Photoluminescence Of Tb3 Research Articles

On the Quenching Mechanism of Ce, Tb Luminescence and Scintillation in Compositionally Disordered (Gd, Y, Yb)3Al2Ga3O12 Garnet Ceramics

Two series of (Gd, Y, Yb)3Al2Ga3O12 quintuple compounds with a garnet structure and solely doped with Ce and Tb were prepared in the form of ceramics by sintering in oxygen at 1600 °C for two hours and studied for the interaction of activator ions with ytterbium ions entering the matrix. It was shown that the photoluminescence and scintillation of Ce3+ ions are completely suppressed, predominantly by tunneling ionization through the charge transfer state (CTS) of the Ce4+-Yb2+ ions. The photoluminescence of Tb3+ ions is quenched in the presence of ytterbium, but not completely due to the poor resonance conditions of Tb3+ intraconfiguration transitions and the CTS of the single Yb3+ and the CTS of Ce4+-Yb2+ ions. The scintillation in the visible range of both Ce3+- and Tb3+-doped samples is intensely quenched as well, which indicates strong competition from Yb3+ ions to activators in interaction with the Gd substrate.

Photoluminescence of Tb3+/Sm3+ ions co-activated in SrO - Na2O - WO3 - tellurite glasses for multicolor laser applications

A novel series of Tb3+, Sm3+ single doped and Tb3+/Sm3+ co-incorporated tungsten tellurite glasses were synthesized by melt quenching technique and corresponding structural as well as luminescence features of the prepared glasses have been reported here. Spectral overlapping between the luminescence spectra of Tb3+ ions and the excitation spectra of Sm3+ ions manifests that the energy transfer process takes place from Tb3+ ions to Sm3+ ions. By using the dual excitations at 377 and 484 nm, the titled co-doped glasses emit green light of wavelength 542 nm along with reddish – orange colour light at 599 nm. In addition to this, there is no possibility of reverse energy transfer which is validated with the help of excitation at 403 nm (Sm3+ ions) as major evidence. The lifetimes of all co-doped glasses decline with increasing Tb3+ doping level in the ligand matrices, indicating the energy migration process takes place from Tb3+→ Sm3+. The chromaticity coordinates of all synthesized co-doped glasses lie in yellowish-orange region of CIE1931 diagram and it shifts to deep yellow region when Tb3+ ion concentration varies. Our findings propose that the titled glasses can be used as visible laser materials for multicolor laser applications.

Growth and study of Tb3+ doped Nb2O5 thin films by radiofrequency magnetron sputtering: Photoluminescence properties

Undoped and doped Nb2O5 thin films were successfully deposited on silicon wafer by sputtering technique from high purity Nb2O5 and Tb4O7 targets and annealed by rapid thermal annealing between 400 °C and 900 °C. Chemical and structural investigations of undoped and Tb-doped Nb2O5 films were made, leading to the determination of stoichiometry and identification of phase transformations with increasing annealing temperature and Tb3+ ion content. The optical properties' analysis (spectrophotometry UV–Vis-NIR, spectroscopic ellipsometry) of those undoped and doped Nb2O5 films led us to the determination of refractive index and electronic properties evolution with annealing temperature and Tb3+ ion content. The structural evolution was confirmed by analysis of Raman spectra of undoped and doped Nb2O5 films. The photoluminescence properties of Tb3+ ion-doped Nb2O5 thin films were also studied. The correlation between the photoluminescence of Tb3+ ion and the electronic properties of the Nb2O5 host matrix is highlighted. The relationship between the structural modifications, the electronic properties of the host matrix, and the photoluminescence of Tb3+ ion is established.

