respectively at a power density of 1 mW/cm2 while operating at an input voltage of 4 V and bias voltage of -5 V. Also, a maximum detectivity of 1.38 ± 0.03×1012 Jones was obtained under the same operating condition. The high sensitivity, good stability, low noise and fast response towards weak light with different wavelength imply that OFET based photodetectors are particularly suitable for photodetection in the visible region of electromagnetic spectrum.

Near‐Infrared‐Emitting Five‐Monolayer Thick Copper‐Doped CdSe Nanoplatelets

AbstractDoped nanocrystals are instrumental to the high‐performance luminescent solar concentrators (LSCs) and the color conversion devices. Recently, copper (Cu)‐doped three and four monolayer (ML) thick CdSe nanoplatelets (NPLs) have been shown superior to the existing Cu‐doped quantum dots (QDs) for their use in LSCs. However, additional improvement in the LSC performance can be achieved by further redshifting the emission into the near‐infrared (NIR) region of electromagnetic spectrum and increasing the absorbed portion of the solar irradiation. Cu‐doping into higher thicknesses of these atomically flat NPLs (e.g., ≥5 ML) can achieve these overarching goals. However, addition of the dopant ions during the nucleation stage disturbs this high‐temperature growth process and leads to multiple populations of NPLs and QDs. Here, by carefully controlling the precursor chemistry the successful doping of Cu in five ML thick NPLs by high‐temperature nucleation doping method is demonstrated. The optimized synthesis method shows nearly pure population of doped five ML thick NPLs, which possess ≈150 nm Stokes‐shifted NIR emission with high quantum yield of 65 ± 2%. Structural, elemental, and optical studies are conducted to confirm the successful doping and understand the detailed photophysics. Finally, these materials are tested experimentally and theoretically for their performance as promising LSC materials.

Electronic and optical properties of XN-ynes (X = B, Al, Ga): A first-principle study with many-body effects

This study aims to engineer electronic and optical properties of newly designed ‘graphyne with XN at hexagonal ring’ (labeled as XN-ynes, where X = B, Al, Ga). Except BN-yne, all XN-ynes are indirect band gap semiconductors, having larger gap than pristine graphyne. The Raman and IR spectra of XN-yne exhibit quite distinct feature with respect to pristine graphyne and strong Raman and IR line shows regular dependence on group IIIA element, thus may help to detect them during synthesis. The optical band gap calculated by G0W0 and Bethe-Salpeter equation (BSE) approach indicates the possibility of their usage as UV light absorber. The optical band gap is arises from π to π* transition. Not only optical band gap but also the strong absorption peak lies in UV region of electromagnetic spectra that also suggesting their possible use as UV light absorber. This study proposes an important initial step towards the applications of these newly designed XN-ynes.

Comprehensive study of the physical properties of Ba3Pn2 (Pn=N, P, As, Sb and Bi) through first principles technique

The structural, electronic and optical properties of Ba3Pn2 (Pn=N, P, As, Sb and Bi) compounds have been investigated using density functional theory based on Full potential linearized augmented plane wave (FPLAPW) method, as implemented in WIEN2K package. Wu-Cohan approach is used for structural parameters; lattice constant, optimized volume, bulk modulus and its derivative. For band structure calculations Modified Beck and Johnson Approximation (mBJ) is used, which predicted these materials as small and direct band gap semiconductors. The bond lengths between Ba and Pn are also calculated. Ba-d state and Pn-p state contribute in VB as well as in CB. The bonding nature calculation indicates the strong covalent bond between Barium (Ba) and Pnictogen group situated at corner of the unit cell position and ionic bond between Ba and Pnictogen group placed at unit cell centre. The optical parameters, like dielectric function (real and imaginary part), optical conductivity, absorption coefficient, index of refraction (real and imaginary) and reflectivity are also calculated, which is the IR region of electromagnetic spectra.

