Characteristic Emission Peaks Research Articles

Synthesis and enhancement of photoluminescent properties in spherical shaped Sm3+/Eu3+ co-doped NaCaPO4 phosphor particles for w-LEDs

A series of Sm3+ doped and Sm3+/Eu3+ co-doped NaCaPO4 phosphors have been successfully synthesized via molten salt method. The structural, morphological, optical, photoluminescence and decay properties of the synthesized phosphors were investigated. Sm3+ doped phosphor exhibits excellent emission properties in the orangish-red region under n-UV excitation (403 nm), and the optimized doping concentration of Sm3+ was found to be 1.0 mol%. The excitation spectrum confirms that Sm3+/Eu3+ co-doped NaCaPO4 phosphors can be efficiently excited by both n-UV and blue LED chips. In the co-doped NaCaPO4:Sm3+/Eu3+ phosphors, the intensity of main characteristic emission peaks of Sm3+ decreased and Eu3+ increased with increasing Eu3+ ion concentration. The energy transfer (ET) from Sm3+ to Eu3+ was demonstrated to be quadrupole-quadrupole in nature by applying Dexter's ET formula and Reisfeld's approximation. Commission Internationale de l′Eclairage (CIE) chromaticity coordinates for co-doped samples lie in the red region. The decay time for the 4G5/2 level of Sm3+ decreases with increasing Eu3+ concentration, which also indicate the energy transfer from Sm3+ to Eu3+. These results indicate that Sm3+/ Eu3+ co-doped NaCaPO4 multifunctional phosphor is a promising and an attractive potential candidate for n-UV and blue excitation based w-LEDs.

Properties optimization of Er3+ doped lead–sodium–yttrium–fluoride phosphor through combining LCS–HSR method

Up-conversion luminescence materials sensitive to 1550 nm are of broad application prospects. One of the most important properties is that the phosphor should be ultrafine and dispersed well with excellent luminescence intensity in order to meet the matching application requirements of those image and detection devices. The low-temperature combustion synthesis method, a most popular method for the synthesis of ultrafine oxides, was adopted to synthesize the Er3+ doped lead–sodium–yttrium–fluoride phosphor using glycine as the fuel. Orthogonal experiments were carried out to determine the optimum cation molar-proportion. Dispersing agent (NH4)2SO4 was adopted to improve the dispersion state of the ultrafine phosphor and the high-temperature solid-state reaction process was performed to optimize its morphology and luminescence properties. The sample presents Er3+ characteristic emission peaks and its luminescence mechanism excited at 1550 nm was discussed.

Energy transfer and photoluminescent analysis of a novel color-tunable Ba2Y1-xV3O11:xSm3+ nanophosphor for single-phased phosphor-converted white LEDs

Metal nitrates are used to synthesize a series of novel Ba2Y1-xV3O11:xSm3+ nanophosphors via urea-assisted solution combustion route. X-ray diffraction (XRD), diffuse reflectance (DR), transmission electron microscopy (TEM) and photoluminescence (PL) spectroscopy were employed to analyse the structure, morphology, photoluminescent behaviour and energy transfer mechanism. Rietveld analysis over Ba2Y0.98Sm0.02V3O11 showed that Y3+ ions can be well-replaced by trivalent samarium ions without resulting any major alteration in the crystal structure of host lattice. Furthermore, the lattice parameters were determined for both the host as well as the doped composition. The Scherrer equation yielded an average particle size of 44 nm, which in turn was further confirmed by TEM micrographs. The optical band-gap of the host (3.92 eV) was calculated from the diffuse reflectance spectra. Moreover, the photoluminescence spectral studies showed that under near ultra-violet (NUV) excitation of 340 nm, our nanophosphor powder exhibits the characteristic emission peaks of trivalent samarium along with the emission of VO43− (501 nm) group. The excitation energy transfer from vanadate group to Sm3+ produced a systematic color tunablity in white region itself. The optimum Sm3+ concentration for better luminescence was found to be 2 mol%. The critical distance for energy transfer was calculated to be 29.02 Å, which in turn assisted to shortlist the mechanism responsible for luminescence-quenching (dipole-dipole) arising from the over-doping of the activator. The photoluminescence decay curves revealed the decay kinetics of 4G5/2 electronic state. Finally, the calculation of CIE color coordinates from emission spectra in MATLAB program unveiled a somewhat white-light emitter which may find potential applications in phosphor-converted white light emitting diodes (PC-WLED) under near-ultraviolet (NUV) excitation.

