Mechanoluminescence by impulsive deformation of γ-irradiated Er-doped CaF2 crystals

Brahme, Nameeta; Shukla, Manju; Bisen, D. P.; Kurrey, U.; Choubey, A.; Kher, R. S.; Singh, Munshi

doi:10.1016/j.jlumin.2011.01.002

Cited by 23 publications

(8 citation statements)

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“…The indexing and refinement of lattice parameters are calculated using software Celref Version 3. The refined values of tetragonal di-calcium magnesium silicate were found as; a D 7.853 A , b D 7.853 A , cD 5.0182 A , a D 90 , b D 90 , g D 90 and cell volume D 330.2 (A ) 3 , which again signifies the proper preparation of the discussed sample and is shown in Table 1.…”

Section: Xrd Analysismentioning

confidence: 82%

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Mechanoluminescence of Ca₂MgSi₂O₇: Eu²⁺, Dy³⁺Phosphor by Impulsive Deformation

Shrivastava¹,

Kaur²

2015

Integrated Ferroelectrics

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Di-calcium magnesium silicate phosphor doped with Eu 2C and Dy 3C was prepared using solid state reaction technique under a reducing atmosphere. Prepared sample suffered an impulsive deformation with an impact of a piston for mechanoluminescence (ML) investigations. A temporal characteristic of ML of the phosphor was observed, which expressed single sharp peak with a long decaying section. In order to investigate about the luminescence centre responsible for ML peak, ML spectrum of the same phosphor was also observed. ML spectrum recorded shown similarity in shape as well as peak wavelength with Photoluminescence (PL) spectrum that verifies the existence of single emission centre due to the transition of Eu 2C ions i.e. transitions from any of the sublevels of 4f 6 5d 1 configuration to 8 S 7/2 level of the 4f 7 configuration. Decay rates for different impact velocities were also calculated using curve fitting technique. Time of ML peak and rate of decay did not change largely with respect to increasing impact velocity of the load and peak ML intensity varied linearly. Increasing impact velocity causes more number of Eu 2C ions to get excited to the higher energy level, subsequently de-excitation of more Eu 2C ions occurs. This gives rise to increase in ML intensity.

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Section: Xrd Analysismentioning

confidence: 82%

“…It can be excited by grinding, rubbing, cutting cleaving shaking, scratching, compressing, or crushing [1][2][3]. In the past no practical application could be made because of the low ML intensity of the materials and lack of reproducibility.…”

Section: Introductionmentioning

confidence: 99%

Mechanoluminescence of Ca₂MgSi₂O₇: Eu²⁺, Dy³⁺Phosphor by Impulsive Deformation

Shrivastava¹,

Kaur²

2015

Integrated Ferroelectrics

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“…The time dependence of the velocity of the piston may be written as (Brahme, Shukla, & Bisen, 2011;Chandra et al, 2012;Jha & Chandra, 2013).…”

Section: Mechanoluminescence Studymentioning

confidence: 99%

Mechanoluminescence, photoluminescence and thermoluminescence studies of SrZrO3:Ce phosphor

Tiwari¹,

Kuraria²,

Kuraria³

et al. 2015

Journal of Radiation Research and Applied Sciences

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Mechanoluminescence (ML)Photoluminescence Thermolumenescence Impact velocity a b s t r a c tThe present paper reports the synthesis and characterization, photoluminescence thermoluminescence and mechanoluminescence studies of Ce 3þ doped SrZrO 3 phosphors. The effects of variable concentration of Cerium on meachanoluminescence (ML) and photoluminescence behavior were studied. The samples were prepared by combustion a synthesis technique which is suitable for less time taking techniques also for large scale production for phosphors. The starting material used for sample preparation are Sr(NO 3 ) 3 , Zr(NO 3 ) 3 XH 2 O and Ce(NO 3 ) 3 6H 2 O and urea used as a fuel. The prepared sample was characterized by X-ray diffraction technique (XRD) with variable concentration of Ce (0.05 e0.5 mol%). There is no any phase change found with increase the concentration of Ce. Sample shows orthorhombic structure and the particle size calculated by Scherer's formula. The surface morphology of prepared phosphor was determined by field emission gun scanning electron microscopy (FEGSEM) technique. Mechanoluminescence studies on SrZrO 3 phosphors doped with Ce and underwent an impulsive deformation with an impact of a piston for Mechanoluminescence (ML) investigations. Temporal characteristics in order to investigate about the luminescence centre responsible for ML peak, increasing impact velocity causes more number of electrons will be ionized to reach to the conduction band so there will be more number of electrons available to be recombined at recombination or luminescence centre. In photoluminescence study PL emission spectra show the isolated peak position observed at 388 nm near UV region of spectrum due to 5de4f transition of Ce 3þ ion.Thermoluminescence study shows doping of Ce 3þ ions reduced the TL intensity TL glow curve shows the high fading and less stability when it doped with cerium. The activation energy high for the doped SrZrO 3 phosphor means that the trapped electron is highly trapped in trap level. The present study gives the advance application for fracture sensor, damage sensor including the biological sensor and development of solid state lighting.

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“…Thermoluminescence (TL) method is useful for studying the nature of traps and trapping levels in the crystals.Generally all thermoluminescence materials exhibit mechanoluminescence (10). Solid material could emit light by applying mechanical loads on them, the phenomenon referred as mechanoluminescence (ML).…”

Section: Introductionmentioning

confidence: 99%