Electronic structure of the KCl and AgCl nanocrystals with edge dislocations

Timoshenko, Yu. K.; Shunina, V. A.

doi:10.1002/pssc.200460549

Cited by 10 publications

(5 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is to be noted that thermodynamic analysis suggests that dislocations and stacking faults should be unstable in nanoparticles with respect to diffusion to the surface and annihilation. However, such defects may be retained by kinetic factors; for example, association with large scale shape features derived from the assembly of smaller nanoparticles precursors [41][42][43][44], or be trapped at nanoparticles grain boundaries. The existence of dislocations in ZnS nanoparticles has also been reported [45,46].…”

Section: Mechanism Of the Elastico ML Of Zns:mn Nanoparticlesmentioning

confidence: 99%

Luminescence induced by elastic deformation of ZnS:Mn nanoparticles

Chandra

Yamada

et al. 2010

Journal of Luminescence

110

View full text Add to dashboard Cite

Section: Mechanism Of the Elastico ML Of Zns:mn Nanoparticlesmentioning

confidence: 99%

Luminescence induced by elastic deformation of ZnS:Mn nanoparticles

Chandra

Yamada

et al. 2010

Journal of Luminescence

110

View full text Add to dashboard Cite

“…The liberation of holes from V

_{K}

-centres or impurities can also be sensitized by dislocations [327]. The existence of dislocation induced bands (DIBs) in the band gap is not always valid, for example such DIBs are absent in the band gap of KCl and NaCl as predicted by quantum chemical calculations [328]. The energy difference between the F-centre levels and DIBs as claimed in temperature dependent ML is actually associated with the thermal activation energy of the movement of dislocations [329].…”

Section: Proposed Mechanism and Modelsmentioning

confidence: 99%

A Review of Mechanoluminescence in Inorganic Solids: Compounds, Mechanisms, Models and Applications

2018

View full text Add to dashboard Cite

Mechanoluminescence (ML) is the non-thermal emission of light as a response to mechanical stimuli on a solid material. While this phenomenon has been observed for a long time when breaking certain materials, it is now being extensively explored, especially since the discovery of non-destructive ML upon elastic deformation. A great number of materials have already been identified as mechanoluminescent, but novel ones with colour tunability and improved sensitivity are still urgently needed. The physical origin of the phenomenon, which mainly involves the release of trapped carriers at defects with the help of stress, still remains unclear. This in turn hinders a deeper research, either theoretically or application oriented. In this review paper, we have tabulated the known ML compounds according to their structure prototypes based on the connectivity of anion polyhedra, highlighting structural features, such as framework distortion, layered structure, elastic anisotropy and microstructures, which are very relevant to the ML process. We then review the various proposed mechanisms and corresponding mathematical models. We comment on their contribution to a clearer understanding of the ML phenomenon and on the derived guidelines for improving properties of ML phosphors. Proven and potential applications of ML in various fields, such as stress field sensing, light sources, and sensing electric (magnetic) fields, are summarized. Finally, we point out the challenges and future directions in this active and emerging field of luminescence research.

show abstract

“…It is to be noted that thermodynamic analysis suggests that dislocations and stacking faults should be un-stable in nanoparticles with respect to diffusion to the surface and annihilation. However, such defects may be retained by kinetic factors; for example, association with large scale shape features derived from the assembly of smaller nanoparticles precursors [44][45][46][47], or be trapped at nanoparticles grain boundaries. The existence of dislocations in ZnS nanoparticles has also been reported [48,49].…”

Section: Mechanism Of the Eml Of Zns:mn Nanoparticlesmentioning

confidence: 99%

Mechanoluminescence of Nanoparticles

Chandra¹

2011

TONANOJ

View full text Add to dashboard Cite

Certain nanoparticles exhibit intense light emission during their elastic deformation, called the phenomenon of elastico mechanoluminescence (EML).When ZnS:Mn and SrAl 2 O 4 :Eu nanoparticles are deformed in the elastic region by the stress initially increasing with time and then attaining a fixed value or by the stress initially increasing and then decreasing with time or by the impact stress, then after a threshold pressure, initially the EML intensity increases with time, attains a maximum value and later on it decreases with time. For the fixed pressure or slowly decreasing pressure, the slow decay time of EML is equal to the lifetime of electrons in the shallow traps lying in the normal piezoelectric region of the crystals.In these cases, sometimes, fast decay of EML also appears and it is related to the machine-constant, that is, the decay time of strain-rate after the power to the cross-head of the machine is switched off. For the fast-deformation caused by impact stress, the fast decay time of EML is controlled by the rise time of impact stress, and the slow decay of EML gives the lifetime of retrapped electrons in the shallow traps. For ZnS:Mn and SrAl 2 O 4 :Eu nanoparticles, the total EML intensity increases quadratically with the applied pressure. The diminished EML intensity of SrAl 2 O 4 :Eu nanoparticles caused by number of pressings can be recovered by exposing the sample to UV-radiation. The tribo ML of ZnS:Mn nanoparticles increases with increasing value of the load placed on the rotating rod inducing tribo ML. The EML spectra of ZnS:Mn and SrAl 2 O 4 :Eu nanoparticles are similar to their photoluminescence and electroluminescence spectra. The piezoelectrically-induced detrapping model is found to be suitable for the EML of nanoparticles and the expressions derived on the basis of this model are able to explain successfully the characteristics of the EML of nanoparticles. The EML of nanoparticles has been found useful in stress sensor and an EML-based safety-management monitoring system has been developed. The EML of nanoparticles can be used for the visualizations of stress distribution in solids, stress field near crack-tip, quasidynamic crack-propagation in solids and internal defect in a pipe. The EML intensity of nanoparticles is so intense that it is able to drive a solar cell system and it can be used as a light-source for specific applications. Furthermore, several parameters of nanoparticles can be determined from their EML measurements.

show abstract

Electronic structure of the KCl and AgCl nanocrystals with edge dislocations

Cited by 10 publications

References 5 publications

Luminescence induced by elastic deformation of ZnS:Mn nanoparticles

Luminescence induced by elastic deformation of ZnS:Mn nanoparticles

A Review of Mechanoluminescence in Inorganic Solids: Compounds, Mechanisms, Models and Applications

Mechanoluminescence of Nanoparticles

Contact Info

Product

Resources

About