Strong Excitation Research Articles

Deformation-based pushover analysis method for transverse seismic assessment of inverted Y-shaped pylons in kilometer-span cable-stayed bridges: Formulation and application to a case study

Kilometer-span cable-stayed bridges usually adopt tall inverted Y-shaped pylons. Such pylons may behave inelastically under strong transverse seismic excitations. Therefore, efficient analysis methods (e.g., pushover analysis) for transverse elastoplastic behavior assessments of inverted Y-shaped pylons are of great interest for academic and industrial communities. Based on equal displacement rule, this study proposes an applied deformation-based pushover analysis (DPA) incorporating a novel multi-node load pattern for the efficient transverse seismic behavior assessments of inverted Y-shaped pylons in kilometer-span cable-stayed bridges. A case study of the inverted Y-shaped pylon of Sutong Bridge is adopted to demonstrate the proposed DPA. The proposed multi-node load pattern for DPA is verified through the validation of the loaded-node selection and equal displacement rule for the studied pylon. The ability of DPA in seismic behavior assessments is then systematically validated by comparative studies with incremental dynamic analysis (IDA), conventional pushover analysis (CPA), and modal pushover analysis (MPA) in terms of displacement, bending moment and curvature responses of pylon as well as computational costs.

Comparative Study on Gemmological Characteristics and Luminescence of Colorless and Yellow Scapolites

The orange fluorescence of scapolite has been confirmed to be caused by (S2)−, but the frequent blue fluorescence in gem-quality scapolite has not been well explained. An energy dispersive X-ray fluorescence spectrometer (XRF), electron probe microanalyzer (EPMA), X-ray powder diffractometer (XRD), Fourier transform infrared spectrometer (FTIR), Raman spectrometer, ultraviolet-visible spectrophotometer, fluorescence spectrometer, and conventional gemological test methods were used to study the gemological characteristics, chemical composition, coloration mechanism, spectral characteristics, and luminescence of colorless and yellow scapolite. The results show that both yellow and colorless scapolites are mizzonite and that they share the same gemological and spectroscopic characteristics. The results of XRD, FIRT, and Raman spectra show that the yellow scapolite has the same structure as the colorless scapolite. The yellow color of scapolite is caused by Fe3+ and when the Fe content is low it is colorless. Yellow scapolite has about three times the Fe content of colorless scapolite. Under the excitation of long-wave and short-wave ultraviolet light, scapolite forms a strong and wide excitation peak in the blue-violet region centered at approximately 410 nm, which is due to the 4f1 → 5d1 of Ce3+, resulting in blue fluorescence.

Post-earthquake reliability assessment of segmental column structures based on nonlinear model updating

In this study, a Bayesian based nonlinear model updating approach is developed to enhance the post-earthquake reliability assessment of posttensioned segmental column structures. According to the proposed procedure, dynamic global sensitivity analysis (DGSA) approach is firstly performed to analyze the sensitivity of the model outputs to the model parameters, which aims to select the appropriate parameters for model updating, and then, the likelihood function of Bayesian estimation is constructed based on the residual errors between the measured and simulated dynamic responses of segmental column structures. Since the decomposed structural dynamic responses are conducted for model updating, the simulated error variance parameters are also considered as unknown. To simultaneously estimate the unknown model parameters and variance parameters, the maximum likelihood estimation approach is employed in this study. Then, the Cram-Rao lower bound (CRLB) analysis method is applied to estimate uncertainty of the identified model parameters that caused by measurement noise. Once nonlinear model updating is completed, the earthquake-induced failure probability of segmental column structure can be evaluated by performing reliability analysis. In numerical simulations, the feasibility of the proposed reliability assessment approach is validated by using a planar posttensioned segmental column model subjected to seismic loads. Furthermore, a scaled posttensioned segmental column structure subjected to bi-directional earthquake exactions is applied to verify the effectiveness of the proposed approach. Both numerical and experimental results have shown that the proposed strategy is accurate and effective for nonlinear model updating of segmental column structures, and the updated results are capable of using to evaluate the failure probability of such type of structures subjected to strong external excitations.