Viscosity sensitive semisquaraines based on 1, 1, 2-trimethyl-1H-benzo[e]indole: Photophysical properties, intramolecular charge transfer, solvatochromism, electrochemical and DFT study

1, 1, 2-Trimethyl-1H-benzo[e]indole based D-π-A type semisquaraines denoted as, SSK 1–3 were synthesized to investigate their primary photophysical properties, intramolecular charge transfer, solvatochromism, electrochemical properties and viscosity dependent enhanced emission. These semisquaraines contain 1, 1, 2-trimethyl-1H-benzo[e]indole and squaryl ring as donor and acceptor respectively. These dyes displayed absorption between 437 and 444 nm and emission in the range of 469–493 nm. Stokes shift of the synthesized compounds were in the range of 32–54 nm. The SSK 1–3 exhibited intense yellow-orange colored solid state fluorescence (Fmax = 520–549 nm). These dyes exhibited intramolecular charge transfer characteristics which were confirmed from their oscillator strengths, transition dipole moments, ground and excited state dipole moments and generalized Mulliken-Hash analysis (GMH). Moreover, the positive emission solvatochromic behaviour (Δλem = 21–24 nm) of these dyes was quantitatively analyzed from different solvent polarity plots. More interestingly, these D-π-A type FMRs displayed viscosity sensitive emission enhancement (23 to 32 fold increase in fluorescence intensity) in 99% methanol:glycerol system at the visible region of electromagnetic spectrum (450–650 nm). The molecular structures of SSK 1–3 were correlated with photophysical properties using density functional theory (DFT) and theoretical absorption spectra in eight different solvents were obtained from time dependent density functional theory (TD-DFT).

Fabrication and characterization of Zinc Telluride (ZnTe) thin films grown on glass substrates

In this paper we highlight the fabrication of Zinc Telluride (ZT) thin films grown onto glass substrates at 300 °C with varying thickness, in the range of 200 nm–1000 nm, by adopting the simplistic thermal evaporation technique with base pressure of 10−6 m bar. In addition, their structural and optical characterizations are also studied by exploring the influence of substrate annealing temperature and thickness of the samples. The morphology, crystalline nature and composition analysis of the thin films were done by X–ray diffraction and scanning electron microscopy. These results revealed that the sample having thickness around 1000 nm show crystalline nature while the samples having lower thickness demonstrate amorphous structure. The optical characterizations are described in the form of transmission spectra, refractive index, and absorption coefficient. The band gap values obtained by probing optical data, show that all the samples have direct band gaps in the vicinity of 2.25 eV. This suggests possible applications of ZnTe in optoelectronics devices in the visible region of electromagnetic spectra.

English

Satellite remote sensing has contributed immensely to the interpretation of linear features and other geological structures. In the study area, lineaments mapped were linear and planar features on satellite imageries that are expression of fractures, or faults within the subsurface.  Image lines of different contrast may extend from a few centimetres to several of metres in length. The Landsat imagery used has a spatial resolution of 30 x 30 m, and eleven spectral bands covering the visible and thermal region of electromagnetic spectrum. Four spectral bands were selected and used for the purpose of structural mapping namely; thermal infra-red band (Band 11), 11.5 to 12.51 µm; Short-wave infrared (Band 6), 1.57 – 1.65 µm; near Infrared (Band 5) 0.85 to 0.88 µm and Red (Band 4) 0.64 – 0.67 µm. Lineaments extracted from the digital satellite scene are concentrated mostly on the sandstone belt in the North-East close to Amasiri area. A total of 116 lineaments were generated. Seven thematic maps were produced; digital elevation model (DEM) was used to create surface features maps, shaded relief and slope while the regional lineament map was digitized from the enhanced colour composites of Landsat ETM (bands 7, 5 and 2) image using ARCGIS 10.0 software for visual extraction and delineation of geological structures which were also ground-truth. The area indicates major NE – SW to minor E – W orientation of lineaments. The lineament density identified indicates regional lineaments are of great importance as indexes for groundwater exploration, mineralization targets, rocks quarrying and structural interpretation.  Key words: Landsat imagery, geological structures, linear trends, ground-truth, Afikpo area Southeastern Nigeria. &nbsp

Luminescence Properties Of Rare Earth Sm3+ and Tb3+ Doped Ca3Al2O6 Phosphor For Solid State Lighting

Abstract The luminescence properties of Ca3Al2O6 doped with rare earth Sm3+ and Tb3+ prepared by self propagating combustion synthesis has been reported. The powdered X-ray diffraction study indicates the formation of desired phase of the sample. The photoluminescence study of Ca3Al2O6:Sm3+ reveals the orange – red emission at 567 nm and 603 nm monitored at 407 nm excitation wavelength, attributed to 4G5/2 →6H5/2, 6H7/2 transition of rare earth Sm3+. The Ca3Al2O6:Tb3+ phosphor gives characteristics emission corresponding to wavelength 419nm, 440 nm, 489nm and 545 nm wavelength when excited by wavelength of 379 nm in the UV region of electromagnetic spectrum. These emission wavelengths are characteristics of 5d →4f transition of rare earth Tb3+ namely 5D3 →7F5, 7F4 and 5D4 →7F6, 7F5. The results indicate that the Sm3+ and Tb3+ activated Ca3Al2O6 phosphor has promising applications in the field of ecofriendly solid state lighting.

