Luminescence Intensity Of Eu Research Articles

Synthesis and photoluminescence properties of Ba3(PO4)2:Eu3+/2+ phosphors

Single-phase phosphors of Ba3–хEu2х/3(PO4)2 (x = 0.01, 0.02) were obtained for the first time using solid-phase synthesis. These phosphors are isostructural to the palmierite mineral. The self-reduction of Eu3+ to Eu2+ in the Ba3(PO4)2 host was observed in air at high temperature. The dependence of luminescence intensity on temperature was studied over a broad range of 80–500 K. The luminescence intensity of Eu3+ is significantly depends on temperature and decreases as the temperature increases, while Eu2+ emission remains stable between 150 and 500 K. Eu3+ ions incorporated into the polyhedra of the M1 sites of the Ba3(PO4)2 structure demonstrated improved thermal stability compared to Eu3+ ions in the polyhedra of the M2 sites. Photoluminescence spectra, when excited at 395 nm, consist of intense bands at 585 nm and 610 nm, typical for Eu3+ cations. When excited at 330 nm, the luminescence spectra display a broad band centered at 425 nm, typical for Eu2+ cations. The resulting orange-red phosphors have potential applications in solid-state lighting.

Enhanced photoluminescence of K7CaY2(B5O10)3:Eu3+,Sm3+/Gd3+ phosphors through energy transfer and their applications in LED lights for plant growth

A series of K7CaY2−x(B5O10)3:xEu3+ (KCYB:xEu3+) phosphors have been successfully synthesized using a high-temperature solid-state method, while Sm3+ and Gd3+ ions were co-doped to enhance the luminous performance. The crystal structure and occupation position of Eu3+/Sm3+/Gd3+ in the borate K7CaY2(B5O10)3 host were investigated by XRD technique and Rietveld refinement data analysis. Under the characteristic excitation of Sm3+/Gd3+, it was found that the luminescence intensity of Eu3+ could considerably increase due to the energy transfer from Sm3+/Gd3+ to Eu3+ in KCYB, which was also increased even under 393 nm excitation (transition of Eu3+). To evaluate the sensitization of Sm3+/Gd3+ to Eu3+, the doping contents of Sm3+ and Gd3+ ions were fixed. The photoluminescence performance and lifetime decay curves of all co-doped samples were tested. The higher energy transfer efficiencies for Sm- and Gd-doped KCYB:Eu3+ phosphors reached 31.45% and 57.49%, respectively. The dipole-dipole interaction has been demonstrated to be the dominant energy transfer mechanism. KCYB:Eu3+,Sm3+/Gd3+ phosphors exhibit red light emission at 610 nm with a high quantum yield (86.98%) and color purity (100%), good thermal stability (57.97%@473 K), and the emission spectra lie within the red photopigments (PR) absorption spectra of plants. These results show that the prepared K7CaY2(B5O10)3:Eu3+,Sm3+/Gd3+ phosphors may provide promising options for red phosphors in plant lighting applications.

Luminescent ionic lattice occupation and wide tunable emission spectra of La2MgZrO6:Bi3+,Eu3+ double perovskite phosphors for white light LED

La 2 Mg 1– x /2 Zr 1– x /2 O 6 : x Bi 3+ ( x = 0.01–0.035, abbreviated as LMZ:Bi 3+ ) and La 2– y Mg 0.99 Zr 0.99 O 6 :0.02Bi 3+ , y Eu 3+ ( y = 0.1–0.11, abbreviated as LMZ:Bi 3+ ,Eu 3+ ) double-perovskite phosphors were prepared through high-temperature solid-phase method. The emission spectrum of LMZ: x Bi 3+ ( x = 0.01–0.035) phosphors excited at 353 nm is asymmetric in the range between 375 and 650 nm, showing strong green light. There are two luminescent centers of [Mg1/Zr2–O 6 ] and [Mg2/Zr1–O 6 ] for Bi 3+ occupation, which were analyzed through different excitation wavelengths, Gaussian fitting peaks, fluorescence decay curves and Rietveld refinement of powder X-ray diffraction data. Through deep study of the luminescent lattices in the LMZ matrix, the green to blue tunning-emission is observed by different excitation wavelengths. In addition, red emission is obtained by co-doping Bi 3+ /Eu 3+ , and adjustable emission was investigated by changing the content of Eu 3+ in the co-doped phosphor formulation, so it is converted from green emission to red emission. The above results demonstrate how to tune emission color by co-doping rare earth ions in the double perovskite phosphor, which is attractive for future applications. The Gaussian deconvolution of the emission spectrum of LMZ:Bi phosphors was performed to obtain two sub-Gaussian components, and the selective site occupancy of Bi 3+ was analyzed. By co-doping Bi 3+ and Eu 3+ , the luminescence intensity of Eu 3+ can be effectively improved.

