Alkali metal ion substitution induced luminescence enhancement of NaLaMgWO6:Eu3+ red phosphor for white light-emitting diodes

作者：Han, Bing^*; Liu, Beibei; Dai, Yazhou; Zhang, Jie; Shi, Hengzhen^*

来源：Ceramics International, 2019, 45(3): 3419-3424.

DOI：10.1016/j.ceramint.2018.10.256

• Alkali metal ion substitution
• White light-emitting diodes
• NaLaMgWO6:Eu3+
• Red-emitting phosphor

Alkali metal ion substitution is an effective strategy to improve the luminescence properties of phosphors. In this work, a series of red-emitting phosphors Na(1-x)Li(x/2)K(x/2)La(0.6)En(0.4)MgWO(6) were prepared by a traditional high temperature solid-state reaction. Their phase structure, microstructure, luminescence properties and potential application in phosphor-converted white light-emitting diodes (pc-WLEDs) were investigated in detail. X-ray diffraction (XRD) result revealed the formation of a solid solution when x <= 0.3, which kept monoclinic structure of NaLaMgWO6. Photoluminescence investigation indicated that the partial substitution of Li+/K+ ions for Na+ ions improved largely the red emission of Eu3+. Based on the optimized Na0.7Li0.15K0.15La0.6Eu0.4MgWO6 sample with relatively good thermal stability, a WLED device was fabricated by combining a near-ultraviolet (NUV) chip (similar to 400 nm) with the phosphor mixture of commercial green/blue phosphors and the optimized red phosphor. The results indicated that the optimized red phosphor in this work could be a potential candidate for WLEDs pumped by NUV chips.

• 出版日期2019-2-15
• 单位郑州轻工业大学