Preparation of liposomal doxorubicin-graphene nanosheet and evaluation of its in vitro anti-cancer effects

In recent years there has been much interest in development of multifunctional drug delivery systems. In this work, liposomes that contain doxorubicin (Dox), a potent anticancer drug, and graphene nanosheets (GNS) were prepared. The GNSs have excellent optical properties, such as photoluminescence which enables tracking of the liposomes, high absorption in ultra violet region of electromagnetic spectrum which can be exploited in photodynamic and photothermal therapy, and low toxicity to mammalian cells. Nanoliposomes were prepared using the thin film hydration method. Dox and GNSs were loaded to the liposomes during the hydration of the lipid film. Liposomes were characterized and the profile of in vitro drug release, cellular uptake, and cytotoxicity of the prepared liposomes on MCF-7 cells were determined. Despite the earlier reports, the liposomes have kept their spherical structures in the presence of GNSs. The cytotoxicity of liposomal Dox and GNSs were shown to be higher than the free forms of them. Novel nanoliposomes that contain GNSs have provided a multi-functional system with the potential of tracking, photodynamic and photothermal therapy. Further improvements of this versatile nanosystem would be promising for treatment of cancer.

The effect of TiO2 nanopigment on the optical properties of polyester fabric in UV–VIS–NIR regions

AbstractThe particle size parameter is a key factor that affects radiative properties of nanopigments, and consequently, pigments of the same type but different sizes represent different spectral performance. Therefore, current study dealt with a systematic experimental investigation on the effect of TiO2 pigmented coatings on spectral reflectance and color performance of white and colored polyester fabrics in UV, VIS, and NIR region of electromagnetic spectrum, with a special emphasis on VIS region. In order to accomplish this target, polyester fabrics were coated with TiO2 nanopigment with various concentrations and different diameters, and their reflectance spectra were measured using spectrophotometric method. Two‐way analysis of variance (ANOVA) was utilized to investigate the significance of the effect of TiO2 nanopigment on the color performance of coated fabrics. According to experimental observations, an organized color shift appears in color coordinate of fabrics coated with TiO2 nanopigment of various sizes. Moreover, although TiO2 nanopigment with 35 nm diameter has the most significant impact on short wavelength region (UV region), the effect of pigment with 250 nm diameter is more noticeable on NIR region as long wavelength region.

Defect-assisted symmetric cleavage of naphthalene sulphonic acid group in azo dyes using β-In2S3 quantum dots as visible light photocatalyst

Naphthalene sulfonic acid, which is used in the synthesis of azo dye pigments, rubber processing chemicals and pharmaceuticals, is a carcinogenic substance that pollutes water bodies. In this work, we report on the visible light-driven symmetric cleavage of naphthalene sulfonic acid group, present in methyl orange dye and its conversion into the intermediate compounds. These compounds further degrade to inorganic ions such as carbon-di-oxide, nitrates, sulfates, water, and chlorine. Complete degradation of the dye, under visible light irradiation, is attained using β-In2S3 quantum dots as photocatalyst. During homogenous precipitation process, the β-In2S3 quantum dots (~ 9 nm) self-assemble to form microflowers (~ 50 nm) with high surface-to-volume ratio. These quantum dots exhibit size-dependent, active F2g, Eg and Ag1 Raman modes with peaks at ~ 150 cm−1 (In–In stretching mode), 219 cm−1 (In–S bending mode) and 300 cm−1, corresponding to the vibrational modes of cubic phase β-In2S3. The cubic phase β-In2S3 quantum dots are photoactive under visible light exposure and releases highly oxidizing OH· radicals. They have strong band-to-band emission in ultraviolet region (~ 380 nm) and exhibit broad band defect emission with maxima at blue (~ 484 nm), green (~ 580 nm) and red (~ 600 nm) region of electromagnetic spectrum. The emission intensity from these defect energy bands, which are due to sulfur vacancy, indium interstitials and oxygen incorporation, are tuned by varying the In-to-S ratio in the sample. These defects enhance their visible light absorption coefficient and assist in improving the photocatalytic efficiency of the cubic phase β-In2S3 quantum dots. Thus, defect-assisted complete (100%) photodegradation of the azo dye is achieved using cubic β-In2S3 quantum dots with low In-to-S ratio (1:1), low mass of 20 mg and minimum irradiation time (30 min). These photocatalysts can be reused 4 times under 30-min visible light irradiation. Cubic β-In2S3 quantum dots-microflowers is a highly efficient, ecofriendly photocatalyst, which even in very low concentration can remove toxicity from the dye-contaminated water, by exposure to direct sunlight for 30 min.