MoS2 Nanoplatelets on Hybrid Core-Shell (HyCoS) AuPd NPs for Hybrid SERS Platform for Detection of R6G

In this work, a novel hybrid SERS platform incorporating hybrid core-shell (HyCoS) AuPd nanoparticles (NPs) and MoS2 nanoplatelets has been successfully demonstrated for strong surface-enhanced Raman spectroscopy (SERS) enhancement of Rhodamine 6G (R6G). A significantly improved SERS signal of R6G is observed on the hybrid SERS platform by adapting both electromagnetic mechanism (EM) and chemical mechanism (CM) in a single platform. The EM enhancement originates from the unique plasmonic HyCoS AuPd NP template fabricated by the modified droplet epitaxy, which exhibits strong plasmon excitation of hotspots at the nanogaps of metallic NPs and abundant generation of electric fields by localized surface plasmon resonance (LSPR). Superior LSPR results from the coupling of distinctive AuPd core-shell NP and high-density background Au NPs. The CM enhancement is associated with the charge transfer from the MoS2 nanoplatelets to the R6G. The direct contact via mixing approach with optimal mixing ratio can effectively facilitate the charges transfer to the HOMO and LUMO of R6G, leading to the orders of Raman signal amplification. The enhancement factor (EF) for the proposed hybrid platform reaches ~1010 for R6G on the hybrid SERS platform.

Acoustic responses of underwater superhydrophobic surfaces subjected to an intense pulse

Underwater stability of an air layer trapped in a micro-structure, plastron, is critical in drag reduction applications. Here, we investigate the wetting state and plastron stability of underwater superhydrophobic surfaces (SHS) under an intense acoustic drive. Flat surfaces and SHS are subjected to short acoustic pulses of different intensities. At low amplitude, the comparison between the results of various surfaces shows that plastron behaves like a water–air interface, whose presence can be detected from the phase of the reflected acoustic waves. At moderate intensity, a wetting transition towards a completely wetting state is observed and shown to be triggered by a sufficiently large acoustic radiation pressure. This wetting transition is well captured by a simplified model by balancing radiation pressure with the critical capillary pressure for the interface sliding. Cavitation clouds appear under strong excitation; their sizes and positions greatly depend on the surface acoustic boundary condition. For SHS in a Cassie–Baxter state (with an air layer), cavitation clouds appear at specific locations (from the solid surface) corresponding to the pressure anti-node of the transient standing wave generated by the reflection. This study unprecedentedly demonstrates the capability of acoustic waves to monitor and characterize plastron stability with low and moderate amplitudes, respectively.

Collective excitation of Bose–Einstein condensate of 23Na via high-partial wave Feshbach resonance

We experimentally observe the collective excitation (called surface-mode excitation) of Bose–Einstein condensate of 23Na by ramping the external magnetic field across the high-partial wave magnetic Feshbach resonance corresponding to vary the atomic interaction. We check the collective surface mode excitation of state for the three d-wave and three g-wave Feshbach resonances below 600 G and find that only two d-wave resonances present the strong excitation, another d-wave resonance only creates a weak excitation, and all g-wave resonances do not, which reflects the strength of these magnetic Feshbach resonances. For the collective excitation, the excitation of surface modes along the axial weak-confinement and radial strong-confinement of optical dipole trap shows different characteristics. We also study the lifetime of the collective oscillation by measuring the damping rate of the oscillation amplitude, which is caused by the mechanisms of dephasing effect and collisional relaxation. This excitation method gives us a new tool for investigating the properties of ultracold quantum gases without changing the trap frequencies.

Hydraulic fracture of concrete-rock interface in reservoir-gravity dam-foundation system under seismic conditions

Under strong seismic excitation, hydraulic fractures considering ultrahigh reservoir load at the gravity dam-foundation interface adversely affect the stability of the generalized structure. Based on the reservoir-dam-foundation interaction model, dynamic water pressure model, and contact element, a new numerical model that simulates interfacial hydraulic fracture is established by introducing generalized stress intensity factors and the Hutchinson-Suo propagation criterion. Using a preset crack at the dam heel and tracking its trajectory, this study compares the structural damage and crack propagation process in the interface and homogeneity models, investigates the influence of different water pressure distributions along the crack faces on the seismic response of the structure and fracture characteristics, and finally conducts a sensitivity analysis of the parameters in the dam-foundation system. The numerical results show that the presence of the interface between the dam and foundation significantly alters the damage characteristics of the structure and the propagation path of the cracks. Regarding seismic analysis in actual engineering, it is reasonable to assume that the water pressure is uniformly distributed along the crack faces initiated from the dam heel. When the fracture toughness of the foundation rock is less than or greater than that of concrete by up to 14.3%, and the difference is not more than 0.5 MPa·m1/2, the cracks kink into the foundation; otherwise, the cracks may kink into the dam body.

