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Carbon dots embedded in lead-free luminescent metal halide crystals toward single-component white emitters

内嵌碳点的无铅金属卤化物单晶用于单组分白光发 射体

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Abstract

The development of single-component white emitters for white light-emitting diodes (WLEDs) remains challenging. Herein, a rare earth-free white light-emitting composite is developed by assembling blue-emitting carbon dots (CDs) and yellow-emitting Cs2InCl5·H2O:Sb3+ metal halide crystals via a facile liquid-liquid diffusion-assisted crystallization approach. The encapsulation mechanism is then analyzed. Depending on the ratios of blue/yellow emitters, these luminescent composites exhibit white light emission with tunable cold and warm hues. The composites also possess prominent ultraviolet resistance, thermal tolerance, and good stability at about 200°C. By employing such “CDs in metal halide” composites as a converter, a WLED is successfully fabricated with a high color rendering index of 93.6, benefiting from the assembled blue and yellow broadband emission. With this strategy, the developed composites show great promise in next-generation WLED lighting.

摘要

白光发光二极管(WLED)照明光源的发展对于降低能源消耗具 有重要意义. 然而, 常用的基于荧光粉转换技术的WLED器件存在自吸 收严重、显色指数低和稀土元素供应风险等多方面的不足. 对此, 本文 通过组装蓝光碳点(CDs)和无铅黄光金属卤化物(Cs2InCl5·H2O:Sb3+), 开发了一种新的单组分白光发射材料. 采用液-液扩散辅助结晶方法, 本工作成功地将CDs嵌入到Cs2InCl5·H2O:Sb3+晶体中, 复合材料呈现出 白光发射. 调节CDs和Cs2InCl5·H2O:Sb3+的比例可实现冷/暖色调可调. 使用这种“内嵌CDs的卤化物晶体”复合材料作为转换器, 我们成功制造 出单一体系WLED, 其显色指数(CRI)高达93.6, 为下一代室内高品质 WLED照明光源提供了一种便捷有效的策略.

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Acknowledgements

This work was supported by the National Natural Science Foundations of China (51961145101), Guangzhou Science & Technology Project (202007020005), the Project Supported by Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (GDUPS, 2018) for Prof. Bingfu Lei, the National Key R&D Program of China (2020YFB0407902), Guangdong Provincial Science & Technology Project (2021A0505050006 and 2021B0707010003), and Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (2021KJ122).

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Authors and Affiliations

  1. The Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China

    Weibin Chen  (陈炜彬), Wei Li  (李唯), Xuejie Zhang  (张学杰) & Bingfu Lei  (雷炳富)

  2. The State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641, China

    Weibin Chen  (陈炜彬) & Zhiguo Xia  (夏志国)

  3. Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Maoming, 525100, China

    Wei Li  (李唯), Xuejie Zhang  (张学杰) & Bingfu Lei  (雷炳富)

  4. School of Optoelectronic Engineering and CQUPT-BUL Innovation Institute, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China

    Chonggeng Ma  (马崇庚)

Authors
  1. Weibin Chen  (陈炜彬)
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  2. Wei Li  (李唯)
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  3. Xuejie Zhang  (张学杰)
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  4. Chonggeng Ma  (马崇庚)
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  5. Zhiguo Xia  (夏志国)
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  6. Bingfu Lei  (雷炳富)
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Contributions

Chen W designed and engineered the samples; Zhang X and Ma C guided the characterization and optimization of the materials; Chen W and Li W performed the experiments; Chen W wrote the paper with support from Xia Z and Lei B. All authors contributed to the general discussion.

Corresponding authors

Correspondence to Zhiguo Xia  (夏志国) or Bingfu Lei  (雷炳富).

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Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary information

Supporting data are available in the online version of the paper.

Weibin Chen was previously a master’s student in Prof. Bingfu Lei’s group at South China Agricultural University and is now studying as a PhD candidate at the State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, under the supervision of Prof. Zhiguo Xia. His research involves inorganic luminescent materials and LED/LD devices.

Zhiguo Xia is currently a professor at the South China University of Technology. He obtained his bachelor’s degree in 2002 and master’s degree in 2005 from Beijing Technology and Business University, and his PhD degree from Tsinghua University in 2008. His research interests are designing new rare-earth phosphors and luminescent metal halides for emerging photonics applications by integrating structural discovery, modification, and structure-property relation studies.

Bingfu Lei is currently a professor at the College of Materials and Energy, South China Agricultural University. He obtained his PhD degree in 2007 in condensed matter physics from Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences. His research focuses on luminescent materials synthesis and the application of luminescent materials in agriculture and display.

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Chen, W., Li, W., Zhang, X. et al. Carbon dots embedded in lead-free luminescent metal halide crystals toward single-component white emitters. Sci. China Mater. 65, 2802–2808 (2022). https://doi.org/10.1007/s40843-022-2009-y

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