Judd-Ofelt Intensity Parameters Research Articles

Judd-Ofelt analysis of some novel Eu3+ complexes featuring Kojic acid and N, N’- donor ligands

Three ternary complexes featuring Eu3+ have been prepared by using primary ligand Kojic acid and secondary ligands 4-methyl-110-phenanthroline; 3,4,7,8-tetramethyl-110-phenanthroline and bathocuproine. Characterization of synthesized complexes was carried out using spectroscopic techniques: FTIR, elemental analysis, ESI-MS+, UV, TGA, FESEM, P-XRD, and Photoluminescence studies (PL). Results of P-XRD revealed that the complexes possess crystalline nature. Four specific emission peaks of Eu3+ have been noticed, corresponding to 5D0 → 7FJ transitions, where J = 0–3 at about 580, 595, 614, and 650 nm, respectively. The Judd-Ofelt intensity parameters, radiative lifetime, quantum efficiency, branching ratio, and stimulated emission of complexes were determined. The CIE color coordinates revealed monochromatic red emission by the complexes with high color purity. The higher values of stimulated emission cross-sections and branching ratios of the complexes show that these complexes might be potentially applicable in laser systems. The CCT values below 5000 K suggest warm light emission by the complexes. The prepared ternary Eu3+ complexes have higher thermal stability of about 250 °C. Based on the result obtained from the above studies, these complexes could be a promising candidate for laser systems, optical applications, OLEDs, display devices, photophysical, and biomedical science.

Growth, spectroscopic features and efficient 2 μm continuous-wave laser output of a Tm3+: Gd0.1Y0.9AlO3 disordered crystal

Tm3+-doped Gd0.1Y0.9AlO3 (GYAP) disordered crystal with size of Φ (28–35) mm × (50–70) mm was grown successfully by the Czochralski method. The X-ray powder diffraction, polarized absorption spectra, and polarized luminescence spectra of Tm3+: GYAP crystal were measured to investigate the structural and luminescent properties of the crystal. The cell parameters of Tm3+: GYAP crystal were found to be a = 5.321 Å, b = 7.371 Å, and c = 5.176 Å, respectively. The spectral parameters such as line strengths, Judd-Ofelt (J-O) intensity parameters Ω2,4,6, the radiative transition rates, the branching ratios, and the radiative lifetimes were calculated based on the J-O theory. The absorption cross-sections were determined to be 0.47 × 10−20 cm2 (at 797 nm), 0.55 × 10−20 cm2 (at 777 nm), and 0.41 × 10−20 cm2 (at 794 nm), respectively. The Tm3+: GYAP crystal, as far as we know, was firstly used for laser demonstration with a 793 nm laser diode (LD). The slope efficiency up to 6.4% was achieved with maximum output power of 426 mW at 1941.953 nm. The resulting linear polarized and stable laser output indicate that the Tm3+: GYAP disordered crystal can be applied to achieving tunable and ultra-short laser at ~2 μm.

Structural and luminescent properties of Eu-ion-doped CaHfO3

We investigated the structural and luminescent properties of Eu3+-doped CaHfO3, which was synthesized using the solid-state reaction method. The crystal structures of the samples were analyzed by applying the Rietveld refinement technique on their X-ray diffraction patterns. Because of cation vacancies and/or interstitial oxygens, the unit-cell volumes of the samples increased, and the local lattice distortions were alleviated when the Eu3+ concentration increased. For near-ultraviolet photoexcitation, the emission spectra of our samples showed a series of narrow bands, which were assigned to the energy transitions of 5D0 → 7FJ (J = 0, 1, 2, 3, and 4) in the Eu3+ ions. The luminescence behaviors of the samples were evaluated using Judd–Ofelt intensity parameters, which provided useful information regarding the local structure around the Eu3+ ions.