Behaviour of Soil-Steel Composite Bridges under Strong Seismic Excitation with Various Boundary Conditions.

Soil-steel composite bridges typically range from 3 to 32 m, and they can be applied as an effective alternative for reinforced concrete bridges with short spans. They are able to meet the same design and safety requirements as traditional bridges more rapidly and at a lower cost. The behaviour of such bridges under seismic events is not yet recognized, because seismic excitations are completely different from the static and dynamic loads that have been analysed so far. This paper presents the results of the numerical study of two various types of soil-steel composite bridges under strong seismic excitation. The first soil-steel composite bridge has a span of 17.67 m and a height of 6.05 m, and the second consists of two shells with a span of 4.4 m each and a height of 2.8 m. Numerical analysis was performed for three models for each bridge, taking into account different boundary conditions. The applied boundary conditions are intended to represent the commonly used reinforcements of this type of bridges (reinforced concrete collar, reinforced concrete front wall). The obtained results were compared with the model in which such reinforcements were not used. Calculations were conducted using the DIANA program based on a finite element method. The non-linear models with seismic excitation of El Centro from 1940 and Time History analysis were applied. The conclusions from the study can be useful in making a decision regarding the design of the soil-steel composite bridges located in seismic zones. In addition, it was found that the effect of the applied strengthening is significant in the behaviour of soil-steel composite bridges.

Impact of dark excitons on Förster-type resonant energy transfer between dye molecules and atomically thin semiconductors

Interfaces of dye molecules and two-dimensional transition metal dichalcogenides (TMDCs) combine strong molecular dipole excitations with high carrier mobilities in semiconductors. F\"orster type energy transfer is one key mechanism for the coupling between both constituents. We report microscopic calculations of a spectrally resolved F\"orster induced transition rate from dye molecules to a TMDC layer. Our approach is based on microscopic Bloch equations which are solved self-consistently together with Maxwells equations. This approach allows to incorporate the dielectric environment of a TMDC semiconductor, sandwiched between donor molecules and a substrate. Our analysis reveals transfer rates in the meV range for typical dye molecules in closely stacked structures, with a non-trivial dependence of the F\"orster rate on the molecular transition energy resulting from unique signatures of dark, momentum forbidden TMDC excitons.

Approaching PetaVolts per Meter Plasmonics Using Structured Semiconductors

A newly uncovered class of plasmons in the strongly excited limit opens access to unprecedented Petavolts per meter electromagnetic fields with wide-ranging, transformative impact. Unlike conventional plasmons, such plasmons are constituted by non-perturbative, large-amplitude oscillations of the ultradense, delocalized free electron Fermi gas inherent in conductive media. Here structured semiconductors doped to have an appropriate conduction electron density are introduced to tune the properties of the Fermi gas for matched excitation of large-amplitude plasmons using readily available electron beams which enables immediate experimental validation. Specifically, an electrostatic, surface “crunch-in” plasmon is collisionlessly excited by the beam launched inside a tube. Strong excitation due to matching results in relativistic oscillations of the electron gas and unravels unique phenomena. Relativistically induced ballistic electron transport comes about due to relativistic multifold increase in the mean free path and also leads to unconventional heat deposition beyond Ohm’s law. This explains the absence of observed damage or solid-plasma formation in past experiments on conductive samples interacting with electron bunches shorter than 10−13 seconds. Furthermore, relativistic momentum leads to copious tunneling of electron gas across the surface, which then crunches inside the tube. Relativistic effects along with large, localized electron density variations underlying these modes necessitate kinetic approach to theoretical and computational modeling. Kinetic model presented here demonstrates experimental viability of observing tens of gigavolts per meter plasmonic fields excited by matching readily available electron beams to plasmons in semiconductors with 1018cm−3 free electron density, and paves the way for Petavolts per meter plasmonics.

A highly efficient Mn4+ activated Nb-based oxyfluoride red fluorescent material with excellent water stability: preparation and performance analysis.

