Moon Hyungsuk, Lee Changmin, Lee Woosuk, Kim Jungwoo, Chae Heeyeop
School of Chemical Engineering, Sungkyunkwan University (SKKU), Seoburo 2066, Jangan-gu, Suwon, Gyeonggi-do, 16419, Republic of Korea.
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU), Seoburo 2066, Jangan-gu, Suwon, Gyeonggi-do, 16419, Republic of Korea.
Adv Mater. 2019 Aug;31(34):e1804294. doi: 10.1002/adma.201804294. Epub 2019 Jan 16.
Quantum dots (QDs) are being highlighted in display applications for their excellent optical properties, including tunable bandgaps, narrow emission bandwidth, and high efficiency. However, issues with their stability must be overcome to achieve the next level of development. QDs are utilized in display applications for their photoluminescence (PL) and electroluminescence. The PL characteristics of QDs are applied to display or lighting applications in the form of color-conversion QD films, and the electroluminescence of QDs is utilized in quantum dot light-emitting diodes (QLEDs). Studies on the stability of QDs and QD devices in display applications are reviewed herein. QDs can be degraded by oxygen, water, thermal heating, and UV exposure. Various approaches have been developed to protect QDs from degradation by controlling the composition of their shells and ligands. Phosphorescent QDs have been protected by bulky ligands, physical incorporation in polymer matrices, and covalent bonding with polymer matrices. The stability of electroluminescent QLEDs can be enhanced by using inorganic charge transport layers and by improving charge balance. As understanding of the degradation mechanisms of QDs increases and more stable QDs and display devices are developed, QDs are expected to play critical roles in advanced display applications.
量子点（QDs）因其优异的光学性能，包括可调节的带隙、窄发射带宽和高效率，而在显示应用中备受关注。然而，必须克服其稳定性问题才能实现进一步发展。量子点因其光致发光（PL）和电致发光特性而被用于显示应用。量子点的PL特性以颜色转换量子点薄膜的形式应用于显示或照明应用中，而量子点的电致发光则用于量子点发光二极管（QLED）。本文综述了量子点和量子点器件在显示应用中的稳定性研究。量子点会因氧气、水、热加热和紫外线照射而降解。已经开发出各种方法来通过控制其壳层和配体的组成来保护量子点不被降解。磷光量子点已通过庞大的配体、物理掺入聚合物基质以及与聚合物基质共价键合来进行保护。通过使用无机电荷传输层和改善电荷平衡，可以提高电致发光QLED的稳定性。随着对量子点降解机制的理解不断加深，以及开发出更稳定的量子点和显示器件，预计量子点将在先进显示应用中发挥关键作用。