Absorber and sensor applications of complimentary H-shaped fishnet metamaterial for sub-terahertz frequency region

The progress in the technology of manufacturing new materials increases the usage of Terahertz (THz) region, which is considered as the last explored region of electromagnetic spectrum. In biological, chemical, sensing and detecting applications THz region is started to be used widely. We proposed a unique fishnet metamaterial (MTM) absorber and metasensor that can be used to detect and characterize new materials which are produced for THz region. First of all, the reflection and absorption characteristics of fishnet MTM were analyzed. Perfect absorption was achieved by 97.3% absorption rate and with assisting from electric field and surface current distributions we explained the electromagnetic theory behind the frequency resonances. For sensory application, the material that is going to be detected was added as a single and double overlayer (OL) to proposed fishnet MTM and fishnet MTM absorber sensor. The shifts in the resonant frequencies were observed for the change in permittivity and thicknesses of the OL materials. From the analysis of resonant shifts it is proved that the proposed structure shows high sensing ability in THz region.

Composition dependent microstructure and optical properties of boron carbide (BxC) thin films deposited by radio frequency-plasma enhanced chemical vapour deposition technique

BxC thin films were deposited on silicon (100) and sodalime glass substrates using Radio Frequency Plasma Enhanced Chemical Vapour Deposition (RF-PECVD) technique, at different substrate self-bias varying from -100V to -250V. Optical property, structure and stoichiometry of the films were determined by spectrophotometry, X-ray diffraction and proton elastic backscattering spectrometric measurements respectively to investigate the effect of film composition on microstructure and optical properties. Film refractive index at a typical wavelength of 400 nm increased from 1.87 to 1.97 on account of increasing packing density of the films with substrate self- bias. Decrease in direct and indirect optical band gap with increasing substrate self-bias, has been explained on the basis of compositional variation i.e. boron/carbon stoichiometric ratio. Finally, soft X-ray reflectivity in the wavelength range of 40 Å–360 Å has been measured to explore its potential for application as optical material in this region of electromagnetic spectrum.

Lasing without population inversion in a four-level Y-type configuration in double quantum dot system

This work discusses lasing without inversion in Y-scheme in a double quantum dot nanostructure. This new type of lasing, which results from the quantum interference of spontaneous emission components, was not discussed earlier in quantum dot nanostructures. It is found that both pumping and cycling fields control the laser emission. The decrease of the cycling detuning increases the possibility of lasing. Probe detuning controls the width of the absorption bath (electromagnetic-induced transparency window) of this structure. This phenomenon can have an interesting application for developing sources of coherent radiation in a region of electromagnetic spectrum where the implementation of traditional laser schemes is difficult.

Design and characterization of asymetrical super-lattice Si/4H-SiC pin photo diode array: a potential opto-sensor for future applications in bio-medical domain