Photoluminescence of Tb3+-doped LiF–BaF2–Lu2O3–Al2O3–SiO2 glasses

LiF–BaF 2 –Lu 2 O 3 –Al 2 O 3 –SiO 2 glasses doped with Tb 3+ ions were obtained by melt–quenching technique, and their transmission and photoluminescence properties were investigated. The X-ray diffraction (XRD) and luminescence decay profiles of these prepared samples have been obtained to confirm their structure and luminescence dynamics. The prepared oxyfluoride glasses doped with Tb 3+ ions exhibit high transmittance in the visible light region, and the UV absorption edge appears red-shifted as the Tb 2 O 3 content increases in the LiF–BaF 2 –Lu 2 O 3 –Al 2 O 3 –SiO 2 oxyfluoride glasses. Under UV excitation, the Tb 3+ ions emissions corresponding to 5 D 3 ( 5 D 4 ) → 7 F J ( J = 6–3) electron transitions can be detected. With the increase of Tb 2 O 3 content, the green light emission intensities caused by the Tb 3+ ions 5 D 4 → 7 F J ( J = 6–3) electron transitions are enhanced, while the blue light emission intensities induced by the Tb 3+ ions 5 D 3 → 7 F J ( J = 6–3) electron transitions first increased to the maximum until the introduction of Tb 2 O 3 was equal to 0.3 mol, and then decreased with the Tb 2 O 3 content further increase. The mechanism involved in the resonance energy transfer (RET) process between Tb 3+ – Tb 3+ ions was explained with an energy level diagram. And the luminescence decay times of Tb 3+ ions electron transition originated from 5 D 4 energy level continue to decrease from 3.171 to 2.250 ms with increasing Tb 2 O 3 content in the LiF–BaF 2 –Lu 2 O 3 –Al 2 O 3 –SiO 2 glasses. • Tb 3+ –doped scintillating glasses. • Intense emission under UV excitation. • Decay time in order of ms from 545 nm emission.

Tb3+离子与SnO2纳米晶体共掺杂SiO2薄膜荧光增强

Tb³⁺离子与SnO₂纳米晶体共掺杂SiO₂薄膜荧光增强

Influence of coating on the photoluminescence of Tb3+ doped ZnSe/ZnS core-shell quantum dots

Tb3+-doped ZnSe and ZnSe/ZnS nanocrystals were synthesized using modified hot-injection method. The observation of the characteristic quantum dots absorption features in a time-gated excitation spectrum was recorded while monitoring Tb3+ emission at 545 nm provided direct evidence for successful incorporation of dopant ions into semiconductor host. Relatively long decay time (∼1.5 ms) of Tb3+ emission indicated that dopant ions were well protected from interaction with surface ligands. Emission properties of core ZnSe:Tb3+ nanocrystals were only slightly modified upon growth of ZnS shell.

Novel color-tunable Gd2O2CN2:Tb3+, Eu3+ phosphors: Characterization and photoluminescence properties

In this paper, color-tunable Gd2O2CN2:Tb3+,Eu3+ phosphors were obtained by co-doping Eu3+ and Tb3+ ions into Gd2O2CN2 host and singly varying the Eu3+ doping concentration. The characteristics of the crystal structure, photoluminescence lifetime and photoluminescence of Tb3+, Eu3+ single-doped and Tb3+ and Eu3+ co-doped Gd2O2CN2, were carefully investigated by XRD, FTIR, PL decay curves and photoluminescence (PL). The results indicated that Tb3+ single-doped Gd2O2CN2 phosphor shows a green emission, and by increasing Eu3+ content, Gd2O2CN2:Tb3+, Eu3+ phosphors emit green to orange and then to red light under the excitation of 379nm.

(Bi0.5Na0.5)TiO3:Tb3+: A New Green Emission Multifunctional Ferroelectric Material

The photoluminescence of Tb3+-doped (Bi0.5Na0.5)TiO3 (BNT) ferroelectric materials fabricated via the conventional solid-sate reaction method were studied. Under blue light excitation (487 nm), a bright green emission centered at 547 nm is observed at room temperature, originating from the 5D4→7F5 transition of Tb3+ ions. The emission intensity reached its maximum as the doping concentration is 0.02 mol and sintering temperature is 1080°C, respectively. The CIE chromaticity coordinate for x = 0.02 is (0.3222, 0.6711), located in the green light region. These results show that Tb3+-doped BNT materials may have potential applications in white light-emitting diodes and novel multifunctional devices.

