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Redefinition of Crystal Structure and Bi3+ Yellow Luminescence with Strong Near-Ultraviolet Excitation in La3BWO9:Bi3+ Phosphor for White Light-Emitting Diodes

荧光粉 发光 材料科学 晶体结构 光致发光 结构精修 原硅酸盐 激发态 激发 结晶学 紫外线 离子 光电子学 原子物理学 物理 化学 纳米技术 量子力学 正硅酸乙酯
作者
Jin Han,Fengjuan Pan,Maxim S. Мolokeev,Junfeng Dai,Mingying Peng,Weijie Zhou,Jing Wang
出处
期刊:ACS Applied Materials & Interfaces [American Chemical Society]
卷期号:10 (16): 13660-13668 被引量:153
标识
DOI:10.1021/acsami.8b00808
摘要

Bi3+-activated photonic materials have received increased interest recently because they can be excited effectively with near-ultraviolet (NUV) but not visible light, thereby avoiding the reabsorption among phosphors, which cannot be solved intrinsically by traditional rare earth (e.g., Eu2+, Ce3+) phosphors. Such unique property suggests their potential application in NUV chip-based WLEDs. However, few Bi3+ phosphors exhibit strong excitation peak in NUV, though the excitation tail of some can extend to NUV. Herein, we report a novel yellow-emitting La3BWO9:Bi3+ (LBW:Bi3+) phosphor with strong NUV excitation. The photoluminescence (PL) spectroscopy analysis indicates that there are two Bi3+ luminescent centers in LBW:Bi3+ phosphor, which is clearly in contradiction with the established hexagonal structure of La3BWO9 with P63 space group because only one La site in this structure can accommodate Bi3+ ions. Combining the luminescent properties of Bi3+ with Rietveld refinement, La3BWO9 was redefined as a trigonal structure with the lower space group of P3 in which there are two independent crystallographic La sites. In addition, the rationalization of P3 space group was further confirmed by the finding of the reflection (0001) according to the extinction rule. Therefore, the PL behavior of Bi3+ can act as a complementary tool to determinate the real crystal structure especially when it is hard to distinguish by conventional X-ray diffraction techniques.
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