[9p-N205-1~8] 13.8 Optical properties and light-emitting devices

2:15 PM - 2:30 PM JST(5:15 AM - 5:30 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[9p-N205-4] Potential of Eu³⁺-Doped CaCO₃ Phosphor for Luminescence Thermometry

〇(D)Hirohisa Miyata¹, Yuichi Hirai², Takayuki Nakanishi², Jumpei Ueda¹ (1.JAIST, 2.NIMS)

Keywords:

phosphor,Eu3+,supra-ceramics

A luminescent thermometer is a non-contact device that measures temperature based on the temperature dependence of a probe's luminescence properties, such as fluorescence intensity, lifetime, or wavelength. This study focuses on the intensity ratio of emissions from different excited states. Calcite, the stable phase of CaCO₃, has a layered structure composed of molecular CO₃^2- ions. With increasing temperature, these ions rotate and lose orientation, leading to a phase transition. In Eu³⁺-doped CaCO₃, the ⁵D₀-⁷F₁ transition is a magnetic dipole (MD), while ⁵D₀-⁷F₂ is an electric dipole (ED). The MD transition is relatively insensitive to the local environment, whereas the ED transition is highly sensitive to structural changes. This study proposes using the temperature-induced variation in the ED/MD intensity ratio as a thermometric parameter, exploring the potential of Eu³⁺-doped CaCO3 as a luminescent thermometer and examining how molecular anions influence luminescence behavior.