Synthesis and Photoluminescence of Tb3+-activated Ca3La2 (BO3)4 Phosphor

Phosphor Ca3La2(BO3)4 materials doped with terbium ions were prepared by high temperature solid state reaction method. The structural properties, surface morphology and elemental analysis of terbium doped calcium lanthanum borate phosphors are investigated via X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX). The main diffraction peaks of the orthorhombic structure observed in all the samples. Strong photoluminescence (PL) spectrum was obtained at 543 nm under UV excitation. Emission spectra can be assigned to the emission lines of terbium activators corresponding to 422, 490, 543, 588 and 622 nm attributed to the 5D4→7FJ (J = 2, 3, 4, 5, 6) transitions of Tb3+ ions from a spectral range of 400-750 nm (whole visible spectral region) observed in the PL emission spectrum. PL peak intensity was found to increase with increase in the dopant concentration. These phosphors may provide a new kind of luminescent material for light emitting diodes under UV excitation.

Structure, surface analysis, photoluminescent properties and decay characteristics of Tb3+-Eu3+ co-activated Sr2MgSi2O7 phosphor

Tb3+-Eu3+ co-activated Sr2MgSi2O7 powder phosphors were synthesized by a solid-state reaction method. The structure, stretching vibrations, chemical and electronic states, and photoluminescent properties were studied using X-ray powder diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), Time-of-flight secondary ion mass spectrometer (TOF-SIMS) and Photoluminescence (PL) spectroscopy respectively. The XRD pattern of the Sr2MgSi2O7:Eu3+, Tb3+ phosphor resembles the standard tetragonal phase of Sr2MgSi2O7. The fitted XPS data demonstrated that there were two different Sr2+ sites in the host lattice and a site occupied by Mg+ cations which connects the Sr+ sites with the Si+ ions. The TOF-SIMS results demonstrated localization and distribution of various ions within the host lattice (Sr2MgSiO7) including the Tb3+ and Eu3+ dopants. The photoluminescence of Tb3+ single doped Sr2MgSi2O7 shown to emit blue and green emissions simultaneously with green emission more intense and the blue emission improving considerably when lower concentrations of Tb3+ were used. Only red emission was observed from the Eu3+ single doped Sr2MgSi2O7. Upon Tb3+-Eu3+ co-doping, simultaneous emissions of blue, green and red lines were observed resulting in white emission.

Study of laser ablated copper nanoparticles in different liquids and their effect on optical properties of Tb3+ in PVA

Cu nanoparticles have been prepared in different liquids i.e. aqueous solution of sodium dodecyl sulfate, acetone and ethanol with the help of laser ablation from a bulk copper target using 1,064 nm from Nd:YAG laser. Transmission electron microscopy and UV–vis spectrometry have been employed for the analysis of size and optical properties of the nanoparticles, respectively. X-ray diffraction patterns confirm the formation of Cu nanoparticles. The nanoparticles exhibit hexagonal nature with average particle size of 15–25 and 20–30 nm in case of sodium dodecyl sulfate and acetone respectively, whereas they posses spherical symmetry with bigger particle size of 30–40 nm in ethanol. The surface plasmon resonance peak shifts from 587 to 613 nm in different solvents, which is partly related to the change in shape and size of the particles. Further, Cu nanoparticles in different solvents have been added to polymer with terbium (Tb3+) ions to seek into the optical properties of the samples. The photoluminescence of Tb3+ ions varies with Cu nanoparticles in different solvents in polyvinyl alcohol and the result has been further verified by lifetime analysis.

Combustion synthesis and photoluminescence of Tb3+ doped LaAlO3 nanophosphors

Terbium doped lanthanum aluminate (LaAlO3) nanophosphors were successfully synthesized by a combustion process using concentrated solution of lanthanum nitrates and aluminate as oxidiser, and glycine acid as fuel. The powders were characterized by infrared spectroscopy (IR), X-ray diffraction (XRD), Rietveld refinement, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and fluorescence spectroscopy. Pure LaAlO3 phase was obtained at 800°C heated for 4h, without formation of any intermediate phase, with an average crystal size, as determined by TEM, of 60nm. Intense green emission is reported at 542nm, from the 5D4 level, which intensity depends on Tb concentration.

