[9a-E218-1~10] 13.8 Optical properties and light-emitting devices

9:15 AM - 9:30 AM JST(12:15 AM - 12:30 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[9a-E218-2] Effects of carbon addition of Cr₂O₃-Na₂O-CaO-GeO₂ near-infrared glass ceramic phosphor

〇Moe Suzukawa¹, Yasushi Nanai¹, Seiya Shimono², Nobuaki Kitazawa¹ (1.National Defense Academy, 2.JASRI)

Keywords:

Near-infrared,glass ceramic,phosphor

The effect of carbon addition on the luminescence properties and valence state of chromium ions in Cr₂O₃–Na₂O–CaO–GeO₂ glass-ceramic phosphors was investigated. XRD analysis revealed that the precipitated phase was assigned to Na₂CaGe₆O₁₄. Diffuse reflectance spectra and XAFS confirmed the reduction of Cr⁶⁺, Cr⁴⁺ species. All samples exhibited a broad emission band in the range of 650–1200 nm, attributed to the ^₄T₂→⁴A₂ transition of Cr³⁺. Furthermore, the quantum yield was improved compared to the carbon-free sample, indicating that carbon addition is effective in enhancing the luminescence properties.