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Fracto-mechanoluminescence in Mn/Cu doped ZnS induced by steel ball and cylindrical piston
摘要： Herein, we present a comparison of fracto-mechanoluminescence (FML) from ZnS: Mn and ZnS:Cu phosphors prepared by solid state reaction (SSR) route. The FML emitted by two phosphors was compared in terms of its dependence on time and velocity. The FML intensity initially increases with time attains a peak value followed by decrease at still longer times. Peak ML intensities in both the cases are found to linearly increase with impact velocity and total ML intensity linearly increases with mass of the phosphor samples. ML and photoluminescence (PL) spectra of ZnS: Mn and ZnS: Cu phosphors are recorded to lie at 540 nm and 580 nm, respectively.
关键词： Sensor,ZnS: Cu,ZnS: Mn,Mechanoluminescence,Phosphors
更新于2025-11-21 11:18:25
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Piezoluminescent devices by designing array structures
摘要： Mechanoluminescence has attracted increasing attentions because it can convert the kinetic energy during human daily motions into light to be used in sensors and displays. However, its practical applications are still hindered by the weak brightness and limited color while under large forces. Herein, we developed novel piezoluminescent devices (PLDs) which could effectively emit visible light under low pressing forces through the stress-concentration and enhancing deformation on the basis of carefully-designed array structures. The emitting colors were also tunable by using bilayer luminescent film under different pressures. This work not only provides a new strategy to effectively harvest mechanical energy into light, but also presents a scalable, low-cost and color-tunable PLD which shows great potentials in various applications such as luminescent floors, shoes and stress-activated displays.
关键词： mechanoluminescence,color-tunable,piezoluminescent device,array structure
更新于2025-09-23 15:23:52
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Synthesis and mechanoluminescent property of (Eu2+, Dy3+)-co-doped strontium aluminate phosphor by soft mechanochemistry-assisted solid-state method
摘要： (Eu2+, Dy3+)-co-doped strontium aluminate (SrAl2O4:Eu2+, Dy3+) powder as a mechanoluminescent (ML) phosphor was synthesized via soft mechanochemical pretreatment of precursor mixtures in a stirred media mill and subsequent calcination. Effect of soft mechanochemical pretreatment of precursors on the synthesis process as well as the photoluminescent (PL) and ML properties of SrAl2O4:Eu2+, Dy3+ phosphor was investigated. The precursor mixtures unground and ground at different time and the resultant phosphors were characterized by laser particle size analysis, X-ray diffraction, scanning electron microscopy, differential scanning calorimetry, Fourier transfer infrared spectroscopy and optical property measurement. The results reveal that soft mechanochemical pretreatment of precursor mixture promotes the crystal growth, and reduces the subsequent calcination temperature. SrAl2O4:Eu2+, Dy3+ phosphor can be obtained via calcining at 1200 oC for precursor mixture ground at 60 min, but formed via calcining at 1400 oC for unground precursor mixture. The phosphor synthesized with precursor mixture ground at 60 min has the maximum PL and ML intensities due to the enhancement of Eu2+ and Dy3+ ions into the crystal lattice to form more electron traps. The measurements by a designed ML instrument indicate that the ML intensity increases with increasing impact stress, and decreases with multiple applications of the same impact stress on phosphor disks.
关键词： Phosphor,Soft mechanochemistry,(Eu2+, Dy3+)-co-doped strontium aluminate,Solid-state method,Mechanoluminescence
更新于2025-09-23 15:22:29
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Resonant Piezoelectroluminescent Fiber-Optical Sensor of a Temperature Field in Composite Structures
摘要： A dynamic mathematical model of functionation of a fiber-optical sensor in the process of resonant diagnosing of a temperature field inhomogeneous along the longitudinal axis of the sensor is developed. The resonant approach is based on a given amplitude-frequency characteristic of forced stationary electroelastic vibrations of a local section of the sensor caused by the action of the harmonic component of controlling voltage (CCV) on its electrodes; the constant CCV is necessary for tuning the sensor to the operating mode in the range of temperatures considered. The density distribution function of temperature along the sensor is found by solving the Fredholm integral equation of the first kind using the measured values of derivative with respect to the frequency of the harmonic CCV of the function of the amplitude of intensity of glow at the exit of the fiber-optical sensor. A method for resonant scanning of an ina uniform temperature field along the longitudinal axis of the sensor is developed; the method uses a new algorithm for processing the intensity of informative light signals at the exit from the optical fiber for various frequencies of the harmonic CCV. Results of a numerical modeling of the function of intensity of light pulses at the exit from the fiber-optical sensor, of the distribution of voltage amplitudes on the electroluminescent layer and of resonance frequencies along the sensor axis are presented for diagnosing an inhomogeneous model temperature field.
