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Near UV-pumped yellow-emitting Sr9MgLi(PO4)7:Eu2+ phosphor for white-light LEDs

近紫外芯片激发的白光LED用黄色荧光粉Sr9MgLi(PO4)7:Eu2+

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Abstract

Laboratory discovery of new phosphors for white-light light-emitting diodes (WLEDs) is still an imperative challenge. A new yellow-emitting Sr9MgLi(PO4)7:Eu2+ phosphor was discovered based on the mineral-inspired prototype evolution and new phase construction strategy proposed by our group. Sr9MgLi(PO4)7:Eu2+ has been synthesized by using a high temperature solid-state method, and its phase structure and luminescence properties have been investigated in detail, and applied in WLED lamp. Sr9MgLi(PO4)7 phase is derived from the β-Ca3(PO4)2-type mineral structure. Upon 365 nm UV light excitation, the Sr9MgLi(PO4)7:Eu2+ phosphor exhibits a broad emission band from 450 nm to 700 nm. The white-light LED lamp was fabricated based on the phosphor blends of the composition-optimized yellow-emitting Sr9MgLi(PO4)7:Eu2+ and commercial blue-emitting BaMgAl10O17:Eu2+, and a 365 nm UV chip was used as the excitation source. The Ra, CCT value and CIE of the as-fabricated LEDs were found to be 83, 5,612 K, and (0.324, 0.358), respectively. All the results indicate that Sr9MgLi(PO4)7:Eu2+ could be potential in the development of UV-pumped white-light LEDs.

摘要

发现新型白光LED用荧光粉一直是材料科学领域一项重要的挑战. 采用本课题组提出的矿物结构模型, 高效设计了稀土发光材料新物相, 并解析、 确定新物相的晶体结构. 本论文用黄色荧光粉Sr9MgLi(PO4)7:Eu2+设计合成了一种新型白光LED, 并对其结构和发光特性进行了分析表征. 研究发现: 其物相结构是源于β-Ca3(PO4)2矿物模型. 在365 nm近紫外光激发下, Sr9MgLi(PO4)7:Eu2+呈现出一个从450 nm到700 nm的宽带发射. 通过把Sr9MgLi(PO4)7:Eu2+黄粉与商用蓝粉BaMgAl10O17:Eu2+混合涂敷在蓝光芯片表面, 制作得到了白光LED器件. 测试结果显示, LED的Ra, CCT, CIE值分别为83, 5612 K, (0.324, 0.358), 表明Sr9MgLi(PO4)7:Eu2+可作为白光LED用黄光荧光粉.

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Acknowledgements

The present work was supported by the National Natural Science Foundation of China (51722202, 91622125 and 51572023) and Natural Science Foundation of Beijing (2172036).

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Authors and Affiliations

  1. The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Jianwei Qiao  (乔建伟), Zhiguo Xia  (夏志国), Zhichao Zhang  (张志超), Bintao Hu  (胡彬涛) & Quanlin Liu  (刘泉林)

Authors
  1. Jianwei Qiao  (乔建伟)
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  2. Zhiguo Xia  (夏志国)
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  3. Zhichao Zhang  (张志超)
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  4. Bintao Hu  (胡彬涛)
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  5. Quanlin Liu  (刘泉林)
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Corresponding author

Correspondence to Zhiguo Xia  (夏志国).

Additional information

Jianwei Qiao is a PhD student in University of Science and Technology Beijing. He completed his bachelor degree at Taiyuan Normal University in 2014 and received the master degree from Taiyuan University of Technology in 2017. His research is mainly focused on the rare earth ions activated phosphate luminescent materials for white LEDs.

Zhiguo Xia is a professor of materials chemistry and physics in University of Science and Technology Beijing (USTB). He obtained his bachelor degree in 2002 and master degree in 2005 from Beijing Technology and Business University, and he received his PhD degree from Tsinghua University in 2008. Since then he has been working as an assistant and associate Professor in China University of Geosciences, Beijing (CUGB), 2008–2014. After that, he joined USTB as a full professor. His research interests are in designing of new rare earth phosphors for white LED by integrating structural discovery, modification and structure-property relation studies.

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Qiao, J., Xia, Z., Zhang, Z. et al. Near UV-pumped yellow-emitting Sr9MgLi(PO4)7:Eu2+ phosphor for white-light LEDs. Sci. China Mater. 61, 985–992 (2018). https://doi.org/10.1007/s40843-017-9207-2

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  • DOI: https://doi.org/10.1007/s40843-017-9207-2

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