Infrared emission property of (Ca, Cr) Co-DOPED YAG ceramics

Abstract

(Ca, Cr) co-doped YAG ceramics were synthesized by high temperature solid state reaction. The effects of Ca2+ and Cr3+ ions doping on the infrared emission properties of YAG ceramics were investigated. X-ray diffraction results showed that the phase composition of the prepared samples were yttrium aluminum garnet, which indicated that the Ca2+ and Cr3+ irons were incorporated into the crystal lattice of yttrium-aluminate garnet structure. Infrared absorption results showed that the infrared absorptivity of the (Ca, Cr) co-doped samples was 0.90, which was 29 times higher than that of the pure YAG sample (0.03). The band gap of YAG ceramics were decreased 1.77 eV by Ca2+ and Cr3+ co-doping based on calculation of the absorbance test results. Therefore, the absorption of the free carrier was improved, which is the main reason why the (Ca, Cr) co-doping YAG ceramics have a high emissivity in near infrared wavelength.