Luminescence during release of pressure in X‐ray irradiated alkali halide crystals

Abstract

Emission of light is found during application as well as release of uniaxial pressure in X-ray irradiated alkali halide crystals. As unpinning of dislocations can not take place, however, dislocations can move in backward directions during release of the pressure ; the emission of light during release of pressure gives a direct support that the interaction of moving dislocations with F-centers is responsible for the emission of light during deformation of colored alkali halide crystals.Sowohl bei der Anwendung von Druck als auch bei Druckentlastung wird Lichtemission in rontgenbestrahlten Alkalihalogenidkristallen beobachtet. Da Versetzungsloslosung von F-Zentren jedoch nicht eintreten kann, konnen die Versetzungen wahrend der Druckentlastung zuriickwandern. Die Lichtemission wiihrend der Druckentlastung unterstutzt die Annahme, daB die Wechselwirkung der wandernden Versetzungen mit den F-Zentren fur die Lichtemission wiihrend der Verformung von farbigen Alkalihalogenidkristallen verantwortlich ist.

The development of mechanoluminescence from organic compounds: breakthrough and deep insight

“…It has been reported that some organic non-aromatic compounds like sugars, tartaric acid, etc., can produce ultra-violet (UV) and deep-blue emission under mechanical stimuli. 29,49 However, their ML was proved to be generated by nitrogen discharge under the electric field between the two fracture surfaces. UV luminophores are relatively rare among organic aromatic compounds, and in 2018, Yang et al reported a unique compound of BP-TPY, which exhibited deep-blue ML located in the UV region with a peak at 372 nm (Fig.…”

Survey of the literature on mechanoluminescence from 1605 to 2013

“…In the 17th century, only five papers were published on ML ; in the 18th century, 15 papers were published ; in the 19th century, 19 papers were published ; in the 20th century, ~ 372 papers were published …”

“…Only few papers are related to the investigation of EML and PML. The papers related to the studies of EML and PML are: .…”

Effects of mechanical deformation: Exoemission

“…The emission is thought to be a result of the interaction of dislocations with colour centres (Butler 1966;Shmurak 1969;Alzetta et al 1970;Guerrero and Alvarez-Rivas 1978;Chandra and Zink 1980). Recently ML emission during the application as well as the release of uniaxial compression in x-ray irradiated alkali halides have been reported by Chandra and Elyas (1978). They have also studied ~-irradiated alkali halid6s and ML emission from coloured alkali halides under repeated stress, and established a linear relationship between the ML intensity and the measured density of newly-created dislocations at the end of repeated-stress cycles (Elyas 1981).…”