Microstructure investigation and multicolor upconversion in Yb3+/Ln3+(Ln=Er/Tm/Ho) ions doped α-Sial

• 作 者: Sang Hoon Jeong Yuwaraj K. Kshetri Seung Ho Kim Sung Hun Cho Soo W. Lee
• 机 构: Department of Environment and Bio-Chemical Engineering, Sun Moon University, Chungnam, 31460, Republ
• 出 处: 自然科学进展（英文版）
• 发表日期: 2019年5期
• 关键词: α-Sialon rHot press sinterin rUpconversn Energy transfer

Yb3+/Ln3+(Ln=Er/Tm/Ho)-α-sialon ceramics were fabricated by hot press sintering technique. Their micro-structure and luminescent properties were studied by XRD, EDS, HRTEM and photoluminescence measurements. The results showed that the sintered ceramics consisted ofα-Sialon with a trace amount ofβ-Sialon phase. The frequency upconversion and downconversion properties of Yb3+/Ln3+(Ln=Er/Tm/Ho)-α-Sialon ceramics were investigated under 980 nm low-power excitation. The different concentrations of Yb3+/Ln3+(Ln=Er/Tm/Ho) produced multicolor emissions characteristics of each Ln3+ion as a result of the energy transfer from Yb3+to Er3+, Tm3+and Ho3+ions. The EDS spectra measurements and mappings showed that the Ln3+ions were well incorporated in the α-Sialon matrix. Temporal evolution of the emission decay behavior has been in-vestigated to understand the energy transfer mechanism.