Spectroscopic characteristics of Dy3+ impurities–doped borate-based glasses: Judd–Ofelt calculation

Using the melt-quenching method, Dy3+-doped lithium-strontium-zinc-borate glasses of composition 20Li2O–5SrO–5ZnO–(70-x)B2O3–xDy2O3 (0≤x≤1.25 mol%) were prepared and characterised using various tools. The Dy3+ contents dependent spectroscopic traits of these glasses were determined to identify their white light-emitting potential. The Judd-Ofelt (JO) evaluation was made to validate the experimentally measured optical properties. The XRD patterns of the as-quenched samples revealed their glassy nature and the FTIR spectra exhibited the presence of BO3 and BO4 functional groups. The absorption spectra of the samples showed twelve characteristic bands of Dy3+ wherein the hypersensitive one occurred at 1270 nm. The JO intensity parameters revealed a changing trend from Ω2>Ω4>Ω6 to Ω2>Ω6>Ω4, indicating the effectiveness of Dy3+ doping. The photoluminescence emission spectra of the glasses exhibited the three significant peaks (intense blue, intense yellow and weak red) with concentration quenching beyond 1 mol% of Dy3+. The radiative parameters of 4F9/2 → 6H13/2 transition disclosed the highest branching ratio (≥85%), radiative transition probability of 504–1711 s−1, stimulated emission cross-section from 28.70×10−22−19.01×10−22cm2, optical bandwidth of 1.34×10−20−4.63×10−20cm3 and optical gain of ~ 14.5×10−25cm2s, suggesting optical energy harnessing potential of the proposed glass composition which are useful in low threshold and efficient lasers and amplifiers design. The quantum efficiency of the glasses was ranged from 34–84%. The 1931 CIE analyses of the samples disclosed the colour coordinates appearance very close to the pure white (within 1–10%) with colour purities ranged from 11.6 to 4.8%, and the estimated values of CCT were above 5300 K, indicating their potency for the cool white light emission.

Spectroscopic properties of the gamma irradiated ErF3-DOPED BaF2 crystals

The spectroscopic properties of the gamma irradiated BaF2:Er3+ crystals were studied. BaF2:0.2 mol% ErF3 crystal was grown using the vertical Bridgman method. The Judd-Ofelt intensity parameters, Ωt (t = 2,4,6) for f-f transitions of Er3+ ions were determined from optical absorption spectra recorded before and after gamma irradiation at various doses. The influence of gamma irradiation dose on the Judd-Ofelt parameters and on the radiative transition probability, on the branching ration and on the radiative lifetime was also investigated. The predicted radiative lifetimes were compared with those measured and with those reported by other authors. Apart from the green and red emissions, arising under excitation at 378 nm, a new UV emission band around 321 nm was observed under excitation at 290 nm. This emission was not reported before. Using the Füchtbauer-Ladenburg method, the emission cross section and optical gain parameter of the red and green emission band were calculated.

Titania nanoparticles embedded Er3+-Sm3+ co-doped sulfophosphate glass: Judd-Ofelt parameters and spectroscopic properties enhancement

The conventional melt quenching method was used to synthesis erbium and samarium ions co-doped sulfophosphate glasses containing TiO2 nanoparticles with the molar compositions of (58.0-x)P2O5-20.0MgO-20.0ZnSO4-1.0Sm2O3-1.0Er2O3-xTiO2 with x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0 mol%. The X-ray diffraction (XRD) technique was applied to verify that the nature of fabricated glass samples is of amorphous type. Judd-Ofelt (JO) intensity (Ωi) parameters were determined through spectral data provided in the investigations conducted on the optical absorption. The applied JO parameterization illustrates the covalency related to rare-earth (RE) ions and ligands. For some given lasing levels, the radiative parameters were estimated including branching ratios (βR), radiative lifetimes (τR), and radiative transition probabilities (A). The photoluminescence spectra provided in some studies are used to evaluate the stimulated emission cross-sections (σpE) for some important lasing transitions including 4G5/2→6H5/2, 4G5/2→6H7/2, and 4G5/2→6H9/2. The determined radiative parameters are potential options as a candidate for lasing.

Transition intensity analysis and emission properties of Eu3+: Bi2ZnOB2O6 acentric biaxial single crystal

Optical absorption, excitation and emission spectra of trivalent europium (Eu3+) ions in Bi2ZnOB2O6 nonlinear single crystal obtained by the Kyropoulos method were investigated. Strong, orange-red emissions of Eu3+ centered at 592 and 615 nm originate mainly from the 5D0 →7F1 and 7F2 transitions, respectively. Judd-Ofelt intensity parameters for f-f transitions were derived from the room temperature (300 K) emission spectra and were used to calculate the radiative transition rates (AR), lifetimes (τR) and branching ratios β for 5D0 excited state of Eu3+. The calculated values of τR and β were compared with the measured values for 5D0 level. The 5D0 fluorescence decay in 0.5 %Eu3+:Bi2ZnOB2O6 was exponential with time constant of 1.1 ms at room temperature. The stimulated emission cross-sections σ were also evaluated for the 5D0 → 7FJ transitions for the first time in this system. We also report on laser site selective spectroscopy of a Eu3+: Bi2ZnOB2O6 confirming the Eu3+ distribution into two sites. The site assignments of Eu3+ ions were discussed on the base of both optical spectroscopy results and structural analysis.

