Tuning of Photoluminescence by Cation Nanosegregation in the (CaMg)x(NaSc)1–xSi2O6 Solid Solution

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• 作者：Zhiguo Xia ; Guokui Liu ; Jianguo Wen ; Zhigang Mei ; Mahalingam Balasubramanian ; Maxim S. Molokeev ; Licong Peng ; Lin Gu ; Dean J. Miller ; Quanlin Liu ; Kenneth R. Poeppelmeier
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：February 3, 2016
• 年：2016
• 卷：138
• 期：4
• 页码：1158-1161
• 全文大小：315K
• ISSN：1520-5126

文摘

Controlled photoluminescence tuning is important for the optimization and modification of phosphor materials. Herein we report an isostructural solid solution of (CaMg)_x(NaSc)_1–xSi₂O₆ (0 < x < 1) in which cation nanosegregation leads to the presence of two dilute Eu²⁺ centers. The distinct nanodomains of isostructural (CaMg)Si₂O₆ and (NaSc)Si₂O₆ contain a proportional number of Eu²⁺ ions with unique, independent spectroscopic signatures. Density functional theory calculations provided a theoretical understanding of the nanosegregation and indicated that the homogeneous solid solution is energetically unstable. It is shown that nanosegregation allows predictive control of color rendering and therefore provides a new method of phosphor development.