Influence of charge compensation on the photoluminescence and temperature sensing of zinc titanate composites

Eu3+ activated zinc titanate red-emitting phosphors have been synthesized by a solid state reaction, and Li+ is added as the charge compensator to tune the optical performances of the phosphors. The structure of samples synthesized at different temperature reveals temperature dependence. The crystallization of particles is improved with increasing calcination temperature. The surface morphology and element distribution of the samples are observed by scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS). Various elements are evenly distributed in the matrix materials. The luminescence intensity of Eu3+ is effectively improved by co-doping Li+, and the luminescence intensity of the phosphor with Li+ content of 5 mol% and 7 mol% is twice than that of the phosphor without Li + when the annealing temperature is 600 °C. While the influence of Li + on the photoluminescence performance becomes weaker with the annealing temperature increasing. The highest relative sensitivity of 0.65%/K is obtained in the sample annealed at 1000 °C, which is not affected by the Li+ dopants.

Люминесцентный хемосенсор для детектирования паров диметиламина и аммиака

The interaction of tris-dibenzoylmethanate Eu(III) with dimethylamine and ammonia vapors was investigated. It was found that when vapors of aqueous solutions of analytes are exposed to tris-dibenzoylmethanate Eu(III) impregnated into the SiO2 matrix, an optical response is observed in the form of an increase in the luminescence intensity of Eu(III). Changes in the luminescence spectra and luminescence excitation of this sensor are analyzed, both under the quenching action of water vapor and under the sensitizing action of analyte vapors. The main points recorded in the excitation spectra are noted, which are important for understanding the processes occurring in the near environment of the lanthanide center. The luminescent chemosensor is promising for creating sensors for detecting ammonia and amines in food safety control and environmental monitoring. Shishov A.S., Mirochnik A.G.

Luminescent chemosensor for detecting dimethylamine and ammonia vapors

The interaction of tris-dibenzoylmethanate Eu(III) with dimethylamine and ammonia vapors was investigated. It was found that when vapors of aqueous solutions of analytes are exposed to tris-dibenzoylmethanate Eu(III) impregnated into the SiO2 matrix, an optical response is observed in the form of an increase in the luminescence intensity of Eu(III). Changes in the luminescence spectra and luminescence excitation of this sensor are analyzed, both under the quenching action of water vapor and under the sensitizing action of analyte vapors. The main points recorded in the excitation spectra are noted, which are important for understanding the processes occurring in the near environment of the lanthanide center. The luminescent chemosensor is promising for creating sensors for detecting ammonia and amines in food safety control and environmental monitoring. Keywords: europium(III), beta-diketonates, luminescence, ammonia, dimethylamine, sensors.

Structure and luminescence investigation of Gd3+-sensitized perovskite CaLa4Ti4O15:Eu3+: A novel red-emitting phosphor for high-performance white light-emitting diodes and plants lighting

A novel perovskite CaLa4Ti4O15:Eu3+ red-emitting phosphor was synthesized via a sol-combustion method, and Gd3+ was further co-doped into structure to improve the luminescence performance. The effects of Eu3+ doping and Gd3+ co-doping concentrations on the microstructure and luminescence properties were investigated. The red emission peaks of as-prepared phosphors originate from the 5D0→7Fj electron transitions of Eu3+ ions. Under 273 nm excitation, the luminescence intensity of Eu3+ was significantly enhanced through the energy transfer between Gd3+ and Eu3+ in CaLa4Ti4O15, and the luminescence intensity was also improved even under the excitation of 394 nm. By combining red-emitting CaLa4Ti4O15:Eu3+, Gd3+ phosphor with commercial blue and green phosphors on n-UV chip (λ = 395 nm), an eye-friendly w-LEDs with appropriate correlated color temperature (4761 K) and high color rendering index (Ra = 93.1) has been realized. The electroluminescence spectrum of the packaged red LED have an excellent match with the PR absorption of plants. In addition, when introducing CaLa4Ti4O15:Eu3+, Gd3+ phosphor into a commercial w-LED with YAG:Ce3+, the adjustable chromaticity parameters like CCT and CRI values can be obtained. These results demonstrated that the as-prepared CaLa4Ti4O15:Eu3+, Gd3+ phosphor is an outstanding candidate as the red component for the application of w-LEDs and plants lighting.