In this study, an efficient non-rare earth Mn4+-doped K3(NbOF5)(HF2) red fluorescent material was synthesized by using the coprecipitation method. Replacing KF with K2CO3 effectively solved the problem that KF was difficult to stir due to its strong water absorption. The sample was composed of rods. The excitation spectra consisted of two strong excitation peaks at 366 nm and 468 nm. The emission spectra consisted of a series of narrow-band emissions between 580 nm and 680 nm. Besides, the luminescence quantum efficiency (QE) reached 84.3% under the excitation of 468 nm. The fluorescent lifetime of K3(NbOF5)(HF2):Mn4+ was less than 4 ms, which can achieve fast response display in backlight display applications. The WLED was fabricated with K3(NbOF5)(HF2):Mn4+ and commercial YAG:Ce3+ and the commercial InGaN blue chip. At a 30 mA drive current, the WLED device exhibited excellent luminescence properties. The correlated color temperature (CCT) was 3853 K, the Ra was 90.1 and the luminous efficiency was 310.432 lm W-1. Therefore, K3(NbOF5)(HF2):Mn4+ has very broad prospects in WLED lighting and backlight display applications.

Nasal Caffeine Thermo-Sensitive In Situ Gel for Enhanced Cognition after Sleep-Deprivation.

Caffeine abundant in coffee has a strong excitation effect on the central nerve system (CNS). To combat the adverse effects of sleep deprivation on physical and mental health, this article designed a new nasal temperature-sensitive gel loaded with caffeine, whose effects of awakening and improving cognition in sleep-deprived rats were evaluated. It was found that the caffeine thermo-sensitive in situ gel (TSG) stayed in the nasal cavity for a longer time and increased the contact time between the drugs and the nasal mucosa, which made it possible for caffeine TSG to exert a lasting effect. Secondly, compared with sleep-deprived rats, those administrated with caffeine TSG were more responsive in behavioral experiments. Moreover, the antipentobarbital test proved that caffeine TSG could prolong the sleep latency and shorten the sleep time. Furthermore, caffeine TSG could significantly restore the cognitive ability by ameliorating neuronal cell injuries by upregulating brain-derived neurotrophic factor (BDNF) levels. Generally, caffeine TSG could quickly exert the efficacy of enhancing cognition and wakefulness, and overcome the drawbacks of frequent medications. It can potentially be used for the treatment of psychiatric disorders, such as dementia, Parkinson and Alzheimer's disease.

Structure and luminescence properties of Dy3+ doped quaternary tungstate Li3Ba2Gd3(WO4)8 for application in wLEDs.

Quaternary tungstates with the composition Li3Ba2Gd3(WO4)8 doped with different concentrations of Dy3+ (from 0.5 to 10 at%) were prepared by the solid-state reaction method at 900 °C. Their structural, spectroscopic and optical properties were studied systematically in this work. X-ray diffraction analysis confirmed the crystallization of Li3Ba2Gd3(WO4)8 to have a monoclinic structure (sp. gr. C2/c); the lattice constants for 1 at% doping concentration of Dy3+ are a = 5.2126(2) Å, b = 12.7382(1) Å, c = 19.1884(3) Å, Vcalc = 1273,40(4) Å3 and β = a × c = 91.890(9)°. The first principles calculations for the undoped crystal revealed a direct bandgap of 2.45 eV, which is very close to the experimental one. The identified broad, and strong excitation peak at 450 nm indicates that Li3Ba2Gd3(WO4)8:Dy3+ phosphors are suitable to be pumped by a blue laser diode (LD). Under excitation at 445 nm, the phosphor showed a stronger luminescence peak at 575 nm which corresponds to the Dy3+:4F9/2 → 6H13/2 transition, and three weaker emissions peaks at 477, 661, and 750 nm. Meanwhile, the effect of different Dy3+ contents on the luminescence properties was investigated. The optimum concentration to minimize the quenching effect was 4 at% and the critical distance is 31.209 Å. The phosphor emitted strong greenish-yellow light situated at (0.425, 0.472) in CIE coordinates with a color temperature of 3652 K. All the measured luminescence lifetime curves exhibited a single-exponential nature. Excellent thermal stability was found for this tungstate phosphor (the activation energy is 0.352 ± 0.01 eV). The measured absolute photoluminescence quantum yield was around 10.5%. The results presented in this work show that Li3Ba2Gd3(WO4)8:Dy3+ phosphors with strong yellow emission are promising candidates for white-light emitting LED (wLED) applications.