Spectroscopic study and energy transfer behavior of Gd3+ to Dy3+ for Li2O–MgO-Gd2O3–B2O3–Dy2O3 glasses for white emission material

The present study reports the Gd3+-sensitized Dy3+ luminescence and energy-transfer phenomenon, occurring in (B2O3)0.55-x (Li2O) 0.30(MgO)0.10(Gd2O3)0.05 (Dy2O3)x glasses, quenched by high-temperature melting. We study the Judd-Ofelt (JO) intensity parameters and radiative properties, determined by the absorption and emission spectra. The photoluminescence excitation of the Dy3+ at λem = 575 nm shows the existence of Gd3+ peaks (275 nm and 312 nm) while the emission spectra of the glasses reveal that among the four observed Dy3+ characteristics emissions (482 nm, 575 nm, 663 nm and 753 nm), only the λem = 575 nm enhances due to the excitation of the 4f7 state of the Gd3+ at λexc = 275 nm, an indicative of the effective energy transfer (ET) from the Gd3+ to the 4f-4f electric-dipole transition of the Dy3+. The ET predicts the sensitizer's luminescence decay and activator's luminescence growth, given the fact that an efficient yellow luminescence originates from the activtor's emitting centers. We determine the key parameters such as energy transfer efficiencies, transfer probabilities and average donor–acceptor distance by measuring the lifetimes from the sensitizer Gd3+ ions (λexc = 275 nm and λem = 312 nm) and the activator Dy3+ ions (λexc = 388 nm and λem = 575 nm). In addition, by using the Inokuti –Hirayama (IH) model, we find that the nature of the mechanism of the energy transfer between the Gd3+ and Dy3+ ions is predominantly the non-radiative phonon-assisted electric dipole–dipole. Lifetime of the samples decreases with increasing Dy3+ content (λexc = 388 nm and λem = 575 nm) which shows the resonance energy transfer (RET) within the Dy3+. This proposes that the luminescence and the energy transfer between the Gd3+ and the Dy3+ can be boosted up in the host glass, crucial for the persistent luminescence and spectral conversion/modification. The CIE color coordinates and CCT suggest that the present glasses are useful for white-light emission.

Effect of Ag nanoparticles on the Judd–Ofelt and radiative parameters of Sm[formula omitted] ions in sol–gel silica matrix

Sm3+ singly doped and Sm3+ co-doped with varying concentrations of silver nanoparticles (Ag NPs) in silica matrix were fabricated via sol–gel route and investigated by structural and spectroscopic techniques. Structural characterizations were done by XRD, EDX and TEM techniques. The XRD and TEM studies reveal the presence of nanosized Ag particles in the amorphous silica matrix whereas EDX confirms the atomic percentage of Sm and Ag respectively as 1.43 and 0.08 in the present matrix. Spectroscopic studies were performed through UV–visible absorption, excitation, emission and time co-related photoluminescence decay spectra of the fabricated samples. The dependence of Judd–Ofelt intensity parameters and the radiative parameters of Sm3+ on the concentration of Ag NPs in the studied matrix were evaluated. Significantly higher value of Ω2 obtained for the present system reveals effective network modifying nature of the Ag NPs as well as the effectiveness of the silica host. The photoluminescence behavior shows strong dependence on the concentration of Ag NPs and possesses highest intensity and yield for Ag concentration of 0.03 wt%. The emission transition 4G5∕2→6H9∕2 of Sm3+ corresponding to the red color observed at 640 nm for the present silica matrix shows excellent radiative behavior compared to other popular hosts. The radiative behavior is explained in terms of LSPR phenomena, network modifying role of Ag NPs and energy transfer between Sm3+ ions and Ag NPs.