关键词： light intensity,mechanoluminescence effect,piezoresonator,Fredholm integral equation,optical fiber,numerical modeling,piezoelectroelasticity,temperature sensor
更新于2025-09-11 14:15:04
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Mechanoluminescence of a composite based on polymethylmethacrylate and fine-disperse powder of SrAl <sub/>2</sub> O <sub/>4</sub> :(Eu <sup>2+</sup> , Dy <sup>3+</sup> ) phosphor
摘要： The paper deals with photoluminescence and deformation (mechanoluminescence) of a composite material based on fine-disperse powder of phosphor SrAl2O4:(Eu2+, Dy3+) and polymethylmethacrylate that is transparent in the visible region. The luminescent (sensory) layer responsive to mechanical action was formed in the surface layer of the polymethylmethacrylate. To excite of photoluminescence the short pulses of a nanosecond laser were used. Mechanoluminescence was excited by the short acoustic impulses generated by a nanosecond laser. New information about the energy levels of impurities was obtained.
关键词： Dy3+),SrAl2O4:(Eu2+,composite material,polymethylmethacrylate,mechanoluminescence,photoluminescence
更新于2025-09-11 14:15:04
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Dislocation density level induced divergence between stress-free afterglow and mechanoluminescence in SrAl2O4: Eu2+, Dy3+
摘要： In this paper, we report on a new photonic behavior based on a series of photoluminescence and mechanoluminescence experiments conducted on Strontium aluminate (SrAl2O4) (SAO) co-doped with lanthanide ions such as Eu2+ (europium ion) and Dy3+ (dysprosium ion) (SAOED). It was observed that the increase of the dislocation density in SAOED decreased its stress-free afterglow while increasing its mechanoluminescence (ML). The dissimilar behavior between these two properties is yet to be reported in literature. We observed that as the lattice strain increased, the light intensity change ratio (LICR) during an applied exogenous tensile force increased while the stress-free afterglow decreased. As the crystallite size decreased, the LICR increased while the stress-free afterglow decreased. All the aforementioned observations resulted in the introduction of a newly joint stress-free afterglow-ML mechanism where the interstitial vacancy in the SAO host lattice should be taken in consideration. Based on the trap-depth reduction model, we derived a LICR expression and predicted the current ML behavior as well for other photonic materials. The fundamental findings presented in this work will drastically change the paradigm of mechanoluminescent material design and pave the way for the full development of this technology.
关键词： Dislocation,Stress sensor,Mechanoluminescence,Photonic materials,Photoluminescence
更新于2025-09-10 09:29:36
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Piezophotonics: From fundamentals and materials to applications
摘要： The piezophotonic effect is the coupling between piezoelectric properties and photoexcitation, where strain-induced piezopotential modulates and controls the relevant optical process. Specifically, metal ions as activators are capable of responding to photoexcitation and subsequent emission of light, also called mechanoluminescence, in general, and piezoluminescence specifically for piezoelectrics. These phenomena are helpful for understanding the materials fundamentals and conceiving widespread device applications. In this article, we briefly introduce the physical mechanisms of piezophotonics, including piezoluminescence. Selected host materials and metal-ion activators are described for demonstrating the piezophotonic effect. We provide a unified profile and recent prototypical demonstrations of light emission triggered by mechanical stimuli. The devices based on these materials offer the advantages of remote detection, nondestructive analysis, and repeatability, hence they are promising candidates for applications in stress sensing, structural health diagnosis, three-dimensional handwriting, magnetic-optical sensing, energy harvesting, biomedicine, novel light sources, and displays.
关键词： energy harvesting,piezoluminescence,mechanoluminescence,piezophotonics,stress sensing
更新于2025-09-04 15:30:14