Ⅰ-Ⅲ-Ⅵ_(2)族量子点制备与发光二极管器件

Preparation of GroupⅠ-Ⅲ-Ⅵ_(2) Quantum Dots and Light-Emitting Diode Devices

量子点由于独特光电性质使其成为高色域、柔性、大面积显示以及医疗等领域的理想发光材料,与二元Ⅱ-Ⅵ族或Ⅲ-Ⅴ族量子点相比,Ⅰ-Ⅲ-Ⅵ_(2)族量子点不含Cd、Pb元素,对生态环境友好,具有带隙可调、斯托克斯位移大和发光寿命长等显著优点,并且通过改变化学元素组成可以在可见光到近红外光区连续调节其发射光谱。这使它们在发光二极管、太阳能电池、光电探测器、生物成像等领域具有广阔的应用前景。本文系统综述了量子点以及适于Ⅰ-Ⅲ-Ⅵ_(2)族量子点合成方法和光学性能优化策略,根据电子能带结构特征阐述了Ⅰ-Ⅲ-Ⅵ_(2)族量子点发光机制,概括了近些年量子点在照明显示器件领域的应用,并重点总结了Ⅰ-Ⅲ-Ⅵ_(2)量子点在光致与电致发光二极管的应用进展,最后对Ⅰ-Ⅲ-Ⅵ_(2)族量子点的发展前景和面临的挑战进行了展望。

Quantum dots are considered as ideal luminescent materials for high color gamut,flexible,and large area display,medical devices,and the application of other fields,due to their unique photoelectric properties.Compared with the quantum dots of binaryⅡ-Ⅵo rⅥ-Ⅴgroup,the quantum dots of ternaryⅠ-Ⅵ-Ⅵ_(2) group have significant advantages in terms of ecological and environmental friendliness without containing Cd or Pb elements,large Stokes shift with adjustable band gap,long-life luminescence,etc.Moreover,it is facile to obtain emission wavelength adjustable continuously from visible to near-infrared region by changing chemical elements ratio in the composition of singleⅠ-Ⅵ-Ⅵ_(2) family.These characters make theⅠ-Ⅵ-Ⅵ_(2) quantum dots have broad application prospects in the fields of light-emitting diodes,solar cells,photodetectors,biological imaging,etc.This paper systematically reviews the synthesis methods and optical performance optimization strategies of quantum dots and those suitable for Ⅰ-Ⅲ-Ⅵ_(2) quantum dots,explains the luminescence mechanisms of Ⅰ-Ⅲ-Ⅵ_(2) quantum dots based on their electronic band structures,summarizes recent-years progress of quantum dots application in lighting and display devices,and focuses on the application progress of the Ⅰ-Ⅲ-Ⅵ_(2) quantum dots in photo-and electroluminescent diodes.Finally,the future prospects and challenges of Ⅰ-Ⅲ-Ⅵ_(2) quantum dots are prospected.