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IJSTR >> Volume 9 - Issue 3, March 2020 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Mechanoluminescence Of Rare Earth Doped Potassium Aluminum Silicate Phosphor

[Full Text]

 

AUTHOR(S)

Renu Nayar and Vinit Nayar

 

KEYWORDS

ML-Induced, potential of phosphor, piezoelectrically

 

ABSTRACT

The authors desired to expand the base of knowledge and application of ML-induced impacts with the specific goal of demonstrating the potential of phosphor based impact sensors. When a KAlSiO4:Dy samples are deformed impulsively by applying a load from a fixed height, then initially the ML intensity increases with time, attains a peak value Im at a particular time tm, and later on it decreases with time. The peak intensity Im increases linearly with the increasing height of the load. After tm, initially the ML intensity decreases at a fast rate, and later on it decreases at a slow rate. Light was generated from the interaction of a dropped mass and a small number of luminescence centers in the KAlSiO4: Dy powder. The ML in KAlSiO4: Dy samples can be understood on the basis of the piezoelectrically -induced electron detrapping model, in which the local piezoelectric field near the Dy2+ centres reduces the trap-depth, and therefore, the detrapping of filled electron traps takes place, and subsequently the energy released non-radiatively during the electron-hole recombination excites the Dy2+ centres and de-excitation gives rise to the ML.

 

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