???PbSe, Lead Selenide
Lead selenide (PbSe), or lead(II) selenide, a selenide of lead, is a semiconductor material. It is used for manufacture of infrared detectors for thermal imaging, operating at wavelengths between 1.5-5.2 ?m.
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Refractive Index Reference - Optical constants of crystalline and amorphous semiconductors, Adachi, pg 628
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