Photoluminescence properties of PVP/Tb(TTA)2(Ph3PO)2NO3 nanocomposites

Thin films (1–10μm thickness) of nanocomposites (NCs) based on a coordinated compound (CC) Tb(TTA)2(Ph3PO)2NO3 (where TTA is thenoyltrifluoroacetonate (C8H5F3O2S), and Ph3PO is triphenylphosphine oxide) and a polymer — polyvinylpyrrolidone (PVP) ((C6H9NO)n) were obtained by chemical methods. NCs were characterized by measurements of optical transmission, and photoluminescence (PL) at different concentrations of CC in NCs. Using the optical transmission spectra, the characteristic parameters of NCs such as the threshold of absorbance versus the concentration of the CC in NCs were determined. A slight displacement of the absorption threshold to the infrared region was observed with increasing concentration of coordinated material in NCs. It was established that the excitation spectrum at which the photoluminescence (PL) in NCs takes place covers the range of wavelengths from 200 to 410nm. The PL of nanocomposites was detected as specific for internal transitions 4f→4f of the Tb3+ ion 5D4→7Fi (i=6, 5, 4 and 3) centred at 488, 543, 589 and 614nm, respectively at T=300K. The dominant PL was observed at 543nm and its half-width is less than 10nm. The intensity of the photoluminescence signal at 543nm in the case of the NC films is 2 times higher than the intensity of the PL of Tb(TTA)2(Ph3PO)2NO3 powders at equal conditions of excitation. The PL intensity of the NCs at 77K has grown more than 20 times compared with that at 300K.

Upconversion Photoluminescence of Tb3+Yb3+-codoped Germano-tellurite Glasses

Upconversion Photoluminescence of Tb3+Yb3+-codoped Germano-tellurite Glasses

Synthesis and photoluminescence of Tb3+ Activated NaY(WO4)2 phosphors

The novel yellowish green phosphor powders of NaY(WO4)2 doped with Tb3+ were prepared by solid-state reaction. The powder samples were characterized by X-ray diffraction and photoluminescence. X-ray diffraction analysis showed that the phosphors sintered at 900°C for 6h were a pure NaY(WO4)2 phase for all the Tb3+ doping concentrations. The room temperature excitation spectra vary with the Tb3+ concentration and consist of an intense charge transfer band of WO42− group and weak intra-4f8 transition absorption peaks of Tb3+ ions. The photoluminescence spectra, excited at the peak wavelengths of charge transfer bands, consist of the characteristic Tb3+ emission transitions from 5D3 and 5D4 excited levels to 7FJ (J=3–6) levels. The dependence of luminescence intensity on the Tb3+ concentration in NaY(WO4)2:Tb phosphors was investigated.

Multibubble sonoluminescence of Tb3+ ion in aqueous solutions of dimethyl sulfoxide

The intensity and spectra of multibubble sonoluminescence of TbCl3 solutions in water-DMSO mixtures saturated with air and argon are studied. The spectra represent the superposition of the characteristic glow of Tb3+ ions and the continuum of emission of electronically excited products of solvent sonolysis (with H2O*, OH*, and SO2* as main emitters). Abnormal action of DMSO and sulfur dioxide on the characteristic luminescence of Tb3+ ions during sonolysis of aqueous solutions is revealed. These additives enhance the sonoluminescence of water to different extent, quench the sonoluminescence of Tb3+, and differently influence the photoluminescence quantum yield of this ion (DMSO acts as activator, whereas SO2 acts as quencher). Sulfur dioxide quenches the sonoluminescence of Tb3+ much more efficiently than the photoluminescence of Tb3+. The abnormal effect of DMSO on sonoluminescence is most probably due to the quenching action of sulfur dioxide formed during sonolysis of DMSO on Tb3+* ions in cavitation bubbles.

Crystal structure and photoluminescence of Tb 3+-activated Ba 3InB 3O 9

Subsolidus phase equilibrium of BaO–In 2O 3–B 2O 3 system has been investigated mainly by solid-state reaction technique and powder X-ray diffraction method. There are 15 definite three-phase regions under present experimental conditions. Two ternary compounds, Ba 3InB 9O 18 and Ba 3InB 3O 9 were found and confirmed in this system. Crystal structure of Ba 3InB 3O 9 was determined from X-ray powder diffraction data using Rietveld method. It crystallizes in space group R 3 ¯ with six formula units of a cell with a = 12.7713(4) Å, c = 9.3950(2) Å and V = 1327.09(8) Å 3. Coordination surrounding of B–O in this structure, [BO 3] 3− group, was confirmed by infrared absorption spectrum of Ba 3InB 3O 9. Ba 3In 1− x Tb x B 3O 9 ( x = 0.1–0.5) phosphors exhibited green emission at about 543 nm with 370 nm light excited. There is neither emission from 5D 3 level nor concentration quenching observed in the case of Ba 3InB 3O 9:Tb 3+, which can be explained from the crystal structural features of the matrix Ba 3InB 3O 9. Chemical stabilization, simple preparation, and luminescence characteristics make phosphors Ba 3InB 3O 9:Tb 3+ have potential applications in white light-emitting diodes.

