Jia Haoran, Wang Fuzhi, Tan Zhan'ao
Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China.
Nanoscale. 2020 Jul 2;12(25):13186-13224. doi: 10.1039/d0nr02074e.
Colloidal quantum dots (QDs) have attracted extensive attention due to their excellent optoelectronic properties, such as high quantum efficiency, narrow emission peaks, high color saturation, high stability and solution processability. Compared with the traditional display technology, QD based light-emitting diodes (QLEDs) show broad application prospects in the field of flat-panel displays and solid-state lighting. However, for full-color displays, the efficiency and lifetime of blue QLEDs are inferior to those of their green and red counterparts. Therefore, it is urgent for us to deeply understand the device physics and improve the performance of blue QLEDs through material and device engineering. An in-depth understanding of the optoelectronic properties (such as the structure of electronic states, electron-phonon interactions, Auger processes, etc.) and material engineering (such as size distribution control, composition control, and surface engineering) of blue emission QDs is greatly helpful for their applications in other fields. Herein, we review the key progress in the area of blue QLEDs, including the compositions and nanostructures of blue quantum dots, advances in the device architectures and the improvement of the device lifetime of blue QLEDs. The key factors that influence the blue device performance, including the nanostructure design and surface modification of QDs, interface engineering and architecture design of devices are discussed, aiming to propose possible solutions for these challenges, which will help to promote the commercialization process of QLEDs.
胶体量子点（QDs）因其优异的光电性能而备受关注，如高量子效率、窄发射峰、高色彩饱和度、高稳定性和溶液可加工性。与传统显示技术相比，基于量子点的发光二极管（QLEDs）在平板显示和固态照明领域展现出广阔的应用前景。然而，对于全彩显示而言，蓝色QLEDs的效率和寿命低于其绿色和红色同类产品。因此，我们迫切需要深入了解器件物理，并通过材料和器件工程来提高蓝色QLEDs的性能。深入了解蓝色发射量子点的光电性能（如电子态结构、电子-声子相互作用、俄歇过程等）和材料工程（如尺寸分布控制、成分控制和表面工程）对其在其他领域的应用有很大帮助。在此，我们综述了蓝色QLEDs领域的关键进展，包括蓝色量子点的组成和纳米结构、器件架构的进展以及蓝色QLEDs器件寿命的提高。讨论了影响蓝色器件性能的关键因素，包括量子点的纳米结构设计和表面修饰、器件的界面工程和架构设计，旨在为这些挑战提出可能的解决方案，这将有助于推动QLEDs的商业化进程。