Photo-sensors are integral part of different bio-medical diagnostic equipment. Each type of bio-molecules possess unique spectral fingerprint in visible wavelength region of electro-magnetic spectrum. Now-a-days, the enhancement of quantum-efficiency and photo-responsivity of such bio-medical opto-sensors, for accurate identification of virus/anti-bodies in blood by optical means, is a big challenge to medical-device Engineers. The authors have addressed this issue in this research paper by proposing a novel structure of asymmetrical Si/4H-SiC super-lattice pin diode array for the development of high-sensitive visible light (300–800 nm) sensor on native substrate. The simulation experiment is carried out by developing a generalized large-signal quantum modified drift–diffusion simulator incorporating three different modes of carrier generation-recombination under light and dark conditions: avalanching, tunneling and photo-irradiation. The validity of the model has been established by comparing the simulation results with those of experimental observations. A good agreement between theory and experiment, under similar biasing conditions, establishes the validity of the developed model. The characteristics analysis depicts that the quantum efficiency of the designed single photo-sensor is ~ 65% within 400–700 nm wavelength region, whereas, the same enhances to nearly ~ 90% with a 3 × 3 photo-sensor array based on asymmetrical super-lattice single pin devices. In visible wavelength region, the simulated photo-sensors (both single and array) have demonstrated significant photo responsivity. The photo-responsivity values, at 500 nm wavelength of incident radiation, are observed to be 0.65 A/W for a single photo-diode and 0.85 A/W for a 3 × 3 combination of photo-diode array. This clearly establishes the potentiality of the asymmetrical super-lattice pin-array as a visible photo-sensor for future application in developing medical instruments. A comparative analysis of Si and Si/4H-SiC asymmetrical super-lattice photo-sensors establishes the superiority of the later as a high-sensitive visible light-sensor in terms of better photo-responsivity and quantum efficiency. To the best of authors’ knowledge, this is the first report on Si/4H-SiC super-lattice pin photo-sensor array in the visible range of optical irradiation. The experimental feasibility of the device and a proposed circuit for future bio-medical implementation are also incorporated in the present research-paper for further development.

Bandgap Engineering in $$\hbox {TiO}_{2}$$ TiO 2 –Ge Nanocomposite Thin Films

Titanium dioxide–germanium ( $$\hbox {TiO}_{2}$$ –Ge) composite thin films were prepared by pulse laser deposition technique using third harmonic (355 nm) of Nd:YAG laser at fluence of $$12.73\,\hbox {J/cm}^{2}$$ . Films were grown on n-type Si (100) substrate using $$\hbox {TiO}_{2}$$ –Ge composite target. The bandgap was tailored by varying the composition of $$\hbox {TiO}_{2}$$ –Ge composite films based on the variable substrate–target distance from 5–8 cm. Ge concentration in $$\hbox {TiO}_{2}$$ matrix was measured through electron-dispersive X-ray spectroscopy and concentration variation from 0.9–25.3% was observed. Crystalline structure of thin films was analysed through X-ray diffraction, whereas micro-strains and dislocation density is also calculated through different X-ray diffraction peaks. A detailed study of the various polymorphs of $$\hbox {TiO}_{2}$$ and presence of Ge in crystalline form was carried out through Raman spectroscopy. Direct and indirect absorption transitions were observed through ultraviolet and visible spectroscopy. Absorption edge shifted to visible region of electromagnetic spectrum is associated with a possible quantum confinement effect in Ge or strain generated due to lattice mismatch of Si substrate and Ge with $$\hbox {TiO}_{2}$$ . Absorption transitions of thin film containing 2.6% Ge were observed in visible region along with the emission in the same spectral region observed through photoluminescence spectra.

Zinc Interstitial Rich ZnO Honeycomb Nanostructures for Deep UV Photodetection

Pristine ZnO nanostructures (NSs) are less sensitive to deep UV radiations, which restrict their usage to near UV region only. In order to extend its usability in deep UV region; Zn interstitial rich honeycomb (HC) NSs of ZnO is developed. The device shows remarkably high photoresponsivity of 1150 A W−1 in deep UV region (λ = 254 nm). Additionally, enhanced deep UV photosensitivity is observed and can be attributed to the incorporation of Zn ions in ZnO lattice and large surface to volume ratio of HC NSs. Furthermore, in dark conditions, the width of the depletion region is comparable to the thickness of HC NSs (20 nm) that results in complete depletion of charge carriers in NSs, which results in significant reduction in dark current. Moreover, HC NSs are provided continuous conduction path which eliminates the potential barrier forming at the NSs interfaces, resulting in efficient charge transportation. The measured photocurrent to dark current ratio is as large as ≈6 orders of magnitude. Such large photosensitivity in the deep UV region of electromagnetic spectrum makes these devices a promising candidate for development of deep UV photo‐detectors for commercial applications.

