Luminescent material comprising doped rare earth silicate

Abstract

The present invention relates to a material comprising a rare earth (Ln) silicate doped with an element B different from Ln selected from Ce, Pr, Tb, wherein B is at least partially in its 4+ oxidation state (B4+), the amount of B4+ in the material is comprised between 0.0001% and 0.1% by mass. This material may be a scintillation material and it may exhibit an afterglow after 100 ms of typically less than 200 ppm relative to the intensity measured during X-ray exposure. The materials are preferably co-doped. It can be obtained using oxidative annealing. It is particularly suitable for integration in ionizing particle detectors that can be used in medical imaging equipment.

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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