Phosphorescence quenching by mechanical stimulus in CaZnOS:Cu

Tu, Dong; Xu, Chao‐Nan; Fujio, Yusaku; Kamimura, Sunao; Sakata, Yoshitaro; Ueno, Naohiro

doi:10.1063/1.4890112

Cited by 30 publications

(27 citation statements)

References 29 publications

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“…The pellet was exposed to UV light (365 nm) for 1 min; after a pause with different decay times (3, 20 min and 1, 3, 12 h), the phosphorescence intensity under the load was measured with a lab-made system comprising a universal testing machine (RTC-1310A, Orientec Corp., Tokyo, Japan) and a photon-counting system, which consisted of a photomultiplier tube (R585S, Hamamatsu Photonics, Hamamatsu, Japan), a photon counter (C5410-51, Hamamatsu Photonics), and a computer, as previously reported 26 . The testing machine applied a mechanical load, and the photon-counting system detected the phosphorescence intensity.…”

Section: Methodsmentioning

confidence: 99%

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Mechanism of mechanical quenching and mechanoluminescence in phosphorescent CaZnOS:Cu

Fujio

et al. 2015

Light Sci Appl

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This article reports a new phosphorescent material, CaZnOS:Cu, that exhibits two types of mechano-optical conversion: mechanical quenching and mechanoluminescence. An intense mechanical quenching of phosphorescence corresponding to mechanical stimuli can be achieved in CaZnOS:Cu within a short decay time period. Over time, it gradually changes to mechanoluminescence when a mechanical load is applied. We propose that the mechanical quenching and mechanoluminescence arise from the different roles of shallow and deep traps in CaZnOS:Cu. CaZnOS:Cu has promising applications in monitoring mechanical stress in industrial plants, structures, and living bodies. Keywords: mechanical quenching; mechanoluminescence; phosphorescence; traps INTRODUCTIONAdjusting and controlling the optical properties of materials by altering environmental factors are important in the development of various applications in sensing, memory, detection, and display devices [1][2][3][4][5][6] . Mechanical stress is the most common external stimulus, and thus materials that exhibit mechano-optical conversion are promising for practical applications in science and engineering [7][8][9][10][11][12] .Mechanoluminescent (ML) materials emit light when mechanical energy is applied and are effective for mechano-optical conversion 1,9,13,14 . Therefore, ML materials have been used as optical sensors for monitoring changes in mechanical stress. 25 , have been explored. Recently, our group has discovered another type of mechano-optical conversion, which is referred to as mechanical quenching (MQ) 26 . In contrast to ML, MQ is the quenching of phosphorescence intensity by using mechanical stimuli. Previously, we reported that CaZnOS:Cu exhibited MQ under applied mechanical stress. However, to understand the MQ process and mechanism further and use it for practical applications, the crystal structure, phosphorescence properties, and MQ properties of CaZnOS:Cu must be determined.Here, we carry out further study on MQ in a phosphorescent material, CaZnOS:Cu. We examine the change in crystal structure that is caused by changing the Cu concentration, the phosphorescence properties, and the MQ mechanism. We find that CaZnOS:Cu exhibits a variety of mechano-optical conversions depending on the experimental conditions. MATERIALS AND METHODSCaZnOS:Cu was synthesized by a solid-state reaction method. Highpurity CaCO 3 (50 mol% excess) and appropriate amounts of ZnS and Cu 2 O were weighed and ground in an agate mortar with ethanol and then sintered under an air flow at 1100 6 C for 5 h. The excess calcium compounds were removed from the sample by washing with an aqueous solution of acetic acid. After filtration and drying, CaZnOS:Cu was ground again and then pulverized for measurement.The crystalline phase of CaZnOS:Cu was characterized by using X-ray powder diffraction (XRD; RINT-2000, Rigaku Co., Tokyo, Japan) with CuKa radiation (1.5418 Å ; cathode voltage, 40 kV; current, 40 mA) at room temperature. As reported previously, CaZnOS has an unusual structure with the...