Prominent blue emission through Tb3+ doped La2O3 nano-phosphors for white LEDs

In this article, we report the tunable luminescence emission of Tb3+ doped La2O3 nanophosphors synthesized by a facile and effective Polyol method. The structural and surface morphological studies have been carried out by employing X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The XRD studies elucidate the proper phase formation and the results emanate from Raman spectroscopy of the as synthesized nanophosphor affirms it. The optical properties of the as fabricated nanoparticles have been investigated by Raman and photoluminescence (PL) spectroscopy. The PL spectroscopy shows the occurrence of excitation peaks at 305, 350 and 375 nm for 543 nm emissions, correspond to transition 5D4 →7F5. Emission spectra with 305 nm excitation exhibits characteristic emission peaks of Tb3+ion at 472, 487, 543 and 580 nm. The intensity of emission increases with Tb3+ concentration and is most prominent for 7 at% Tb3+ ion. The characteristic emissions of Tb3+ ion owes to the transition in which intensities of blue and green emission are prominent. The dominant intensity has been found for 472 nm (for blue emission). Commission international d 'Eclairage (CIE) co-ordinates have found in the light blue to green region. The research work provides a new interesting insight dealing with tunable properties with Tb3+ doping in La2O3 nanophosphors, to be useful for display devices, solar cells, LEDs and optoelectronic devices.

Sol-gel synthesis and luminescence properties of Ba2SiO4:Sm3+ nanostructured phosphors

Ba2SiO4:Sm3+ nanostructure phosphors have been synthesized by a simple sol-gel method. Phase evaluation, structural characteristics and photoluminescence properties of the synthesized Ba2SiO4:Sm3+ powders were studied using field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FTIR), and photoluminescence spectroscopy (PL). X-ray diffraction results showed that all synthesized samples were single-phase barium silicate (Ba2SiO4) and samarium (Sm) ions were incorporated into the lattice of Ba2SiO4. Adding samarium to barium silicate changed the microstructure from vermicular to spherical structures. The Photoluminescence spectrum of Ba2SiO4:Sm3+ phosphors exhibited characteristic emission peaks at 562 nm which is due to the 4G5/2 →6H7/2 transition of samarium ions and corresponds to the orange region. The results showed that the barium silicate activated with 0.08 mol samarium exhibited the highest PL intensity.

Piezoelectric Transformer Aided X-Ray Generation in Vacuum

The results of an experimental study of x-ray generation aided by a ceramic piezoelectric transformer placed in vacuum are presented. X-rays were emitted with the piezoelectric transformer tuned to resonance at about 20 kHz. A characteristic emission peak of a titanium target at energy of 4.5 keV against the Bremsstrahlung background was observed in the measured x-ray spectra. The maximum energy of the x-ray Bremsstrahlung reaches 12 keV. This means that the electrons are accelerated in vacuum in the field of the piezoelectric transformer to at least 12 keV.

The characterization of Ce/Pr-doped YAG phosphor ceramic for the white LEDs

Ce/Pr -doped YAG (Ce:Pr:YAG) transparent ceramics are fabricated by the vacuum sintering. The crystal structure and morphology, the energy transfer between Ce3+ and Pr3+, and luminescence properties are measured and discussed. The effect of the micrographs of the starting powders and the doping contents of Ce3+ and Pr3+ ions on the microstructure of YAG ceramic is also exhibited. In the photoluminescence spectra, the characteristic emission peaks of Pr3+ ions at 608 nm and 638 nm are observed, and therefore white light-emitting diodes (WLEDs) with improved color-rendering properties obtained by using modified Ce:Pr:YAG phosphors. The composite phase structure of ceramic phosphor is designed for improving the extraction efficacy and increasing the luminous efficacy by breaking the total internal reflection (TIR) at the interface between air and ceramic.

