Gadolinium oxysulfide

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Gadolinium oxysulfide (Gd₂O₂S), also called gadolinium sulfoxylate or GOS, is an inorganic compound, a mixed oxide-sulfide of gadolinium. Its CAS number is [12339-07-0].

Terbium-doped gadolinium oxysulfide is frequently used as a scintillator for x-ray imaging. It emits wavelengths between 382-622 nm, though the primary emission peak is at 545 nm. It is also used as a green phosphor in projection CRTs, though its drawback is marked lowering of efficiency at higher temperatures.[1]

Variants include eg. using praseodymium instead of terbium (CAS number [68609-42-7], EINECS number 271-826-9), or using a mixture of dysprosium and terbium for doping (CAS number [68609-40-5], EINECS number 271-824-8).