应用化学 ›› 2025, Vol. 42 ›› Issue (3): 365-374.DOI: 10.19894/j.issn.1000-0518.240271

• 研究论文 • 上一篇    下一篇

单颗粒上转换荧光光谱性质调控

李云扬1,2, 郑睿哲1, 周延1, 海热古·吐逊1,2(), 董彪1,3()   

  1. 1.新疆医科大学医学工程技术学院,乌鲁木齐 830054
    2.共建中亚高发病成因与防治国家重点实验室,乌鲁木齐 830054
    3.吉林大学电子科学工程学院,集成光电子学国家重点实验室,长春 130012
  • 收稿日期:2024-08-05 接受日期:2025-01-21 出版日期:2025-03-01 发布日期:2025-04-11
  • 通讯作者: 海热古·吐逊,董彪
  • 基金资助:
    维吾尔自治区自然科学基金“青年科学基金”(2022D01C727);省部共建中亚高发病成因与防治国家重点实验室“面上”项目(SKL-HIDCA-2023-15);新疆维吾尔自治区天池英才“青年基金”(0301050903)

Research on the Regulation of Upconversion Fluorescence Spectral Properties on Single Particles

Yun-Yang LI1,2, Rui-Zhe ZHENG1, Yan ZHOU1, Tu-Xun HAIREGU1,2(), Biao DONG1,3()   

  1. 1.College of Medical Engineering and Technology,Xinjiang Medical University,Urumqi 830054,China
    2.State Key Laboratory of Pathogenesis,Prevention and Treatment of High Incidence Diseases in Central Asia,Urumqi 830054,China
    3.State Key Laboratory on Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China
  • Received:2024-08-05 Accepted:2025-01-21 Published:2025-03-01 Online:2025-04-11
  • Contact: Tu-Xun HAIREGU,Biao DONG
  • About author:dongb@jlu.edu.cn
    hrg@xjmu.edu.cn
  • Supported by:
    the Natural Science Foundation of Xinjiang Uygur Autonomous Region(2022D01C727);the State Key Laboratory of Pathogenesis Prevention and Treatment of High Incidence Disease and Central Asia, Xinjiang Medical University(SKL-HIDCA-2023-15);the Talent Project of Tianchi Doctoral Program in Xinjiang Uygur Autonomous Region(0301050903)

摘要:

镧系掺杂的上转换(UC)微/纳米晶体因其独特的光学性能优势,在多个领域如显示科技、传感技术、生物影像以及药物传输等方面具有广阔的应用前景和潜力。 尽管在上转换发光领域的研究与运用已取得显著进展,但如何实现对单颗粒水平发光晶体的颜色调控,仍然是一个亟待解决的问题。 本文提出了基于热处理方法的NaYF4单颗粒晶体向Y2O3晶体的转变策略,通过原位离子交换,成功获得了原位生长的Y2O3晶体,并对其荧光、形貌、结构以及尺寸进行了表征。 研究发现,原位生长的Y2O3微米棒保留了与NaYF4相同的尺寸及形貌,元素分布及高分辨(TEM)的表征结果进一步证实了Y2O3∶Er3+/Yb3+的成功制备。 随着激发功率的增加,Er3+在NaYF4基质材料中的红光与绿光强度比(R/G)从4.5逐渐降至3.42,而在Y2O3基质材料中,该比值从0.84显著降至0.48。 表明通过晶体的原位相变,可实现Er3+在NaYF4中的上转换红光向Y2O3中明亮的上转换绿光的实时调控。 这一发现不仅拓展了单颗粒水平稀土发光晶体的研究方法,而且其单颗粒水平的多色荧光性能有望应用于精细防伪、多色成像等领域。

关键词: 稀土微米颗粒, 可调节荧光发射, 晶体结构转变, 单颗粒

Abstract:

Lanthanide-doped upconversion (UC) micro/nanocrystals have demonstrated significant application prospects in fields such as display, sensing, bioimaging, and drug delivery due to their excellent optical properties. Despite remarkable progress in upconversion luminescence research, the challenge of achieving color control at the single-particle level remains unsolved. This study proposes a strategy for transforming NaYF4 single-particle crystals into Y2O3 crystals through in-situ heat treatment. By in-situ ion exchange, Y2O3 crystals grown in-situ were successfully obtained and their fluorescence, morphology, structure, and size were characterized. The study found that the in-situ grown Y2O3 microrods retained the same size and morphology as NaYF4. The results of elemental distribution analysis and high-resolution transmission electron microscopy (TEM) further confirm the successful preparation of Y2O3∶Er3+/Yb3+. As the excitation power increases, the red-to-green intensity ratio (R/G) of Er3+ in the NaYF4 host material gradually decreases from 4.5 to 3.42, while in the Y2O3 host material, this ratio significantly drops from 0.84 to 0.48. This demonstrates that through in-situ phase transformation of the crystals, real-time modulation of the upconversion red light of Er3+ in NaYF4 towards bright upconversion green light in Y2O3 can be achieved. This research not only expands the research methods for rare-earth luminescent crystals at the single-particle level but also holds promise for the application of their multicolor fluorescence properties at the single-particle level in areas such as sophisticated anti-counterfeiting and multicolor imaging.

Key words: Rare-earth microparticles, Tunable fluorescence emission, Crystal structure transformation, Single-particle

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