Bright orange upconversion in a ZnO-TiO₂ composite containing Er³⁺ and Yb³⁺

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• 作者：Hom Nath Luitel ; Kazuya Ikeue ; Risa Okuda ; Rumi Ch ; Toshio Torikai ; Mitsunori Yada ; Takanori Watari
• 关键词：Upconversion ; Orange luminescence ; ZnO&ndash ; TiO2 composite ; Er3+&ndash ; Yb3+
• 刊名：Optical Materials
• 出版年：January, 2014
• 年：2014
• 卷：36
• 期：3
• 页码：591-595
• 全文大小：1309 K

文摘

ZnO-TiO₂ composite system containing Er³⁺ and Yb³⁺ were prepared by solid state reaction method and its upconversion (UC) luminescence excited by 980 nm laser was studied for the first time. The effects of firing temperature, ZnO/TiO₂ composition and Er³⁺, Yb³⁺ concentrations on the UC emission behavior were examined. The ZnO-TiO₂ composite product sintered at 1200 掳C contained Zn₂TiO₄, TiO₂ and RE₂Ti₂O₇ (RE = Er³⁺ and Yb³⁺) phases and exhibited strong green and red emissions arising due to the ²H_11/2, ⁴S_3/2 鈫?#xA0;⁴I_15/2 and ⁴F_9/2 鈫?#xA0;⁴I_15/2 transitions for Er³⁺ ion, respectively. Bright orange color by the mixing of green and red colors was observed in the 1ZnO-1TiO₂ product doped with 2 at.% Er³⁺ and 6 at.% Yb³⁺. The ZnO-TiO₂:Er³⁺, Yb³⁺ phosphor was compared to the brightest available phosphor, Y₂O₃:Er³⁺, Yb³⁺ and found to be 3-fold brighter than it. It suggests that ZnO-TiO₂:Er³⁺, Yb³⁺ is a potential material for the orange upconversion phosphor.