Optical properties of Meloxicam in the far-infrared spectral region

One of the most commonly used nonsteroidal anti-inflammatory active pharmaceutical ingredient called Meloxicam has been characterized spectroscopically both by Terahertz (THz) time domain spectroscopy (THz-TDS) and by Fourier Transform Infrared (FTIR) spectroscopy in far-IR regions of electromagnetic spectrum; 0.2 THz–20 THz. While many relatively sharp features are observed in the far-IR range between 2 THz–20 THz as expected for being an organic substance, very distinct and relatively strong absorption bands are also observed at 1.00, 1.66, 2.07 and 2.57 THz in the THz range. These well separated, defined, and fairly strong spectral features can be used for discrimination and quantification of Meloxicam in drug analysis. Frequency dependent refractive index of the drug was determined in a range of 0.2 THz–2.7 THz, where an almost constant index was observed with an average index of 1.75. Powder XRD, and solid-state Density Functional Theory (SS-DFT) calculations were utilized to determine the crystalline form of the Meloxicam sample in its enolic crystalline form. Single molecule DFT calculations were also performed in all four possible structures of Meloxicam. In addition, the capability of THz waves transmission through common packaging materials is demonstrated for possibility of future on-site analysis. The results suggest that drug analysis will be possible to perform not only at every stage of manufacturing without destruction but also directly at the shelf of a market after development of portable THz technologies.

Synthesis of CdO:SnO2 alloyed thin films for solar energy conversion and optoelectronic applications

CdO:SnO2, alloyed thin films were successfully deposited on glass substrates under the deposition condition of 60 °C of NaOH solution, using two solution based methods: successive ionic layer adsorption and reaction and solution growth technique. The crystallographic studies were done using X-ray diffractometer and scanning electron microscope. The deposited alloyed samples were annealed between 100 and 250 °C using Master Chef Annealing Machine. Rutherford backscattering Spectroscopy analysis confirmed the percentage of the elements of cadmium, tin, and oxygen in the alloyed thin films. The optical characterization was carried out using UV-1800 double beam spectrophotometer. The alloyed thin films of samples A14 and A16 of CdO:SnO2 show optical transmittance of 16–60% in the ultraviolet region, 61–59% in the visible, and 59–58% in the near-infrared regions of electromagnetic spectrum for sample A14 annealed at 100 °C. Sample A16 annealed at 150 °C has an optical transmittance of 27–70% in the ultraviolet region, 70–84% in the visible and 85–87% in the near infrared regions of electromagnetic spectrum. The two samples, have equal direct wide band gap of 3.70 ± 0.05 eV. From the spectral qualities, these compound alloyed thin films may be found useful in heat mirror applications, active layer in various types of solar cells and passive layer in heat and cold mirror application, galvanizing materials. It can also found interesting as semiconductor materials for electronic applications.

Soybean varieties discrimination using non-imaging hyperspectral sensor

Infrared region of electromagnetic spectrum has remarkable applications in crop studies. Infrared along with Red band has been used to develop certain vegetation indices. These indices like NDVI, EVI provide important information on any crop physiological stages. The main objective of this research was to discriminate 4 different soybean varieties (BMX Potência, NA5909, FT Campo Mourão and Don Mario) using non-imaging hyperspectral sensor. The study was conducted in four agricultural areas in the municipality of Deodápolis (MS), Brazil. For spectral analysis, 2400 field samples were taken from soybean leaves by means of FieldSpec 3 JR spectroradiometer in the range from 350 to 2500 nm. The data were evaluated through multivariate analysis with the whole set of spectral curves isolated by blue, green, red and near infrared wavelengths along with the addition of vegetation indices like (Enhanced Vegetation Index - EVI, Normalized Difference Vegetation Index - NDVI, Green Normalized Difference Vegetation Index - GNDVI, Soil-adjusted Vegetation Index - SAVI, Transformed Vegetation Index - TVI and Optimized Soil-Adjusted Vegetation Index - OSAVI). A number of the analysis performed where, discriminant (60 and 80% of the data), simulated discriminant (40 and 20% of data), principal component (PC) and cluster analysis (CA). Discriminant and simulated discriminant analyze presented satisfactory results, with average global hit rates of 99.28 and 98.77%, respectively. The results obtained by PC and CA revealed considerable associations between the evaluated variables and the varieties, which indicated that each variety has a variable that discriminates it more effectively in relation to the others. There was great variation in the sample size (number of leaves) for estimating the mean of variables. However, it was possible to observe that 200 leaves allow to obtain a maximum error of 2% in relation to the mean.