Synthesis and luminescent properties of LiLaSiO4:Dy3+, Eu3+ phosphors for white LEDs

A range of LiLaSiO4:xDy3+, yEu3+ phosphors were synthesized by high-temperature solid-phase method. Its phase composition, microstructure, luminescence properties, energy transfer mechanism, decay life and CIE color coordinates of the samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectrometer. In LiLaSiO4:xDy3+ phosphors, as the doping concentration of Dy3+ increases, the luminescence intensity of Dy3+ increases first and then decreases, the concentration quenching point of Dy3+ was x ​= ​0.04. In LiLaSiO4: 0.04Dy3+, yEu3+ phosphors, as the doping concentration of Eu3+ increase, the luminescence intensity of Dy3+ decreases gradually. However, the luminescence intensity of Eu3+ increases first and then decreases, the concentration quenching point of Eu3+ was y ​= ​0.05. In LiLaSiO4:0.04Dy3+, yEu3+ phosphors, there is energy transfer between Dy3+ - Eu3+. When the concentration of Eu3+ was y ​= ​0.20, the energy transfer efficiency is 62.50%, The energy transfer mechanism of electric dipole-electric dipole LiLaSiO4:xDy3+, yEu3+ phosphor. By tuning the doping concentration percentage of Eu3+ and Dy3+, the LiLaSiO4:xDy3+, yEu3+ phosphors can realize the lighting by single-matrix warm white light-emitting diodes (WLEDs).

Aqueous sol–gel synthesis, thermoanalytical study and luminescent properties of M0.05Eu0.05Ca0.9MoO4 (M=Li, Na, K, Rb, Cs) nanocrystallites

Nano-sized M0.05Eu0.05Ca0.9MoO4 (M=Li, Na, K, Rb, Cs) ceramics have been successfully synthesized by an aqueous sol–gel synthesis method using a tartaric acid as a ligand. In order to reveal the influence of the peculiarities of the nature of dopants effect into the crystallization of CaMoO4 double oxide, the thermal analysis of the as-prepared gels was performed. In addition, infrared spectroscopy was used in order to identify the functional groups from the characteristic stretching vibrations in the M–Eu–Ca–Mo–O tartrate gel precursors. Besides, to confirm the dynamics of growing crystallites in the final ceramics and to reveal the morphological changes on the surface, the x-ray diffraction and scanning electron microscopy were applied. Finally, photoluminescence measurements were used to estimate the optical properties of europium oxide as a dopant in the samples according to the nature of alkali metal. Therefore, according to the obtained results, it was estimated that luminescence intensity of Eu3+ ions is mainly affected by the chemical reaction, which takes place at about 973 K of temperature. This effect was partly confirmed from the results of the thermal decomposition of M–Eu–Ca–Mo–O tartrate gel precursors with an endothermic behaviour in the DSC curve, which indicates the crystallization mechanism of the CaMoO4 double oxide.

Ratiometric method based on silicon nanodots and Eu3+ system for highly-sensitive detection of tetracyclines

A silicon nanodots (SiNDs)-based ratiometric fluorescent sensor was designed to establish highly sensitive and selective method for detection of tetracyclines (TCs). The sensor comprises the blue fluorescence SiNDs were prepared by hydrothermal method synthesis from (3-aminopropyl)triethoxysilane and low-cost diethylenetriaminepentaacetic acid as the precursor, which serve as co-ligands for covalently bond with europium ions (Eu3+), and also the internal reference signal. In the presence of TCs, the luminescence intensity of Eu3+ was significantly increased, while the luminescence intensity of SiNDs was reduced. The fluorescence intensity ratio of I616/I450 of the sensor exhibits a sensitive linear range from 0.2 to 20 μM with a detection limit of 3 nM for the detection of TCs. This method was successfully applied to determine the levels of TCs in nature river samples and milk samples with good recoveries ranges from 92.2% to 107.4% and relative standard deviations (RSD, n = 3) was below 5%, providing a promising application future in real samples.

