Recovery process of photochromism of H2 and H3 centres in diamond

Y. Mita, Y. Ohno, Y. Adachi, H. Kanehara, Y. Nisida, T. Nakashima

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

To elucidate the mechanism of photochromism of H2 and H3 centres, i.e. H2(H3-) + X+ + h {combining short stroke overlay}ω → H3 + X0, a study has been made of the recovery process of optical absorption and the photosensitive electron spin resonance (ESR) and thermoluminescence. The ESR measurement indicates that the neutral state concentration of nitrogen is increased by illumination. This fact gives evidence for one of the unknown traps X+ to be ascribed to ionized nitrogen, N+. The glow curve in thermoluminescence after photoexcitation denotes the existence of at least four traps besides N+. The recovery appears logarithmic with respect to time and is faster when the concentration of remaining neutral nitrogen is larger. The recovery rate is almost independent of temperature below 420 K, while it increases with increasing temperature above 420 K. As a result, it has been concluded that the dominant process of the recovery arises via the tunnelling of an electron from a neutral nitrogen atom to an H3 centre rather than via the thermal release of a trapped electron.

Original languageEnglish
Pages (from-to)768-772
Number of pages5
JournalDiamond and Related Materials
Volume2
Issue number5-7
DOIs
Publication statusPublished - 1993 Apr 13
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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