Luminescent material comprising a doped rare earth silicate

Abstract

The invention relates to a material comprising a rare earth (Ln) silicate doped with an element B different from Ln, B being chosen among Ce, Pr, Tb, wherein B is at least partially in its 4+ oxidation state (B4+), the quantity of B4+ in said material being comprised between 0.0001 % and 0.1 % in mass. This material may be a scintillating material and may present an afterglow of generally less than 200 ppm after 100 ms relative to the intensity measured during an X-ray irradiation. It is preferably codoped. It may be obtained using an oxidizing annealing. It is particularly suited to integration in an ionizing particle detector that may be used in a medical imaging apparatus.

Description

technical field [0001] The invention relates to luminescent materials, including scintillation materials; to a production method for obtaining them and to the use of said materials, especially in gamma-ray and / or X-ray detectors and in monochromatic light-emitting devices (lasers). Background technique [0002] Doped rare-earth silicate compounds are known to be efficient light-emitting materials when converting UV or IR excitation to re-emission spectrum (upconversion), if the excited state population is inverted in the doped crystalline matrix (laser emission) occurs, eg for electro-optic or optoelectronic or lighting applications, then the re-emission spectrum is eg monochromatic. The goal is to obtain the highest possible re-emission light rate with the desired spectral characteristics. [0003] Flickering is a phenomenon that belongs to the broad field of luminescence. Scintillation materials are widely used in detectors that detect gamma rays, X-rays, cosmic rays, an...

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Problems solved by technology

For example, increasing light output intensity may result in more afterglow or longer decay times

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