Enhancement of Eu3+ photoluminescence in sodium-aluminosilicate glasses by silver molecular clusters formed with Na+-Ag+ ion exchange method

Subject of Research. The paper considers the interaction of silver molecular clusters with trivalent europium ions in ion- exchanged layers of sodium-aluminosilicate glasses. Method. Glasses based on Na2O–ZnO–Al2O3–SiO2–F system anddoped with Sb2O3 and Eu2О3 were synthesized for the study. Silver ions were introduced into the synthesized glasses by low-temperature Na+–Ag+ ion exchange method; glass samples were immersed in a bath containing a melt of nitrate mixture 5AgNO3/95NaNO3 (mol%) at 320 °C for 15 minutes. To promote the growth of silver molecular clusters in ion-exchanged samples they were heat-treated at 350–450 °С for 20 hours. Heat treatment temperature was 500 °С for obtaining silver nanoparticles in the samples. Main Results. We have studied the spectral-luminescent properties of sodium-aluminosilicate glasses doped with silver molecular clusters and trivalent europium ions in ion-exchanged layers. Luminescence intensity of Eu3+ ions in the ion-exchanged glass with silver molecular clusters was found out to exceed considerably the intensity in the as-synthesized glass. Glass samples heat-treated at 450 °С are characterized by maximal emission intensity of silver molecular clusters and europium ions. Quenching of the luminescence was observed for the samples containing silver nanoparticles. Practical Relevance. Obtained results can be applied for developing phosphors in glass for LEDs and down-converters of ultraviolet radiation for solar cells

Effects of alkali metal as charge compensator on the luminescence properties of ZnWO4: Eu3+ phosphors synthesized by solid-state reaction

A series of ZnWO4:Eu3+, M+ (Li, Na, K) phosphors were prepared using a facile solid-state reaction method by sintering at 800 °C. The XRD patterns of the phosphors indicate that the Eu3+ and M+ ions have successfully been introduced into the ZnWO4 lattice. Their luminescent properties have been studied. The broad excitation peak from 280 to 315 nm by monitoring emission at 616 nm perfectly matches the wavelength range of deep UV LED based on AlGaN semiconductor. When the doping concentration of Eu3+ exceeds 2% in the ZnWO4: Eu3+, the luminescence intensity of Eu3+ gradually decreases due to the formation of impurity Eu2(WO)4. The alkali metals are added into the ZnWO4 as a charge compensator. After the introduction of alkali metals, emission spectra have changed obviously. The addition of Li+ can effectively promote the energy transfer from WO42− to Eu3+. The Commission Internationale de L'Eclairage (CIE) chromaticity color coordinates are calculated. The color of the emitting light can be tuned from greenish blue to white and finally to the red via co-doping different alkali metals.

Mineralization and optical properties of Eu3+-doped tricalcium silicate soaked in dilute K2HPO4 aqueous solution

Eu3+-doped tricalcium silicate (Ca3SiO5) was synthesized by two-step precipitation and combinated calcination method. The samples were investigated before and after soaking in dilute K2HPO4 aqueous solution for different times using X-ray diffraction method (XRD), scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray energy-dispersive spectra (EDS). The optical properties of as-prepared and mineralized samples were evaluated using luminescence spectroscopy respectively. The results showed that, with prolonged soaking time, Eu3+-doped tricalcium silicate gradually transformed into hydroxyapatite and showed good bioactivity. Meanwhile, the luminescence intensity of Eu3+ ion gradually decreased; the intensity ratio between electric dipole transition (5D0→7F2) and magnetic dipole transition (5D0→7F1) increased; the emitting color of mineralized samples under UV-lamp and its CIE coordinates changed from orange-red to deep-violet. These phenomena revealed that the mineralization of Eu3+-doped Ca3SiO5 can be monitored through the evolution of optical properties with prolonged soaking time.