Effect of the phosphate content on the spectroscopic and lasing properties of Er3+/Yb3+-doped fluorophosphate glasses

The influence of phosphate content on the formation and luminescent properties of Er3+/Yb3+-doped fluorophosphate glass has been studied. Using the Judd-Ofelt theory the phenomenological intensity parameters Ωt (t = 2; 4; 6) were obtained. The change of Judd-Ofelt parameters indicates minor differences in Er3+environment with increase in the phosphates content up to 10 mol.%. It was shown that in the studied fluorophosphates glasses erbium ions remain in the fluoride environment. The increase in phosphate content leads to lifetime change of erbium laser level from 9.4 ms to 7.8 ms. Using the Judd-Ofelt intensity parameters Ωt the stimulated emission cross-section of the 4I13/2→4I15/2 transition has been calculated. The gain shape of the glasses with lower (2–10 mol. %) phosphate content has been found to be smoother than for phosphate glasses with 20 mol.% Ba(PO3)2, which makes former very attractive gain material.

K2YF5:Tb3+ single crystal: An in-depth study of spectroscopic properties, energy transfer and quantum cutting

Tb3+ doped K2YF5 single crystal was synthesized by the hydrothermal technique. Structure of material was analyzed by X-ray diffraction pattern and Raman spectra. The optical properties were studied through absorption, luminescence spectra and decay curves. Absorption spectra were used to calculate the bonding parameter (δ) and Judd-Ofelt intensity parameters (Ω2,4,6). The JO parameters and emission spectra have been used to estimate radiative properties such as transition probability (AR), branching ratios (βcal, βexp), lifetime (τcal) stimulated emission cross-sections (σλp, 10−22 cm2) and optical gain (σλp × τcal, 10−25 cm2 s) for 5D3→7FJ and 5D4→7FJ (J = 0 ÷ 6) transitions. The dominant interaction mechanism and energy transfer parameters between Tb3+ ions have been found by fitting the decay curves of 5D3 level to the Inokuti-Hirayama model. In addition, the quantum cutting process based on energy transfer between Tb3+ ions has also been studied for K2YF5:Tb3+ crystal.

Bright NIR-luminescent [formula omitted] complexes with pyrazole-substituted 1,3-diketones demonstrated an unusual spectral lines branching ratios

A series of novel highly NIR-emitting Nd3+ complexes with specially designed 1,3-diketones bearing a pyrazole moiety and a linear CxF2x+1 group (x=1,3,6) was obtained and exhaustively investigated. It was demonstrated that for the complexes with an increased number of fluorine atoms, the triplet level energy of the ligands is decreased and phonon relaxation processes are suppressed. This provides a remarkable increase in the photoluminescence quantum yield up to 1.1%, which is close to the highest values reported for Nd3+ complexes with 1,3-diketones. The photoluminescence spectra of the complexes exhibited the Stark splitting indicative of non-cubic symmetry. Low symmetry of coordination environment was confirmed by the X-ray structural data and analysis of calculated Judd–Ofelt intensity parameters. Besides, it was revealed that the most intense band in the PL spectrum is attributed to the 4F3∕2→4I9∕2 transition (at 880 nm) which is commonly rather weak for simple diketonate complexes. The calculations showed that the unexpectedly high branching ratio of the 4F3∕2→4I9∕2 transition raises with elongation of the fluorinated chain and reaches 59% for the complex with x=6. The studies were conducted for solutions of the complexes as well as for solid samples, and the corresponding changes in their optical behavior were discussed. Uncommon properties of the synthesized Nd3+ complexes make them promising materials for various state-of-the-art luminescent applications, e.g., luminescent markers with an unusual spectral intensity distribution. Based on the electroluminescence studies, we also estimated the potential of the complexes for purely NIR-emitting OLEDs fabrication.

The influence of Eu3+ doping on the studies of luminescent properties and quantum efficiency of ZnWO4 phosphor

ZnWO4:Eu3+ red nanophosphors have been synthesized by a simple environmentally friendly and low-cost molten salt method. The phase structure, morphology, SAED, photo-luminescent (PL), lifetime, color rendering, quantum efficiency and stability properties of the phosphor were investigated in detail. The XRD results indicated that all Eu3+ ions doping ZnWO4 samples crystallize in a single crystal wolframite structure and exhibit superior crystallinity. Under the excitation of 394 and 465 nm, ZnWO4:Eu3+ phosphors can be exhibited red light emission. The photoluminescence excitation spectra of ZnWO4:Eu3+ phosphors show several emission peaks, on account of the f–f transitions of Eu3+ ions. The quantum efficiency of ZnWO4:0.07Eu3+ phosphors were calculated to be 40.5%, the CIE chromaticity coordinate of ZnWO4:0.07Eu3+ phosphors were (0.631, 0.364) closed to the red phosphors standard value (0.670, 0.330), based on the Judd–Ofelt analysis, Judd–Ofelt intensity parameters (Ω2/Ω4) includes symmetry of Eu3+ ions crystal field environment, it was suggested that ZnWO4:0.07Eu3+ phosphors were a potential phosphor in LEDs. This research sheds new light on improving the quantum efficiency, stability properties and CIE chromaticity coordinate.