Four new rare-earth nitronyl nitroxide radical complexes: Magnetic and luminescent properties

Four new rare-earth nitronyl nitroxide radical complexes, [Ln(hfac)3(NITPh-Pa)2][0.5CH3(CH2)5CH3] (Ln = Gd(1), Tb(2), Dy(3), Ho(4), hfac = hexafluoroacetylacetonate, NITPh-Pa = 2-(3′,4′-dioxylmethylene-phenyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide), have been synthesized. The X-ray crystal structure analysis revealed that four compounds have similar mononuclear tri-spin structures, in which the Ln(III) ions are eight-coordinated by two nitronyl nitroxide radicals and three hexafluoroacetylacetonate ligands to form a slightly distorted dodecahedron. In complexes 1–4, isolated mononuclear molecules connect each other through intermolecular hydrogen bonds to form 3D supermolecular framework. Magnetic investigation indicates there are ferromagnetic interactions between Gd(III) ions and radicals in complex 1. Alternating current(ac) magnetic susceptibilities of complexes 2 and 3 show that there are no non-zero out-of-phase signal, which indicates the inexistence of slow magnetic relaxation. The luminescence properties of complex 2 exhibit the characteristic emission peaks of Tb3+ ions and the potential for recognition of Cr2O72− and Cr3+ ions. Furthermore, nearly linear at low concentration and the low detection limit (0.01 μM) indicate that complex 2 may potentially be acted as luminescence-based sensor for quantitative and highly sensitive detection of Cr2O72− ion.

Synthesis and Luminescent Modulation of ZnS Crystallite by a Hydrothermal Method.

Pure and Eu3+-doped zinc sulfide (ZnS) crystallites were synthesized through a hydrothermal method using water and ethanol (W/E) as the solvent. The powder samples have been characterized systematically using a number of characterization techniques such as X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, photoluminescence spectroscopy, and UV–vis absorption spectroscopy. The band gap of ZnS and ZnS/xEu3+ was calculated according to absorption spectroscopy, and an obvious red shift with the increasing molar fraction of Eu3+-doped ions was found. The luminescent mechanism of ZnS was explored by measuring the emission spectra of ZnS with different ratios of Zn and S. The emission spectra of ZnS/xEu3+ included the characteristic emission peak of ZnS and Eu3+ ions. The CIE chromaticity coordinates of the ZnS/xEu3+ sample varied with the molar fraction of Eu3+ ions. The emission intensity and morphology changed with the ratio of W/E in the process of hydrothermal reaction. The results indicate that the luminescence of the ZnS crystallite can be modulated by doping a certain amount of Eu3+ ions, changing the ratio of Zn and S, or adding moderate ethanol as the reaction medium.

Near UV excitable Eu-doped alumina nanophosphors synthesized by the microwave assisted solvothermal technique

Europium doped alumina nanophosphors have been synthesized by the microwave assisted solvothermal technique. The dependence of the photoluminescence response and structural features of these nanophosphors on the europium content and annealing temperature has been characterized for a wide range of compositions and thermal treatments. The nanophosphors are composed of a mixture of nanocrystalline γ-Al2O3 and EuAlO3, in addition to an amorphous alumina phase. The relative quantities of each phase depend on both the europium content and the annealing temperature. High europium content and/or annealing temperature lead to larger fractions of EuAlO3 nanocrystals having with poor luminescence characteristics, while lower temperatures and europium contents result in the predominance of γ-Al2O3 nanocrystals and amorphous alumina, showing much more efficient luminescent emission. The luminescence spectra from all samples show the characteristic red emission peaks from the Eu3+ ion associated with inter-electronic energy level transitions. However, the excitation spectra in these nanophosphors are dominated, by the 7F0–5L6 transition (395 nm), as opposed to the dominant charge-transfer related band at ~260 nm commonly reported for this material. The highest luminescence intensity was obtained for nanophosphors doped with 7.5 at.% of Eu, annealed at 900 °C, which exhibits a quantum yield of 45% when excited with 395 nm light.

Synthesis and luminescent properties of Tb3+ doped BaLa2ZnO5 nanoparticles

Nanophosphor powders of composition BaLa2ZnO5:Tb3+ have been synthesized via using urea assisted solution combustion method using metal nitrates as the precursor materials. The structural, morphological and luminescent properties have been investigated by powder X-ray diffraction (XRD) and photoluminescence (PL) spectroscopy. The Rietveld analysis showed that these nanophosphors crystallize in the tetrahedral phase with the 14/mcm (140) space group. The crystallite size was determined by Scherer formula and was found to be 70 nm. The photoluminescent excitation of these nanocrystals at 278nm yielded the characteristic emission peaks at 545nm and 489nm due to 5D4→7F5 (magnetic-dipole) and 5D4→7F6 (electric-dipole) transitions, respectively. The optimum activator concentration was found to be 3 mol% and the concentration quenching arising from the over-doping was attributed to the quadrupole–quadrupole interactions. The excellent luminescent profile of these nano-scaled particles suggests their auspicious applications in the solid-state lighting and display technology.