Luminescent Properties of Hybrid Nanostructures Based on Quantum Dots of CdS, Europium 1,3-Diketonate, and Methylene Blue Molecules

The luminescent properties of hybrid nanostructures constructed from colloidal quantum dots (QDs) of CdS passivated with thioglycolic acid, europium(III) tris(tenoyltrifluoroacetonate), and methylene blue dye molecules are studied. Spectral features typical for the formation of core/shell QDs of the CdS/CdS:Eu3+ type are found. It is noted that the adsorption of the europium complex at the QD interfaces and the formation of QDs of the CdS/TGA/Eu3+ are probable. Spectral patterns that reveal nonradiative energy transfer from the recombination luminescence centers of CdS QDs to the Eu3+ ions in the CdS/CdS:Eu3+ and CdS/TGA/Eu3+ structures are obtained. This is manifested in quenching the recombination luminescence of QDs and in the ignition of the intracentric luminescence of Eu3+, which enhance with an increase in the concentration of the europium complex. When such structures are combined with methylene blue molecules, the half-width of the absorption spectra is found to increase by 10–15% with an unchanged position of the absorption band maximum. With an increase in the concentration of methylene blue molecules, decreases in the intensity of the recombination luminescence band of CdS QDs at a wavelength of 530 nm and in the luminescence intensity of Eu3+ ions and simultaneously the rise up of the fluorescence of methylene blue at a wavelength of about 675 nm are observed. At the same time, a decrease in the luminescence lifetime of the bands of QDs and europium ions are observed. It is concluded that the nonradiative excitation energy transfer from both the recombination luminescence centers and Eu3+ ions to methylene blue molecules takes place.

Complexation of Eu(III) in a Completely Incinerable Ionic Liquid System: A Luminescence Spectroscopy Approach

AbstractLuminescence study of europium(III) ion has been carried out in a completely incenerable (CHON based) ionic liquid system. The ionic liquid used in the study was trioctylmethylammonium nitrate ([N1888][NO3] while the extractant used was N,N‐dioctyl‐2‐hydroxyacetamide (DOHyA). The complexation of europium(III) in such type of ionic liquid system and its elaboration by luminescence study is highlighted for the first time in this paper. The luminescence behaviour of europium(III) was ascertained as a function of various parameters, such as aqueous phase acidity, extractant concentration, initial metal ion concentration, types of ionic liquid diluents etc. The luminescence intensity of Eu(III) was remarkably high in the ionic liquid medium at all aqueous phase acidity (0.1 M to 5 M HNO3) as compared to that of in aqueous phase. The luminescence lifetime of Eu(III) in this complex is in the range of 360 μs – 550 μs which is quite higher than that of aqueous phase (107 μs ‐ 130 μs), suggesting the luminescence enhancement is a result of reduction in non‐radiative decay channels in ionic liquid medium. The emission peak of Eu(III) in DOHyA was compared with that of DOMeA (N,N‐dioctyl‐2‐methoxyacetamide) in ionic liquid medium in order to highlight the presence of –OH group in DOHyA. The luminescence spectra of Eu(III) was also investigated by changing the type of aqueous phase acidity from nitrate ion to chloride ion and the results are detailed in the paper.

Influence of fluorinated chain length on luminescent properties of [formula omitted][formula omitted]-diketonate complexes

Five novel europium β-diketonate complexes containing a pyrazole fragment were investigated. The influence of the number of fluorine atoms in diketonate ligands on luminescent properties was analyzed. Luminescence intensity of Eu3+ complexes increases significantly when CH bonds with high oscillation energy are replaced with CF bonds with low oscillation energy as the efficiency of energy transfer is improved. Further extension of the fluorinated chain length results in a substantial decrease in non-radiative relaxation rates while the increase in luminescence decay rates is observed. The theoretical results elaborated in terms of Judd-Ofelt theory are in good agreement with the experimental data obtained by time-resolved luminescence spectroscopy.

New amorphous nanophosphors obtained by evaporation of silicates and germanates REE

Abstract Amorphous nanophosphors have been produced by pulsed electron beam evaporation of bulk phosphors of rare earth elements (REE) silicates and germanates with oxyapatite structure activated with europium. The processes of crystallization of amorphous nanopowders (NP) have been studied by differential scanning calorimetry and thermogravimetry (40–1400°C) methods. A modification of the Raman and IR spectra of the samples was found when the particle size decreased from bulk to nanostate due to insignificant polymerization of Si(Ge)O4 tetrahedra. The spectral and luminescence characteristics of the bulk samples as well as nanoamorphous samples have been examined. It was established that Eu3+ forms two types of optical centers. Upon the transition of Sr2Gd8(SiO4)6O2:Eu3+ phosphor from bulk state to nanostate during laser excitation, the luminescence intensity of Eu3+ ions increases 10 times. Blue and white amorphous nanophosphors have been obtained for the first time by evaporation of Ca2M8(SiO4)6O2:Eu (M=Y, Gd) and Ca2La8(GeO4)O2:Eu phosphors. Radiation reduction of ions Eu3+→Eu2+ in electron beam has been presumably found.

