Crystal Structure of High-Temperature Phase β-NaSrBO3 and Photoluminescence of β-NaSrBO3:Ce3+

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• 作者：Huan Yi ; Li Wu ; Liwei Wu ; Lixia Zhao ; Zhiguo Xia ; Yi Zhang ; Yongfa Kong ; Jingjun Xu
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：July 5, 2016
• 年：2016
• 卷：55
• 期：13
• 页码：6487-6495
• 全文大小：643K
• 年卷期：0
• ISSN：1520-510X

文摘

α-NaSrBO₃ is an excellent phosphor host for phosphor-converted white light-emitting diode (w-LED) application with very interesting properties. However, it undergoes a phase transformation to β-NaSrBO₃ at the LED working temperature. In this study, the high-temperature phase β-NaSrBO₃ was stabilized to room temperature by introducing Na⁺ and Ce³⁺ via a high-temperature solid-state reaction method. The crystal structure of β-NaSrBO₃ was determined from the powder X-ray diffraction data. It crystallizes in space group P2₁/c with the following lattice parameters: a = 6.06214(8) Å, b = 5.41005(7) Å, c = 9.1468(1) Å, β = 102.116(1)°, and V = 293.301(7) ų. Na and Sr sites are found to be mixed occupied by each other, and the isolated [BO₃]^3– anionic groups are distributed in parallel. Ce³⁺-activated β-NaSrBO₃:Ce³⁺ blue-emitting phosphors were synthesized. The temperature-dependent photoluminescence spectra indicate that the thermal stability of β-NaSrBO₃:Ce³⁺ is better than that of α-NaSrBO₃:Ce³⁺ at the same temperature. A near-ultraviolet pumped warm w-LED with a β-NaSrBO₃:0.05Ce³⁺ phosphor as the blue component was fabricated. The w-LED lamp after illumination at 250 mA gives chromaticity coordinates, a color rendering index, and a correlated color temperature of (0.3821, 0.3430), 92.8, and 3654 K, respectively.