Luminescence spatial characteristics of ZnSe:Fe

Abstract

Two types of thermal-diffusion-based technological routes have been realized to obtain ZnSe:Fe plates demanded for laser application in the mid-IR spectral range. For the technological routes used, the iron doping process is shown to lead to the formation of auxiliary luminescence bands including (1) luminescence of residual tetrahedral donors and acceptors; (2) unknown bound exciton line located at 459 nm; (3) broad bands with maxima at 490, 520, 670, and 820 nm; and (4) IR band at 960 nm previously assigned to centers related to transition metals. Using the measurements of photoluminescence under conditions of two-photon excitation and measurements of low-temperature microphotoluminescence, the intensity profiles of the bands have been shown to be uncorrelated with the concentration profile of the optically active (Fe2+) iron. This trend does not depend on the technological routes used. Thus, heavily Fe doped areas, as well as adjacent regions in ZnSe:Fe plates produced by thermal-diffusion-based techniques, contain auxiliary centers governing luminescence in visible and near IR spectral ranges. These centers are not directly related to the optically active (Fe2+) iron.

Flux growth of optical sensor zinc selenide crystals

“…Several flight experiments of NASA Marshall Space Flight Center led by Su et al [5] show that thermal and diffusional convention play very important role in controlling the quality. The details of mechanism [6,7] of iron and chromium doped ZnSe indicated that transition metals have great potential to replace rare-earth dopants. In addition, since the emission depends on concentration of dopants, higher dopant concentration enhances the convector-diffusive process and hence possibility of point and line defects increases significantly.…”

Application of confocal laser scanning microscopy to investigation of micro crystals in transparent amorphous media: photoluminescence tomography and spectroscopy of CdZnSSe crystallites in historical silicate glass

“…In the last decade, a series of works on the exploration of PL spatial distribution in bulk ZnSe crystals appeared (see, e.g., Refs [24,25,26,51,52,53]…”