Electrical and photoluminescence properties of Sm3+ doped Na0.5La0.5Bi8-xSmxTi7O27 ceramics

In this study, Sm3+ doped Na0.5La0.5Bi8-xSmxTi7O27 (NBT-BITL-xSm, x = 0, 0.01, 0.015, 0.02, and 0.03) ceramics were synthesized via a conventional solid-state reaction process. The structural, electrical, and photoluminescence properties of NBT-BITL-xSm ceramics were systematically investigated. The crystal structure of NBT-BITL-xSm was refined using XRD Rietveld refinement and found to possess a single orthorhombic structure at room temperature. Raman spectroscopy revealed that Sm3+ ions preferred to substitute for Bi3+ located in the A-sites of pseudo-perovskite layers, inducing a slight decrease in orthorhombic distortion. Strong characteristic emission peaks of Sm3+ ions were observed in orange-red regions under a 407nm laser source, and the sample with x = 0.015 achieved the optimal photoluminescent property. Dielectric measurements showed double anomaly permittivity peaks at the temperature of 589 and 600∘C (Tm and Tc, respectively). The complex impedance spectrum indicated that the electrical conductivities mainly originated from crystal grains at high temperature. The activation energy was calculated to be 1.37–1.44eV from Arrhenius fitting results. After Sm3+ substitution, the activation energy for conductivity was increased as a result of reduced oxygen vacancies.

Effect of Li, Na, K cations on photoluminescence of GdAlO3:Eu3+ nanophosphor and study of Li cation on its antimicrobial activity

Alkali metal cations such as Li, Na, K (1mol %) co-doped GdAlO3:Eu3+ (1 mol%) nanophosphors were synthesized by solution combustion technique using oxalyldihydrazide (ODH: C2H6N4O2) as fuel. The structural, morphological, luminescence and antimicrobial activity has been employed to the synthesized nanoparticles. All compounds crystallized in the pure orthorhombic phase with no impurity peak. SEM micrographs showed the agglomerated and irregular shaped particles. The average crystallite size was calculated by William-Hall plots and is found to be in the range 30–40 nm. The characteristic emission peaks of Eu3+ ions were recorded and it is due to 5D0→7FJ (J = 1, 2, 3, 4) transitions. The PL intensity of GdAlO3:Eu3+nano phosphor was improved evidently by alkali metal cation co-doping, due to local distortion of crystal field surrounding the Eu3+ activator. These nanophosphors find potential applications in WLEDs and solid state lighting. Antimicrobial activity of GdAlO3:Eu3+: Li+ nanophosphor against pathogenic microorganisms of both human and plants was carried out by using micro plate dilution technique for bacteria and food poison method for fungi.

A novel red emitting polymeric complex as a directly film-forming phosphor applied in NUV-based LEDs

A novel red emitting polymeric complex poly(styrene-co-glycidyl methacrylate)-Eu(TTA)2(Phen) (PS-co-PGMA-Eu) as a directly film-forming phosphor was synthesized by the technological means of polymerization and subsequent coordination using Eu(TTA)2(Phen) as the complex precursor and poly(styrene-co-glycidyl methacrylate) (PS-co-PGMA) as macromolecular ligand. The synthesized polymeric phosphor can be easily cast into uniform and smooth films. Aside from high thermal stability, this kind of optical material shows a wide-band excitation with the optimum excitation wavelength at 365 nm. Excited by 365 nm UV-light, the intensity of characteristic emission peak at 612 nm of polymer phosphors with different complex content is up to 4 times higher than that of complex. The sensitization effect of the polymer matrix on the luminescent center Eu3+ is discussed in detail. For the polymer phosphor, the concentration of complex could be as high as 7.5 wt % without obvious fluorescence quenching. Furthermore, The polymer phosphor has high quantum yield (67.04%) and long fluorescence lifetime (0.685 ms). Finally, red emitting LEDs fabricated by directly film-forming encapsulation displays better electroluminescent performance (maximum brightness is 12120 cd/m2). In conclusion, PS-co-PGMA-Eu is a promising directly film-forming red emitting polymeric phosphor for NUV-based LEDs.

