Yellow lighting upconversion from Yb3+/Ho3+ co-doped CaMoO4

• Published in: Materials research bulletin Vol. 47; no. 8; pp. 1991 - 1995
• Main Authors: Chung, Jun Ho, Ryu, Jeong Ho, Lee, Sang Yeop, Lee, Jeong Hoon, Choi, Bong Geun, Shim, Kwang Bo
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-08-2012
• Subjects: A. Optical materials; D. Luminescence; D. Optical properties; A. Optical materials; D. Luminescence; D. Optical properties
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2012.04.014

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► Successful synthesis of yellow UC luminescent from CaMoO4:Ho3+/Yb3+ phosphors. ► CaMoO4:Ho3+/Yb3+ exhibited strong red (656nm) and green (540nm) luminescence. ► Optimum doping concentrations of Ho3+/Yb3+ ions have been investigated to 1/16mol%.
Yellow upconversion (UC) luminescence is observed in Ho3+/Yb3+ co-doped CaMoO4 synthesized by complex citrate-gel method. Under 980nm excitation, Ho3+/Yb3+ co-doped CaMoO4 exhibited yellow emission based on green emission near 543nm generated by 4F4, 5S2→5I8 transition and strong red emission around 656nm generated by 5F5→5I8 transition, which are assigned to the intra 4f transitions of Ho3+ ions. The optimum doping concentration of Ho3+ and Yb3+ was investigated for highest upconversion luminescence. Based on pump power dependence, upconversion mechanism of Ho3+/Yb3+ co-doped CaMoO4 was studied in detail.