感温塗料を用いた赤外線ー可視光変換型熱イメージングデバイス

This paper reports optical read-out thermal imaging devices based on IR-to-visible conversion technique using temperature sensitive phosphor (Eu(TTA)3). Infrared emit from the observation object induces temperature change of a thermally isolated microstructure, of which the temperature can be read out by the luminescence intensity of Eu(TTA)3. Two types of imaging devices were fabricated and evaluated, one of which was made of vacuum deposited Eu(TTA)3 on a deep reactive ion etched thermal isolation structure, and the other was made using photo-patternable temperature sensitive paint combined with a transfer method. Both device can detect the temperature distribution, however the device using vacuum deposited Eu(TTA)3 had a better performance which can detect a human.

Effect of annealing on the structural, optical and emissive properties of SrWO4:Ln3+ (Dy3+, Eu3+ and Sm3+) nanoparticles

Lanthanide ions, Ln3+ (Dy3+, Eu3+ and Sm3+) doped SrWO4 nanoparticles were synthesized using ethylene glycol (EG) as a capping agent as well as reaction medium. The X-ray diffraction (XRD) study reveals that all the Ln3+ (Dy3+, Eu3+ and Sm3+) doped samples are well crystalline in nature with a tetragonal scheelite structure of SrWO4 phase. TG study reveals that the nanophosphors are thermally stable. Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy techniques were used to obtain the information about internal and external vibrational modes present in the SrWO4 structure. Optical properties were investigated using UV–vis and photoluminescence (PL) spectroscopy. The average crystallite size was calculated using Debye–Scherrer’s for as-prepared and 800°C annealed samples and is found to be in the range of ∼35–70nm.The luminescence intensity of Eu3+ doped SrWO4 nanoparticles under 364nm excitation wavelength reveals that 5D0→7F2 transition at ∼613nm (red) is more prominent than that of 5D0→7F1 transition at ∼590nm (orange). Also upon excitation by UV radiation, the SrWO4:Dy3+ phosphor shows the yellow and blue transition lines appearing at ∼572 and 484nm which are the characteristic electronic transitions of 4F9/2–6H13/2 and 4F9/2–6H15/2 emission line of Dy3+, respectively. Also Sm3+ doped SrWO4 nanophosphor shows its characteristic emission lines in the range of 550–720nm, corresponding to 4G5/2→6HJ (J=5/2, 7/2, 9/2 and 11/2) transitions of Sm3+ ions. The predominant orange red color can be attributed to 4G5/2→6H9/2 located at ∼642nm. This is related to the polarizing effect due to the energy transfer from WO42- to the Eu3+, Dy3+ and Sm3+ sites, respectively.Effect of annealing on the photoluminescence properties of samples has been studied and it was found that luminescence intensity increases up to ∼3 times on heating the samples at 800°C. This may be due to reduction in non-radiative decay channels pathways and reduced surface defects associated with the samples. These studies show that these Ln3+ (Dy3+, Eu3+ and Sm3+) doped SrWO4 nanophosphors may be used as potential candidates for the advancement in LEDs.

New probe for fluorescence detection of Azinphous ethyl, Malathion and Heptachlor pesticides

Luminescence quenching of long lived Eu(III)–Bathophenanthroline (Batho) probe of 1:2 stoichiometric ratio has been studied in acetonitrile in the presence of the pesticides Azinphous ethyl (P1), Malathion (P2) and Heptachlor (P3). The luminescence intensity of Eu(III)–(Batho)2 probe decreases as the concentration of the pesticide increases. Direct methods for the determination of the pesticides under investigation have been developed using the luminescence quenching of Eu(III)–(Batho)2 probe in solution. The detection limits were 0.68, 0.92 and 0.35µM for P1, P2 and P3, respectively. Stern–Volmer studies at different temperatures indicate that collisional quenching dominates for Azinphous ethyl, Malathion and Heptachlor. The binding constants (K) and thermodynamic parameters (ΔS°, ∆H° and ∆G°) of the interaction of pesticides with the complex were evaluated.