Synthesis, molecular, electronic structure, linear and non-linear optical and phototransient properties of 8-methyl-1,2-dihydro-4H-chromeno[2,3-b]quinoline-4,6(3H)-dione (MDCQD): Experimental and DFT investigations

Base catalysed ring opening ring closure (RORC) reaction of 6-methylchromone-3‑carbonitrile (1) with 1,3-cyclohexanedione afforded 8-methyl-1,2-dihydro-4H-chromeno[2,3-b]quinoline-4,6(3H)-dione (MDCQD). Theoretical calculations by Density Functional Theory (DFT) at the B3LYP/6-311G (d,p) level of theory was utilized to illustrate the equilibrium geometries of MDCQD. Also, the nonlinear optical properties, simple harmonic vibrational frequencies, thermo-chemical parameters and Mullikan atomic charges were calculated. In addition, the electronic absorption spectra in polar and non polar solvents were discussed on the basis of TD-DFT calculations. A nanofiber-like structure with high aggregation was resolved by using scanning electron microscopy images and its particle sizes were measured by particle size analyzer. The spectroscopic characteristics of the prepared thin film of MDCQD were studied in a wide spectral range of 200–2500nm. The analysis of the absorption edges affords two direct optical band gaps with energies of 1.00 and 2.76eV. A characteristic emission peak of photoluminescence spectrum in the visible region was detected and has a red-shift as a result of solvent polarity. The MDCQD film based heterojunction showed rectification behavior and diode-like characteristics. The photovoltaic characteristics under illumination of 100mW/cm2 were studied. The open-circuit voltage and short-circuit current were found to be 0.22V and 4.25×10−7A/cm2, respectively. Moreover, the prepared heterojunction showed remarkable phototransient characteristics which afford the probability for the operation as a photodiode.

A remote phosphor film of silicate-poly(styrene-co-glycidyl methacrylate) composites for NUV chip-based white LED

Herein we adopt a simple route to prepare silicate phosphor-containing transparent composite film which is able to emit white light on the base of a blue emitting co-polymer matrix poly(styrene-co-glycidyl methacrylate) under excitation of 365 nm. SEM micrographs indicate that the surface treated silicate phosphor particles modified by silane coupling agent and embedded in co-polymer matrix separate from each other with a certain spacing and without agglomeration. More importantly, mutual enhancement in characteristic emission peak of two ingredients is observed. By varying the weigh percentage of silicate phosphor, yellow-to-white photoluminescent color-tuning could be readily accomplished depending on the variation of the intensity ratios between the characteristic yellow emission of silicate phosphor and the blue luminescence of the polymer matrix. And white emission [CIE: (0.354,0.322)] could be obtained from the simultaneous blue and yellow emission (intensity ratios value is 0.93). Simple NUV-based WLEDs were fabricated using prepared silicate phosphor doped composite material, showing Tc of 5917 K, CRI of 84.6. When a larger size composite film was simply assembled with COB, large area white lighting device with a certain color reduction came into being. All the results indicate that the of silicate phosphor-containing transparent composite film has practical significance for the packaging of remote phosphor converted white LEDs.

White light emitting magnesium aluminate nanophosphor: Near ultra violet excited photoluminescence, photometric characteristics and its UV photocatalytic activity

MgAl2O4:Dy3+ (1–11 mol %) nanophosphors (NPs) were synthesized using single step, self ignited solution combustion route at very low temperature and the final product was well characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy and photoluminescence techniques. The bandgap energy (Eg) was estimated using diffuse reflection data and the values were found to be in the range 5.40–6.10 eV. Characteristic emission peaks of Dy3+ ions were recorded between 480 and 680 nm and are ascribed to transitions from 4F9/2 to 6Hj (j=5/2, 13/2 and 11/2) respectively due to 4f-4f transitions of Dy3+ ions upon 354 nm excitation and show good quantum efficiency of ∼66%. The photometric studies revealed that the prepared samples were quite useful for the fabrication of white light emitting diodes. Electrochemical Impedance Spectroscopy (EIS) measurements were performed and found that the reversibility of the electrode reaction, increases the double layer capacitance of the electrode due to reduction in the charge transfer resistance. The synthesized sample exhibited excellent photocatalytic activity towards the degradation of AR-88 dye under UV light. It opens a new window to use this simple method to synthesize multifunctional MgAl2O4 based materials in the area of photocatalysis, display applications as well as for energy storage devices.