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Section: Methodsmentioning

confidence: 99%

“…25 , have been explored. Recently, our group has discovered another type of mechano-optical conversion, which is referred to as mechanical quenching (MQ) 26 . In contrast to ML, MQ is the quenching of phosphorescence intensity by using mechanical stimuli.…”

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confidence: 99%

Mechanism of mechanical quenching and mechanoluminescence in phosphorescent CaZnOS:Cu

Fujio

et al. 2015

Light Sci Appl

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“…Piezoluminescence, which is also called elasticoluminescence, is a form of mechanoluminescence (ML) during the elastic deformation, which has attracted considerable attention because it can be repeatedly used for mechano‐optical conversion . Elastic ML offers the advantages of wireless detection and nondestructive analysis, making it a promising candidate for various applications, such as stress sensing and damage diagnosis, and in particular for immediate in situ dynamic visualization of stress distribution in industrial plants, buildings, and living organisms.…”

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LiNbO₃:Pr³⁺: A Multipiezo Material with Simultaneous Piezoelectricity and Sensitive Piezoluminescence

et al. 2017

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Red-emitting piezoluminescence (elasticoluminescence) is achieved by doping rare earth Pr into the well-known piezoelectric matrix, LiNbO . By precisely tuning the Li/Nb ratio in nonstoichiometric Li NbO :Pr , a material that exhibits an unusually high piezoluminescence intensity, which far exceeds that of any well-known piezoelectric material, is produced. Li NbO :Pr shows excellent strain sensitivity at the lowest strain level, with no threshold for stress sensing. These multipiezo properties of sensitive piezoluminescence in a piezoelectric matrix are ideal for microstress sensing, damage diagnosis, electro-mechano-optical energy conversion, and multifunctional control in optoelectronics.

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“…Therefore, it might not be a conventional ML, but still could be categorized as one of varietal ML, because the luminescent phenomena were fundamentally used to sense the mechanical torque or stress [10]. More specific and systematic investigations considering the concurrent dual PL and ML variation induced by single mechanical action are currently under investigation on the basis of micro-mechanism approach [13]. In this study, UV light emitting diodes (LEDs) are also used for less expensive substitute for UV lamps to show potential applications of the luminescence sensor in automotive industry.…”

Section: Implementation Of Cost-effective Luminescence Sensormentioning

confidence: 98%

Mechanoluminescence torque transducer integrated with cost-effective luminescence sensor and UV LEDs

Kim

Yun

et al. 2015

SPIE Proceedings

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This paper presents a preliminary study investigating the development of a new type of non-contacting torque sensor based on the mechanoluminescence (ML) of a microparticles, such as ZnS:Cu. Typically, applications of ML microparticles have been used in a stress sensor applications successfully, in which these particles are applied to realtime visualization of the stress distribution of cracks, impacts, and ML light generation. Kim et al. demonstrated their potentials of ML microparticles by successfully measuring the sinusoidal torque applied to a rotational shaft through the measurement of the ML intensity signature using a photomultiplier tube (PMT) sensor, which can be widely used in various industrial areas such as automotives, robotics, rotors, and turbines. To show their further potential applications, a cost-effective luminescence sensor and UV LEDs are integrated, and used for detecting the variation of ML intensity in this study. In addition, precision sinusoidal torque waveform with high frequency up to 15 Hz is used to investigate the frequency-dependent hysteresis phenomenon.

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Phosphorescence quenching by mechanical stimulus in CaZnOS:Cu

Cited by 30 publications

References 29 publications

Mechanism of mechanical quenching and mechanoluminescence in phosphorescent CaZnOS:Cu

Mechanism of mechanical quenching and mechanoluminescence in phosphorescent CaZnOS:Cu

LiNbO₃:Pr³⁺: A Multipiezo Material with Simultaneous Piezoelectricity and Sensitive Piezoluminescence

Mechanoluminescence torque transducer integrated with cost-effective luminescence sensor and UV LEDs

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Phosphorescence quenching by mechanical stimulus in CaZnOS:Cu

Cited by 30 publications

References 29 publications

Mechanism of mechanical quenching and mechanoluminescence in phosphorescent CaZnOS:Cu

Mechanism of mechanical quenching and mechanoluminescence in phosphorescent CaZnOS:Cu

LiNbO3:Pr3+: A Multipiezo Material with Simultaneous Piezoelectricity and Sensitive Piezoluminescence

Mechanoluminescence torque transducer integrated with cost-effective luminescence sensor and UV LEDs

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LiNbO₃:Pr³⁺: A Multipiezo Material with Simultaneous Piezoelectricity and Sensitive Piezoluminescence