Direct view of stress distribution in solid by mechanoluminescence

Xu, Chao‐Nan; Watanabe, Toshiro; Akiyama, Morito; Zheng, Xu–Guang

doi:10.1063/1.123865

Cited by 532 publications

(389 citation statements)

References 35 publications

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“…Another peculiar phenomenon in this compound is mechanoluminescence. This type of luminescence is closely related to persistent luminescence and has been studied intensively in the framework of pressure sensing [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

2014

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SrAl 2 O 4 :Eu,Dy is presumably the best known persistent luminescent phosphor. At room temperature, its green emission remains visible for hours after switching off the excitation. It is known that upon lowering the temperature of the phosphor a second photoluminescence emission band arises in the blue part of the visible spectrum, although its origin is still the subject of discussion. In this paper we thoroughly study the origin of both emission bands in SrAl 2 O 4 :Eu,Dy and we attribute this to europium ions substituting for the two different Sr sites in the phosphor's monoclinic host lattice. The photoluminescence properties, the thermal quenching behavior, and photoluminescence lifetime of both emission bands are investigated. A lanthanide energy level scheme is constructed for both sites. Using an integrated approach, i.e., combining charging, afterglow, and thermoluminescence measurements in the same run, we study the charging or trap filling processes in SrAl 2 O 4 :Eu,Dy upon excitation with site selective excitation wavelengths and at different temperatures. We show that trap filling is a thermally activated process when the green emitting center is excited at 435 nm.Furthermore, we also demonstrate that the distribution of filled traps after charging depends strongly on the excitation wavelength and thus on which Eu 2+ center has been excited. This suggests trapping of the electron close to the ionized Eu 2+ ion, without full delocalization to the conduction band during the trapping process. Finally, the quantum efficiency of the persistent luminescence is estimated at 65 (+/−10)%.

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Section: Introductionmentioning

confidence: 99%

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

2014

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“…3 ML is a phenomenon where photons are emitted by mechanical stimuli; it is of particular interest for use in stress sensing devices which detect damage, fracture, and deformation in various structures. [4][5][6] Although some inorganic oxides, such as SrAl 2 O 4 :Eu 2þ , 7 CaAl 2 Si 2 O 8 :Eu 2þ , 8 SrMg 2 (PO 4 ) 2 :Eu 2þ , 9 display ML, perovskite oxides which exhibit intense ML are very attractive because they can be used as multi-functional materials. However, not all of the phosphors with perovskite structure have ML performance, for example, there is no ML in CaTiO 3 :Pr 3þ and BaTiO 3 :Pr 3þ .…”

mentioning

confidence: 99%

“…This ML can be explained by using the carrier trap model: 7,9 an electron or hole trapped in a lattice defect, such as a point defect or co-doped ion, is released by a mechanical stimulus and recombines with a luminescence center, resulting in photon emission. Thus, lattice defects play an important role in ML emission.…”

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confidence: 99%

Strong reddish-orange light emission from stress-activated Sr_n+1Sn_nO_3n+1:Sm³⁺ (n = 1, 2, ∞) with perovskite-related structures

Kamimura¹,

Yamada

2012

Appl. Phys. Lett.

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112

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“…quartz and some polymers, but the most efficient ML materials reported are persistent luminescent materials [6][7][8][9][10][11][12][13].…”

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confidence: 99%

Mechanoluminescence in BaSi2O2N2:Eu

et al. 2012

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Mechanoluminescence (ML), a general term for the phenomenon in which light emission occurs during any mechanical action on a solid, can be divided roughly into two classes: destructive ML and non-destructive ML. For practical use in high-end applications (e.g. pressure sensors), materials with non-destructive ML properties are preferred. This paper reports on the strong non-destructive ML in BaSi 2 O 2 N 2 :Eu. When irradiated in advance with UV or blue light, this phosphor shows intense blue-green light emission upon mechanical stimulation such as friction or pressure. The ML has an emission band peaking at 498 nm, which is about 4 nm red-shifted compared to the steady state photoluminescence. The origin of the ML is discussed and related to the persistent luminescence of BaSi 2 O 2 N 2 :Eu. The same traps are responsible for both the phenomena.Based on the occurrence of ML in this phosphor, we were able to derive that the predominant crystallographic structure of BaSi 2 O 2 N 2 :Eu belongs to space group Cmc2 1 .

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Direct view of stress distribution in solid by mechanoluminescence

Cited by 532 publications

References 35 publications

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

Strong reddish-orange light emission from stress-activated Sr_n+1Sn_nO_3n+1:Sm³⁺ (n = 1, 2, ∞) with perovskite-related structures

Mechanoluminescence in BaSi2O2N2:Eu

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Direct view of stress distribution in solid by mechanoluminescence

Cited by 532 publications

References 35 publications

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

Trapping and detrapping inSrAl2O4:Eu,Dypersistent phosphors: Influence of excitation wavelength and temperature

Strong reddish-orange light emission from stress-activated Srn+1SnnO3n+1:Sm3+ (n = 1, 2, ∞) with perovskite-related structures

Mechanoluminescence in BaSi2O2N2:Eu

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Strong reddish-orange light emission from stress-activated Sr_n+1Sn_nO_3n+1:Sm³⁺ (n = 1, 2, ∞) with perovskite-related structures