[14p-411-1~14] 13.9 Optical properties and light-emitting devices

[14p-411-9] Er³⁺, Ni²⁺-co-doped broadband-sensitive upconverters for solar energy harvesting

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

Keywords:upconversion, sensitization, crystalline silicon solar cells

We have realized upconversion from 1.1-1.6 um photons to 0.98 um using perovskite materials like La(Ga,Sc)O₃ co-doped with Er³⁺ and Ni²⁺. 1.1-1.45 um photons are absorbed by the Ni²⁺ sensitizers, followed by energy transfer to the Er³⁺ emitters. Tuning the compositions of the host perovskites realized a high efficiency of the energy transfer close to unity, with suppressing back transfer from the Er³⁺ to the Ni²⁺.