Synthesis, DFT band structure calculations, optical and photoelectrical characterizations of the novel 5-hydroxy-4-methoxy-7-oxo-7H-furo[3,2-g]chromene-6-carbonitrile (HMOFCC)

Reaction of 4-methoxy-5-oxo-5H-furo[3,2-g]chromene-6-carboxaldehyde (1) with hydroxylamine hydrochloride resulted in ring transformation producing the novel 5-hydroxy-4-methoxy-7-oxo-7H-furo[3,2-g]chromene-6-carbonitrile (HMOFCC). The structure was deduced based on its correct elemental analysis and spectral data (IR, 1H NMR, 13C NMR and mass spectra). The geometries of the HMOFCC were completely optimized by means of DFT-B3LYP/6-311++G (d,p) theoretical level. The ground state properties such as; total energy, the energy of HOMO and LUMO and Mulliken atomic charges were also determined. In addition, the two solvents; polar (methanol) and nonpolar (dioxane) were utilized to extract the electronic absorption spectra. The assignment of the detected bands was discussed by TD-DFT calculations. A cauliflower-like, as well as, needle-like leaves morphologies were observed using scanning electron microscope images. Two direct optical band gaps were extracted from the photon energy dependence of absorption coefficient at the band edges and found to be 1.16 and 2.56 eV. A characteristic emission peak of photoluminescence spectrum was observed and shifted depending on the solvent type. A remarkable rectification characteristic of HMOFCC/p-Si heterojunction confirms the diode-like behavior. The main important parameters like series resistance, shunt resistance and reverse saturation current show illumination dependence under influence of the illumination intensity range 20–100 mW/cm2. The heterojunction based HMOFCC showed phototransient properties under various illumination intensities which give the recommendation for the studied heterojunction in the field of optoelectronic device application.

Crystal Growth and Luminescence Properties of Dy3+ and Ge4+ Co-Doped Bi4Si3O12 Single Crystals for High Power Warm White LED

Φ1 inch Dy3+ and Ge4+ co-doped bismuth silicate (Bi4Si3O12, BSO) single crystals with the length of 80–100 mm were successfully grown by Bridgman method. They are transparent, free of cracks and inclusions. The white residual at the top parts of BSO crystals disappears with co-doping 1 mol% Dy3+ and more than 3 mol% Ge4+. The FWHM values of X-ray rocking curves shows 1%Dy,3%Ge:BSO crystal possesses high crystallization quality. The intrinsic emission peak of BSO and the characteristic emission peaks of Dy3+ ions are weakened with increasing the doping concentration of Ge4+. 1 mol% Dy3+ and 3 mol% Ge4+ are the optimal concentrations due to high crystallization quality and moderate emission intensity. The CIE coordinates and CCT values shift towards warmer white light region with increased Ge4+ co-doping. The CCT values are close to the ideal value of 3000 K for warm white light when 1%Dy,3%Ge:BSO crystal is excited by various UV light. Increasing the temperature from 298 K to 573 K leads the luminescence lifetime to decrease from 659 μs to 645 μs. More than 95% and 80% photoluminescence intensity at room temperature is still retained at 423 K and 573 K respectively. Dy,Ge:BSO crystals are potential candidates for fabricating high power warm WLEDs.

Citrate-based sol-gel synthesis of blue- and green-emitting BaLa2WO7:Tm3+ or Er3+ phosphors and their luminescence properties

BaLa2WO7:Tm3+ or Er3+ (BLWO:Tm3+ or Er3+) single doped phosphors were prepared by a citrate-based sol-gel method. The crystalline properties of the prepared blue- and green-emitting phosphor materials were analyzed by X-ray diffraction (XRD) after annealing at 1350°C. The XRD patterns of the both phosphors revealed monoclinic structure with a space group of P21/b. The morphological properties and elemental mappings of the BLWO:0.02Tm3+ and BLWO:0.01Er3+ phosphors were measured by field-emission scanning electron microscope images and energy dispersive X-ray spectrum, respectively. The photoluminescence (PL) spectra of BLWO:Tm3+ phosphors showed characteristic emission peaks of Tm3+ ions from the visible blue to near-infrared regions with the dominant emission at 799nm (3H4→3H6) under ultraviolet (UV) and near-UV excitation wavelengths. Similarly, Er3+ ions activated BLWO phosphors exhibited intense green emissions at 548nm (4S3/2→4I15/2) under the characteristic excitation wavelength of 381nm. Furthermore, the temperature-dependent PL emission spectra and the luminescence decay curves were measured for the optimized BLWO:0.02Tm3+ and BLWO:0.01Er3+ phosphors. The chromaticity coordinates for the optimized blue- and green-emitting phosphors were calculated.