[7p-A414-1~17] 13.9 Optical properties and light-emitting devices

[7p-A414-14] Broadband-sensitive upconversion emission of Er³⁺, Ni²⁺-co-doped garnets

〇Yasuhiko Takeda¹, Luitel Hom Nath¹, Shintaro Mizuno¹ (1.Toyota Central R&D Labs.)

Keywords:upconversion, rare earth, sensitization

We designed a new material to fabricate Er³⁺, Ni²⁺-co-doped transparent ceramics exhibiting broadband-sensitive upconversion emission. The host material must be of a cubic structure like garnets for transparency. Among the octahedron sites and tetrahedron sites in a garnet, the Ni²⁺ dopants are required to occupy the former for efficient sensitization. We selected Gd₃Ga₅O₁₂ as the host material to fulfill these two requisites. The synthesized Gd₃Ga₅O₁₂:Er³⁺,Ni²⁺ powder samples exhibited upconversion emission at 0.98 um under 1.1-1.7 um excitation, like previously developed La(Ga_0.5Sc_0.5)O₃:Er³⁺,Ni²⁺.