物理化学学报 >> 2018, Vol. 34 >> Issue (11): 1250-1263.doi: 10.3866/PKU.WHXB201804041

所属专题: 庆祝李永舫院士七十华诞特刊

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基于碳量子点的光电器件应用新进展

贺平1,袁方龙1,王子飞1,谭占鳌2,*(),范楼珍1,*()   

  1. 1 北京师范大学化学学院,北京 100875
    2 北京软物质科学与工程高精尖创新研究中心,北京化工大学,北京 100029
  • 收稿日期:2018-03-07 发布日期:2018-04-17
  • 通讯作者: 谭占鳌,范楼珍 E-mail:tanzhanao@mail.buct.edu.cn;lzfan@bnu.edu.cn
  • 作者简介:谭占鳌,生于1978年。北京化工大学教授,博士生导师。2007年博士毕业于中国科学院化学研究所。主要研究方向是光电功能材料在新型太阳电池和电致发光二极管领域的应用|范楼珍,生于1964年。北京师范大学化学学院教授,博士生导师。1998年博士毕业于中国科学院化学研究所。主要研究方向是荧光碳量子点的合成及其在生物体系和光电器件领域的应用
  • 基金资助:
    国家自然科学基金(21233003);国家自然科学基金(21573019);中央高校基本科研业务费专项资金资助项目

Growing Carbon Quantum Dots for Optoelectronic Devices

Ping HE1,Fanglong YUAN1,Zifei WANG1,Zhanao TAN2,*(),Louzhen FAN1,*()   

  1. 1 College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
    2 Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
  • Received:2018-03-07 Published:2018-04-17
  • Contact: Zhanao TAN,Louzhen FAN E-mail:tanzhanao@mail.buct.edu.cn;lzfan@bnu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21233003);the National Natural Science Foundation of China(21573019);the Fundamental Research Funds for the Central Universities, China

摘要:

碳量子点(CQDs)作为一种新型荧光碳纳米材料,由于其较高的电子迁移率、较长的热电子寿命、极快的电子取出速度,可调的带隙宽度、较强的稳态荧光等独特的光电性质和可溶液加工、成本低廉的特点,使得CQDs在光电器件领域具有广阔的应用前景,近年来受到人们的广泛关注,重要的研究成果不断涌现。本文首先简要介绍了CQDs的合成方法、化学结构及其光电性质,然后总结了CQDs在发光二极管(LEDs)、太阳能电池(SCs)和光电探测器(PDs)等光电器件领域的研究进展,最后对CQDs的发展方向进行了展望。

关键词: 碳量子点, 合成方法, 光电性质, 发光二极管, 太阳能电池, 光电探测器

Abstract:

As new types of carbon nanomaterials, carbon quantum dots (CQDs) have received widespread attention for their potential applications in optoelectronic device owing to their unique properties such as long hot-electron lifetime, high electron mobility, tunable bandgap, strong stable florescence, solution-processability, stability, non-toxicity, and low cost. Correspondingly, there has been several interesting developments in researches focusing on CQDs. In this review, we will present an update the on the latest research on the synthesis, morphology, structural characteristics, and optoelectronic properties of CQDs. The latter are determined by quantum confinement effect and surface defects. Using bottom-up synthesis methods, CQDs with higher crystallinity and less surface defects could be obtained by accurately designing the precursors and reaction conditions. The structures could be characterized by high-resolution transmission electron microscopy. Secondly, the latest progress on photoelectric devices, including light-emitting diodes (LEDs), solar cells (SCs), and photodetectors (PDs), are summarized in detail. CQDs-based LEDs are divided into photoluminescence (PL) and electroluminescence (EL) LEDs owing to their different excitation modes. Recently, PL LEDs leveled with developed QDs-based LEDs in both luminous efficiency and color rendering index (CRI). With the discovery of their bandgap emission, CQDs overcame carrier injection, which is determined by surface defects and molecule states, and presented excellent potential in EL applications. Moreover, their broad absorption in the ultraviolet-to-visible light range and high electron mobility make CQDs preferable for improving energy conversion efficiency of SCs and responsivity of PDs. Finally, we delineate current challenges on studying CQDs. Its indefinite fluorescence mechanism and structural characterizations limit the development of CQDs. Furthermore, large-scale synthesis methods for CQDs with high quantum yields and crystallinity are not yet established, which hinders their utility in optoelectronic devices. Moreover, CQDs with narrow emission bandwidth (full width at half maximum, FWHM ≤ 35 nm) still do not exist, which restrains their applications in display and laser. Hence, researches on CQDs-based optoelectronic applications are still in the first stages of development. We hope that this review will indicate future directions and encourage critical thinking to elicit new discoveries on CQDs from both fundamental and applied researches. Consequently, the potential of environment-friendly CQDs can be realized in optoelectronics and more areas.

Key words: Carbon quantum dot, Synthesis, Optoelectronic property, Light emitting diode, Solar cells, Photodetector

MSC2000: 

  • O644