[20a-G203-1~11] 16.1 Fundamental properties, evaluation, process and devices in disordered materials

[20a-G203-9] Down Conversion luminescence Mechanism of Tb³⁺,Yb³⁺ codoped ZrO₂-SiO₂ Nano-crystallized Glasses

〇Tomokatsu Hayakawa¹, Masato Isogai¹, Jean Rene Duclere², Philippe Thomas² (1.Nagoya Inst. Tech., 2.Limoges Univ.)

Keywords:sol-gel glasses, photoluminescence, Energy transfer

Down-conversion (DC) materials which convert visible light to near-infrared light are a promising tool to enhance the efficiency of crystalline silicon solar cells. In this study, the wavelength conversion properties of Tb³⁺/Yb³⁺ co-doped ZrO₂-SiO₂ nano-crystallized glasses were investigated. The highest energy transfer efficiency (ETE) of 79.1% was achieved. Moreover, the DC luminescence mechanism was investigated by the dependency of DC intensity on excitation power. As a result, it was revealed that the DC mechanism was explained by a cooperative energy transfer.