光子学报 ›› 2019, Vol. 48 ›› Issue (10): 1016001-1016001.doi: 10.3788/gzxb20194810.1016001

• 材料 • 上一篇    下一篇

水热法合成Ag-In-Zn-S绿色四元量子点及其荧光性能研究

陈婷1,2, 胡晓博3, 徐彦乔1, 江伟辉1,2, 江莞2,3, 谢志翔1   

  1. 1. 景德镇陶瓷大学 材料科学与工程学院, 江西 景德镇 333001;
    2. 国家日用及建筑陶瓷工程技术研究中心, 江西 景德镇 333001;
    3. 东华大学 材料科学与工程学院, 上海 201620
  • 收稿日期:2019-07-11 出版日期:2019-10-25 发布日期:2019-08-27
  • 通讯作者: 谢志翔(1982-),男,副教授,博士,主要研究方向为新能源材料.Email:xzx821016@126.com E-mail:xzx821016@126.com
  • 作者简介:陈婷(1984-),女,副教授,博士,主要研究方向为荧光材料.Email:chenting@jci.edu.cn
  • 基金资助:

    国家自然科学基金(Nos.51402135,51432004,51774096),江西省杰出青年人才资助计划(No.20171BCB23071),江西省自然科学基金(Nos.20181BAB216009,20171BAB216008),江西省教育厅基金项目(Nos.GJJ180708,GJJ180707)

Hydrothermal Synthesis and the Study of Fluorescence Properties of Quaternary Ag-In-Zn-S Quantum Dots

CHEN Ting1,2, HU Xiao-bo3, XU Yan-qiao1, JIANG Wei-hui1,2, JIANG Wan2,3, XIE Zhi-xiang1   

  1. 1. School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi 333001, China;
    2. National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen, Jiangxi 333001, China;
    3. College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
  • Received:2019-07-11 Online:2019-10-25 Published:2019-08-27
  • Contact: 2019-08-27 E-mail:xzx821016@126.com
  • Supported by:

    The National Natural Science Foundation of China (Nos.51402135, 51432004, 51774096), Fund for Distinguished Young Scholars of Jiangxi Province (No.20171BCB23071), the Projects of Jiangxi Provincial Department of Science and Technology (Nos.20181BAB216009, 20171BAB216008), Science Foundation of Jiangxi Provincial Department of Education (Nos.GJJ180708, GJJ180707)

摘要:

以无机金属盐为原料、谷胱甘肽(GSH)和柠檬酸钠(SC)为配体,通过水热法制备了AIZS量子点.系统研究了pH值、Ag/In比例、Ag/Zn比例对AIZS量子点的合成及其荧光性能的影响,并通过X射线衍射仪、透射电子显微镜、红外光谱、紫外-可见吸收光谱以及光致发光光谱分别对样品的结构、形貌和荧光性能进行了表征.实验结果表明,通过水热法可以制备出具有优异荧光性能的AIZS四元绿色量子点.随着pH值的增加(pH值=7~9),配体GSH和SC有效地钝化了AIZS量子点的表面缺陷,显著提高了其荧光强度.当Ag/In比例为1:1~1:11范围内,量子点发光峰的中心位置覆盖632.1 nm~588.9 nm;当Ag/In=1:7时,AIZS量子点的量子产率高达27.3%.此外,随着Ag/Zn比例从1:0.5减小至1:3.0,量子点的合金化效应逐渐增强,使其发光峰位从604.1 nm蓝移至581.5 nm;当Ag/Zn=1:1.5时,AIZS量子点的发光强度达到最大值,量子产率进一步提升至35.3%,说明Zn2+的引入具有稳定AIZS量子点的晶格以及抑制非辐射复合效应的作用,从而显著提高量子点的荧光性能.在200 mA的电流驱动下,AIZS量子点基白光LED的光效可达60.8 lm/W,显色指数高达80.1,色坐标为(0.29,0.35),说明AIZS四元量子点在照明领域具有良好的应用前景.

关键词: 荧光强度, 水热法, 发光峰位, 量子点, 量子产率

Abstract:

Ag-In-Zn-S quantum dots (AIZS QDs) were prepared by hydrothermal method using inorganic metal salts as raw materials, Glutathione (GSH) and Sodium Citrate (SC) as ligands. The effects of pH values, Ag/In and Ag/Zn ratios on phase, morphology, and fluorescence properties were systematically investigated, and the phase, morphology and fluorescence properties of AIZS QDs were characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, Ultraviolet and visible absorption spectra, photoluminescence spectra, respectively. The results showed that the AIZS QDs with excellent fluorescence properties could be prepared via green and facile hydrothermal method. The surface defects of AIZS QDs could be effectively passivated by ligands with the increase of pH values (pH=7~9), resulting in the enhanced emission intensity. Moreover, the emission wavelength of AIZS QDs located the range of 632.1 nm~588.9 nm with the Ag/In ratios of 1:1~1:11, and their Quantum Yields (QYs) could reach up to 27.3% with the Ag/In ratio of 1:7. Furthermore, the emission peak showed a systematic blue-shift from 592.5 nm to 570.3 nm by varying the Ag/Zn ratio from 1:0.5 to 1:3.0 due to the increased alloying effect. AIZS QDs exhibited the strongest emission and the maximum QYs of could be further increased to 35.3% with the Ag/Zn ratio of 1:1.5, indicating that the incorporation of Zn2+ could effectively improve the fluorescence properties of AIZS QDs by stabilizing the lattice and suppressing the non-radiative recombination. Under the forward bias current of 200 mA, the AIZS QDs-based white light-emitting diode (WLED) exhibited a high Color Rendering Index (CRI) of 80.1, Luminous Efficiency (LE) of 60.8 lm/W with the Commission Internationale de I'Eclairage (CIE) color coordinate of (0.29, 0.35), demonstrating the prospective application of obtained QDs in solid-state lighting devices.

Key words: Emissive peak, Quantum dot, Quantum yield, Fluorescence intensity, Hydrothermal method

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