Challenges and solutions for high-efficiency quantum dot-based LEDs
Challenges and solutions for high-efficiency quantum dot-based LEDs
复制标题
DOI：
10.1557/mrs.2013.180
复制
发表时间：
2013-09-01
期刊：
影响因子：
5
通讯作者：
Wood, Vanessa
中科院分区：
文献类型：
--
作者：
Bozyigit, Deniz;Wood, Vanessa
胶体量子点（QD）作为固态照明和显示应用的发光二极管（LED）中的电激发发射体具有很大的前景，最近通过展示具有与商业化有机LED技术相当的效率的红光发射QD-LED来强调。在过去的五年中，在量子点材料的合成、量子点物理的理解以及量子点集成到固态器件中方面取得了重要进展。从这一进展中获得的见解可以用来制定一套指导QD-LED创新的指导方针。本文回顾了迄今为止所了解的QD-LED效率低下的根本原因，并提出了潜在的解决方案。特别是，我们强调的挑战，在开发量子点发射器，表现出高的发光量子产率的电荷载流子和电场的组合存在下，出现在传统的LED操作。为了应对这一挑战，我们提出了可能的量子点化学和有源层设计，以及新的设备架构和模式的QD-LED操作。这些建议可以作为推动高性能QD-LED开发和商业化所需的创新类型的例子。
Colloidal quantum dots (QDs) hold great promise as electrically excited emitters in light-emitting diodes (LEDs) for solid-state lighting and display applications, as highlighted recently by the demonstration of a red-emitting QD-LED with efficiency on par with that of commercialized organic LED technologies. In the past five years, important advances have been made in the synthesis of QD materials, the understanding of QD physics, and the integration of QDs into solid-state devices. Insights from this progress can be leveraged to develop a set of guidelines to direct QD-LED innovation. This article reviews the fundamental causes of inefficiency in QD-LEDs understood to date and proposes potential solutions. In particular, we emphasize the challenge in developing QD emitters that exhibit high luminescent quantum yields in the combined presence of charge carriers and electric fields that appear during traditional LED operation. To address this challenge, we suggest possible QD chemistries and active layer designs as well as novel device architectures and modes of QD-LED operation. These recommendations serve as examples of the type of innovations needed to drive development and commercialization of high-performance QD-LEDs.