Synthesis and photoluminescence of highly enhanced green-emitting LaNbTiO₆:xEr³⁺, yBi³⁺ micro/nanophosphors

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• 作者：Qian Ma^a ; Mengkai Lu^b ; Zhimin Yuan^a ; Yuanna Zhu^a ; Ping Yang^a ; ^{mse_yangp@ujn.edu.cn}
• 关键词：A. Optical materials ; A. Inorganic compounds ; D. Luminescence ; D. Optical properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 出版时间：December, 2012
• 年：2012
• 卷：47
• 期：12
• 页码：4126-4130
• 全文大小：1203 K

文摘

In this paper, we provided a new green-emitting LaNbTiO₆:xEr³⁺, yBi³⁺ micro/nanophosphors with good photoluminescence (PL) performance synthesized by a modified sol-gel combustion method for the first time. Down-converted luminescence from Er³⁺, Bi³⁺ co-doped into the LaNbTiO₆ host was observed under UV light excitation, in which the strongest emission peaks centered at 525 and 548 nm are attributed to the ²H_11/2 ¡ú ⁴I_15/2 and ⁴S_3/2 ¡ú ⁴I_15/2 transitions of Er³⁺, respectively. The greatly enhanced luminescence of LaNbTiO₆:xEr³⁺, yBi³⁺ phosphors can be derived from the effective Bi³⁺ ¡ú Er³⁺ energy transfer process, of which the mechanism is mainly related to the exchange interaction. CIE chromaticity coordinates for LaNbTiO₆:xEr³⁺, yBi³⁺ phosphors could be tunable in green spectral region by controlling the concentration of Bi³⁺ ions. It is also affirmed from the high brightness fluorescence images that LaNbTiO₆:xEr³⁺, yBi³⁺ phosphors could be the promising candidates for use in white LEDs application.