Spectroscopic properties of Sm3+ and CdS co-doped in sol-gel silica glass

Sm 3+ - doped silica glass co-doped with CdS nanoparticles have been prepared by sol-gel method. FTIR spectra of the samples at different annealing temperatures show the gradual removal of hydroxyl group. XRD pattern shows crystalline nature of the silica host along with CdS peak. The optical absorption and fluorescence properties have been investigated using Judd-Ofelt theory. The Judd-Ofelt intensity parameters have been obtained from the absorption spectrum following the trend Ω 2 > Ω 4 > Ω 6 and the large value of Ω 2 indicates covalency of the rare earth bonding. Under excitation with 370 nm, photoluminescence peaks have been observed in the green, yellow, orange and red region as a result of radiative relaxation from the 4 G 5/2 state.

Spectroscopic and luminescent properties of the lithium tetraborate glass co-doped with Tm and Ag

Spectroscopic properties of the Tm3+ (4f12, 3H6) ions in Tm-doped and Tm–Ag co-doped glasses with Li2B4O7 (or Li2O–2B2O3) basic composition are studied. All investigated glasses show intense blue, red, and infrared emission bands of the Tm3+ ions. Experimental and theoretical oscillator strengths (fexp and fcal), Judd–Ofelt intensity parameters (Ω2, Ω4, Ω6) and radiative properties such as probabilities of radiative transition (Arad), branching ratios (β), radiative lifetimes (τrad), and quantum efficiencies (η) of the Tm3+ luminescence in the Li2B4O7:Tm and Li2B4O7:Tm,Ag were calculated. Presence of the Ag0 (4d105s1, 2S1/2) and Ag2+ (4d9, 2D5/2) paramagnetic centres and their aggregates in the Li2B4O7:Tm,Ag glass was confirmed by electron paramagnetic resonance. Luminescence spectra and decay kinetics of the Ag+ (4d10, 1S0) ions and small non-plasmonic Ag aggregates were registered and discussed. Increasing of quantum efficiency and yield of the Tm3+ luminescence in the Li2B4O7:Tm,Ag glass is explained by energy transfer from Ag species to the Tm3+ ions.

Energy transfer and luminescent properties of Eu3+, Tb3+, Eu3+-Yb3+and Tb3+-Yb3+ doped α-NaYF4 nanophosphors prepared by coprecipitation route

Cubic α-NaYF4 nanometer-sized crystals doped with Eu3+, Tb3+, Yb3+-Eu3+ or Yb3+-Tb3+ were synthesized by an original coprecipitation route. The obtained nanoparticles exhibited primary particles showing cubic shape with sizes ranging between 35 and 65 nm. The singly- or co-doped nanophosphors exhibited strong red (Eu3+) or green (Tb3+) fluorescence upon ultraviolet (UV) or near infrared (NIR) excitation, which resulted respectively from down- or up-conversion processes occurring in their structure. Spectroscopic properties were investigated on the basis of emission spectra as well as luminescence decays. From the emission spectra of Eu3+ doped samples, the Ω2 and Ω4 Judd-Ofelt intensity parameters were calculated. The concentration quenching of the Eu3+ or Tb3+ ion emissions in singly-doped or Yb3+ co-doped α-NaYF4 were ascribed to resonant cross-relaxations. The main derived interaction between the active ions was evidenced as an electric dipole-dipole one through fitting the decays curves with the Inokuti-Hirayama model. The critical distances and energy transfer microparameters for the transfer processes were given showing very short range interaction. The dependence of integral up-conversion intensity on the NIR energy of the beam power was measured. The results indicated a two-photon process based on a cooperative energy transfer.

