Highly Stable Red Quantum Dot Light-Emitting Diodes with Long T95 Operation Lifetimes,The Journal of Physical Chemistry Letters

当前位置： X-MOL 学术 › J. Phys. Chem. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Highly Stable Red Quantum Dot Light-Emitting Diodes with Long T95 Operation Lifetimes
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-04-04 , DOI: 10.1021/acs.jpclett.0c00836
Dongqiang Liu ₁ , Sheng Cao ₂ , Siyuan Wang ₁ , Hongqin Wang ₁ , Wei Dai ₁ , Bingsuo Zou ₂ , Jialong Zhao ₂ , Yunjun Wang ₁

Affiliation

Quantum dot light-emitting diodes (QLEDs) with an excellent external quantum efficiency (EQE) and an excellent lifetime almost meet the requirements for low-brightness displays. However, the short operation lifetime under high brightness limits the application of QLEDs in outdoor displays and lightings. Herein, we report a highly efficient, stable red QLED using co-doped lithium and magnesium as well as a magnesium oxide shell-coated zinc oxide nanoparticle layer as an electron transport layer (ETL). The optimized QLED has a high peak EQE of 20.6%, a low efficiency roll-off at high current, and a remarkably long lifetime T₉₅ of >11000 h at 1000 cd m^–2, which is an indication of the realization of the most stable red QLED to date. The improvement in the long term stability of the QLED is attributed to the use of a co-doped and shell-coated zinc oxide ETL with a reduced level of electron injection to improve the charge balance in the device.

中文翻译：

T ₉₅工作寿命长的高度稳定的红色量子点发光二极管

具有出色的外部量子效率（EQE）和出色的使用寿命的量子点发光二极管（QLED）几乎可以满足低亮度显示器的要求。但是，高亮度下的短使用寿命会限制QLED在户外显示器和照明设备中的应用。在本文中，我们报道了一种高效，稳定的红色QLED，它使用共掺杂的锂和镁以及氧化镁壳包覆的氧化锌纳米颗粒层作为电子传输层（ETL）。经过优化的QLED具有高达20.6％的峰值EQE，在高电流下的低效率滚降，以及在1000 cd m ^–2时的长寿命T ₉₅ > 11000 h，这表明迄今为止已实现了最稳定的红色QLED。QLED的长期稳定性的改善归因于使用共掺杂和外壳包覆的氧化锌ETL，且电子注入水平降低，从而改善了器件中的电荷平衡。

更新日期：2020-04-24

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11