Relaxation in an amorphous solid and the isothermal recombination luminescence following photoionization
✍ Scribed by J. Bullot; D. Ceccaldi
- Publisher
- Elsevier Science
- Year
- 1970
- Tongue
- English
- Weight
- 241 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
It is shown that relaxation processes in the amorphous solid intervene significantly on the recombination luminescence (ITL) by modifying the decay kinetics. A single parameter which scales both the magnitude and the time coordinate of the lTL seen In a fully relaxed solid is &able of predicting the time course of the I'I'L seen in a partially relaxed solid. The one-parameter scaling relationship is the same es the one previously developed for predicting lTL behavior when the solid is subjected to some homogeneous perturbation. A key to the understanding of photo-ionization processes ir. a rigid matrix is the knowledge of the exact nature of electron traps and the distribution of ejected electrons, among these traps, after ultraviolet irradiation. Undoubtedly, such a knowledge would shed some light on the basic recombination processes like the electron-cation recombination, giving rise to the long-lived isothermal luminescence (for short ITL], which takes place in a non-polar system like the typical TMPD/3-MP ** solution at 77OK. Electron trapping is evidently due to the particularly disordered structure existing in a solid near or below its glass temperature and any effort at studying this property should rest strongly on a theory of glass structure. Nevertheless, it is conceivable to consider an electron trap as an intermolecular hole, acting as an energy mi-