~2 μm emission properties and energy transfer processes in Tm3+ doped Bi2O3-GeO2-Na2O glass laser material

Tm3+ doped Bi2O3-GeO2-Na2O glass samples were synthesized by conventional melt-quenching method. The Raman spectra measurements showed the maximum phonon energy of prepared glass is 794 cm−1, which is considerably lower than silicate glasses. Based on the measured absorption spectra, Judd-Ofelt intensity parameters, spontaneous radiative transition probabilities and radiative lifetimes were calculated to elucidate the radiative properties of Tm3+ in the presented glass. Intense near infrared emission around ~2 μm was obtained under the pump of 808 nm laser diode. A large stimulated emission cross section (5.51 × 10−21 cm2 at 1851 nm) of Tm3+: 3F4 → 3H6 was achieved in the prepared bismuth germanate glass doped with 1 mol% Tm2O3. Besides, the energy transfer processes among Tm3+ were analyzed using the extended overlap integral method. These results indicate that the presented glass is a promising candidate for ~2 μm laser applications.

Ba5Zn4Gd8O21:Tb3+—structural characterization and the Judd-Ofelt parameterization from emission spectra

Ba5Zn4Gd8O21:Tb3+ nanorods; synthesized via solution combustion route; were found to crystallize in the tetragonal (I4/m, 87) crystal system. The UV excitation at 290 nm of all Ba5Zn4Gd8O21:Tb3+ samples yielded the characteristics emission corresponding to 5D4 → 7F6,5,4,3 transitions in Tb3+ activator (used for Judd-Ofelt analysis). A detailed investigation of photoluminescence decay curves and emission spectra of Ba5Zn4Gd8O21:Tb3+ nanorods provided the radiative lifetime (1.0889 ms) and total radiative transition rates from 5D4 state in Tb3+ ion. The electric-dipole radiative transition probabilities (extracted from total radiative rates i.e. electric-dipole + magnetic-dipole) were used to calculate the Judd–Ofelt intensity parameters (Ω2 = 4.76 × 10−20, Ω4 = 2.11 × 10−20 and Ω6 = 2.00 × 10−20 cm2). The very high quantum efficiency of 5D4 state (81%) suggests their potential use in lighting and display devices. Finally, a large magnitude of peak stimulated emission cross section of 5D4 → 7F5 (16.5838 × 10−20 cm2) transition also claims their promising candidature as a good laser material.

Enhanced red luminescent PBTNAEu glasses for solid state lasers

The luminescence characteristics of Eu3+ activated 30 PbO+(50–x) B2O3+5 TeO2+10 NaF+5 AlF3+x EuF3 (PBTNAEu) glasses prepared by melt-quenching process were studied for red laser applications. The phonon-side band mechanism of Eu3+: 5D2 emission state was discussed with the help of photoluminescence excitation and the Raman spectral features. The Judd-Ofelt intensity parameters that will be used to evaluate various laser characteristic parameters were determined from both the absorption and the emission spectra. The absorption from 7F0 ground and 7F1 first excited states was considered by applying the thermal correction. The emission spectra were used to study the luminescence enhancement and the asymmetric environment around the Eu3+ ions. The quantum efficiency of emitted luminescence was determined from the experimental and radiative decay times of 5D0 emission state. From the experimental results, it was suggested that the PBTNAEu glass containing 2.0 mol% of EuF3 has more potentiality for red laser applications.

Growth and red-orange emission of Sm3+ doped SrAl12O19 single crystals

Sm:SrAl12O19 (Sm:SRA) single crystals with dopant concentration of 1 and 8 at.% have been successfully grown by the Czochralski method. Polarized absorption spectra, emission spectra, as well as the lifetime measurements were performed. The absorption cross-section was calculated to be 1.97 × 10−20 cm2 at 404 nm for σ polarization and 1.13 × 10−20 cm2 at 405 nm for π polarization, respectively. The highest emission cross-section at 593 nm was calculated to be 0.58 × 10−21 cm2 for σ polarization and 0.45 × 10−21 cm2 for π polarization, with full width at half maximum (FWHM) of 7.73 nm and 7.42 nm, respectively. Judd-Ofelt (JO) intensity parameters (Ω2, Ω4 and Ω6) and radiative properties for the important luminescent level of Sm3+ ions were derived by using the polarized absorption spectra of 8 at.% Sm:SrAl12O19. The fluorescence lifetime of 1 at.% and 8 at.% Sm:SrAl12O19 crystals were calculated to be 2.83 ms and 2.11 ms, respectively. The results indicate that the Sm:SRA crystal would be potential laser material for red-orange oscillation pumped by commercially 405 nm laser diode.