Photoluminescence of Tb 3+ and Mn 2+ activated Ca 8MgGd(PO 4) 7 under vacuum ultraviolet excitation

Novel Tb 3+ and Mn 2+ activated Ca 8MgGd(PO 4) 7 phosphors were synthesized by solid-state reaction and their photoluminescence properties in vacuum ultraviolet region were investigated for the first time. It can be observed from the excitation spectra that the host-related absorption band is located around 170 nm, and it overlaps the O 2− → Tb 3+ charge transfer band of Ca 8MgGd(PO 4) 7:Tb 3+ around 161 nm and the 3d 5 → 3d 44s transition band of Ca 8MgGd(PO 4) 7:Mn 2+ near 200 nm. The 4f–4f 5d spin-allowed and spin-forbidden transitions of Tb 3+ are verified to be located at 170–250 and 257–271 nm, respectively. Upon 147 nm excitation, the dominant emission peak intensity of the Ca 8MgGd 0.1(PO 4) 7:0.9Tb 3+ phosphor is about 2.7 times stronger than that of the commercial Zn 2SiO 4:Mn 2+ green phosphor, and the brightness of the former with a short decay time of 2.5 ms is about 98% of the latter’s. The Ca 8MgGd(PO 4):Mn 2+ phosphor excited at 147 nm exhibits a deep red emission around 650 nm, which could be attributed to the 4T 1 → 6A 1 transition of Mn 2+, with the CIE index (0.679, 0.321). In a word, the results above indicate that both Tb 3+ and Mn 2+ activated Ca 8MgGd(PO 4) 7 phosphors could be promising for PDP or Hg-free lamp applications.

Photoluminescence of Tb 3+/Ce 3+ co-doped aluminum oxynitride powders

Aluminum oxynitride(AlON) phosphors co-doped by Tb 3+ and Ce 3+ were synthesized by nitridation of the precursor which was co-precipitated from Al(NO 3) 3 solution and nanosized carbon black at 1750 °C for 2 "hrs" in flowing nitrogen atmosphere. The obtained AlON based powders were composed of polycrystalline spinel typed particles with sizes in the range of 1–3 μm. Under an excitation of 275 nm, it was found that co-doping of Ce 3+ could drastically enhance the luminescence of AlON:Tb 3+ powder by energy transfer. The product with 0.5 mol% Ce 3+ and 0.67 mol% Tb 3+ exhibited a strong broad green emission at 540 nm. The critical quenching concentration of Tb 3+ in AlON:0.5 mol% Ce 3+/xmol% Tb 3+ phosphor was determined to be 0.67 mol%. It was supposed that the mechanism of concentration quenching of Tb 3+ in AlON:0.5 mol% Ce 3+ xmol% Tb 3+ phosphor was dipole–dipole interaction.

Luminescent properties of Tb 3+ activated GdTaO 4 with M and M′ type structure under UV–VUV excitation

The photoluminescence of Tb 3+ doped M and M′ type gadolinium orthotantalate Gd 1− x Tb x TaO 4 (0.01≤ x≤0.20) was investigated under ultraviolet and vacuum ultraviolet excitation. For the samples of Gd 1− x Tb x TaO 4 with different crystallographic structures, emission spectra were the same in addition to intensity; the optimal concentration for Tb 3+ was about 10 mol % in M type Gd 1− x Tb x TaO 4 but 5 mol % in M′ type Gd 1− x Tb x TaO 4. These differences could be corresponding with the difference in structures. In addition, compared to commercial Zn 2SiO 4: Mn 2+, the integrated intensity of M and M′ type GdTaO 4: Tb 3+ could reach 67% and 85%, respectively, of that at 147 nm excitation, which indicates that GdTaO 4: Tb 3+ would be a promising vacuum ultraviolet phosphor for application in PDP and Hg-free lamp.