Dynamic structural response of DEMO divertor under electromagnetic loading

The divertor of a tokamak-type fusion reactor is subject to the potential risk of accidental plasma disruptions. This fast transient event produces strong and brief electromagnetic (EM) excitation loads exerting in the divertor in form of volume forces and moments. Moreover, the transient nature of the impact loads could cause a substantial dynamic amplification of the Lorentz forces and moments due to the interaction between the (transient) resonance and mass inertia. This dynamic amplification effect must be considered in the structural design of the divertor in addition to the static loads. One pragmatic approach to do this is to apply the notion of dynamic amplification factor (DAF) as a kind of a force multiplier coefficient in order to reflect the dynamic effect in a static stress analysis. To this end, the dynamic amplification factor needs to be determined for the given geometry of the components and the typical application modes of relevant impact loads. The key objective of this dynamic analysis is to identify the natural frequencies (eigen-frequency) and the deformation modes. The dynamic effect on the stress intensity in the critical regions is also examined. This study presents a unique insight into the structural dynamics induced by a plasma disruption and delivers a very useful design parameter for the force component of the load, namely, dynamic amplification factor which allows a straightforward way of considering the resonance response in a static structural analysis.

Observation of the Mollow triplet from an optically confined single atom

Resonance fluorescence from atomic systems consists of a single spectral peak that evolves into a Mollow triplet for a strong excitation field. Photons from different peaks of the triplet show distinct timing correlations that make the fluorescence a useful light source for quantum information purposes. We characterize the fluorescence of a single optically trapped $^{87}\mathrm{Rb}$ atom that is excited resonantly at different power levels. Second-order correlation measurements reveal the single photon nature of the fluorescence concurrently with Rabi oscillations of a strongly excited atom. The asymmetry in correlations between photons from two sidebands of the fluorescence spectrum when the atom is exposed to an off-resonant field indicates that there is a preferred time ordering of the emitted photons from different sidebands.

Behaviour of Irregular Reinforced Concrete Frames under Seismic Loading

The present world demands the multi storey buildings due to lack of space availability in the urban areas to accommodate the increased population with their proposed requirements. Multi-storey building’s behaviour during high seismic action depends mainly on Structural configuration. Structural configuration having any discontinuities in plan or in elevation are termed as building with irregularities. When these irregularities are present in the structure, buildings suffer much more damage during strong earthquake excitations which was recorded in the past. The Irregularities are defined as per IS:1893 (Part 1)-2016 code. This paper is concerned about the various types of plan, vertical and combined irregularities and their effect under seismic loading. The objective of the present study is doing linear static and dynamic analysis i.e., ESA and RSA on various irregular building frames and calculating their response using some seismic parameters like displacement response, storey drift, inter storey drift ratio and base shear for which the frames are designed using IS 456-2000 and special detailing for fulfilling the ductility requirement is done as per IS: 13920-2016. Comparison of the results of analysis in X and Y directions of irregular structures is done with regular structure. The scope of the present study also includes the maximum and minimum effect on the various types of irregular structures under seismic loading and to know if the presence of irregularities always amplifies the response or not.

Depolarization block in olfactory sensory neurons expands the dimensionality of odor encoding.

Upon strong and prolonged excitation, neurons can undergo a silent state called depolarization block that is often associated with disorders such as epileptic seizures. Here, we show that neurons in the peripheral olfactory system undergo depolarization block as part of their normal physiological function. Typically, olfactory sensory neurons enter depolarization block at odor concentrations three orders of magnitude above their detection threshold, thereby defining receptive fields over concentration bands. The silencing of high-affinity olfactory sensory neurons produces sparser peripheral odor representations at high-odor concentrations, which might facilitate perceptual discrimination. Using a conductance-based model of the olfactory transduction cascade paired with spike generation, we provide numerical and experimental evidence that depolarization block arises from the slow inactivation of sodium channels-a process that could affect a variety of sensory neurons. The existence of ethologically relevant depolarization block in olfactory sensory neurons creates an additional dimension that expands the peripheral encoding of odors.

The performance of nonlinear vibration control via NiTiNOL–Steel wire ropes

Conventional nonlinear vibration absorbers must provide additional mass and motion space to achieve the expected vibration control effect, which will significantly alter the original design of the target structure. In this study, the shape memory NiTiNOL–steel (NiTi–ST) wire rope and composite plate are coupled to investigate the vibration control effect of such a configuration. The vibration response of the model is studied using the Galerkin truncation method (GTM) and the harmonic balance method (HBM), and the stability of the frequency response curve is determined using the linearized stability theory. NiTi–ST wire rope is found to have a good damping effect for both low- and high-order resonances. Under a strong external excitation, the appearance of the closed detached response (CDR) may cause system amplitude mutation; however, it can also achieve effective inhibition. Finally, the effect of the structural parameters on the vibration control is discussed. The nonlinear damping term in NiTi–ST determines the soft and hard characteristics of the system, while the equivalent linear damping term is mainly responsible for vibration suppression. Therefore, as a novel shock absorber, NiTi–ST can be applied to engineering structures in order to prevent vibration damage.

Prelimbic and infralimbic medial prefrontal cortex neuron activity signals cocaine seeking variables across multiple timescales.

The prefrontal cortex is critical for execution and inhibition of reward seeking. Neural manipulation of rodent medial prefrontal cortex (mPFC) subregions differentially impacts execution and inhibition of cocaine seeking. Dorsal, or prelimbic (PL), and ventral, or infralimbic (IL) mPFC are implicated in cocaine seeking or extinction of cocaine seeking, respectively. This differentiation is not seen across all studies, indicating that further research is needed to understand specific mPFC contributions to drug seeking. We recorded neuronal activity in mPFC subregions during cocaine self-administration, extinction, and cue- and cocaine-induced reinstatement of cocaine seeking. Both PL and IL neurons were phasically responsive around lever presses during cocaine self-administration, and activity in both areas was reduced during extinction. During both cue- and, to a greater extent, cocaine-induced reinstatement, PL neurons exhibited significantly elevated responses, in line with previous studies demonstrating a role for the region in relapse. The enhanced PL signaling in cocaine-induced reinstatement was driven by strong excitation and inhibition in different groups of neurons. Both of these response types were stronger in PL vs. IL neurons. Finally, we observed tonic changes in activity in all tasks phases, reflecting both session-long contextual modulation as well as minute-to-minute activity changes that were highly correlated with brain cocaine levels and motivation associated with cocaine seeking. Although some differences were observed between PL and IL neuron activity across sessions, we found no evidence of a go/stop dichotomy in PL/IL function. Instead, our results demonstrate temporally heterogeneous prefrontal signaling during cocaine seeking and extinction in both PL and IL, revealing novel and complex functions for both regions during these behaviors. This combination of findings argues that mPFC neurons, in both PL and IL, provide multifaceted contributions to the regulation of drug seeking and addiction.

Surfactant-induced modification in photoluminescence properties of Ce0.9-xY0.1DyxO2-δ phosphors for single host white light emitting diodes

Dy3+/Y3+ codoped spherical ceria particles were synthesized via a sol-gel method using P123 as a surfactant. P123 amount was varied to control particle size around 70–200 nm. Photoluminescence excitation spectra of as-obtained ceria nano phosphors exhibited broadband around 280–305 nm due to O2− to Ce4+ and Dy3+ charge transfer along with several sharp peaks around 325–365 nm due to f-f transitions. Strong UV excitation showed that the current phosphors were apposite for NUV-LEDs. The emission spectra of Ce0.895Y0.1 Dy0.005O2-δ phosphors comprised 489 (blue) and 579 nm (yellow) emissions corresponding to Dy3+ f-f transitions. The increase in emission intensities with P123 concentration was observed due to enhancement in crystallinity and particle size. Low Ω2 (Judd Ofelt parameter) of 1.1 × 10−20 cm2 for Ce0.895Y0.1Dy0.005O2-δ phosphors synthesized without P123 indicated high symmetry neighboring Dy3+ ions. The increase in P123 concentration resulted in the elevation of Ω2 value, leading to asymmetry surrounding Dy3+ ions. The local environment of Dy3+ was asymmetric, which caused the electric-dipole transition to upend the magnetic-dipole transition. Hence, the blue-to-yellow emission ratio (B/Y) was varied with P123, facilitating white light emission with color-coordinate (0.38,0.34). Photoluminescenc intensity of synthesized phosphors retained 86% of initial intensity at 500K (activation energy of 0.26 eV), indicating high stability at elevated temperature. The LEDs fabricated with present phosphors exhibited a color-rendering index and correlated color temperatures around 76.3 and 6065 K, respectively. The suitable Judd-Ofelt parameters and moderate activation energy suggested the feasibility of Ce0.885Y0.1Dy0.015O2-δ phosphors for white-light-emitting diodes.