Precise Exciton Management of Quaternary Emission Layers for Highly Stable Organic Light-Emitting Diodes Based on Thermally Activated Delayed Fluorescence
Precise Exciton Management of Quaternary Emission Layers for Highly Stable Organic Light-Emitting Diodes Based on Thermally Activated Delayed Fluorescence
复制标题
基于热激活延迟荧光的高稳定有机发光二极管四元发射层的精确激子管理
DOI：
10.1021/acsami.0c15208
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发表时间：
2020
影响因子：
9.5
通讯作者：
Adachi Chihaya
中科院分区：
文献类型：
--
作者：
Tanaka Masaki;Nagata Ryo;Nakanotani Hajime;Adachi Chihaya
有机电致发光二极管（OLED）需要同时实现高电致发光效率和高操作稳定性以用于各种实际应用。尽管基于热激活延迟荧光辅助荧光（TAF）的OLED被认为具有有前途的器件架构以充分利用OLED的潜力，但此类系统的操作稳定性仍需要进一步改进。在这项研究中，四元发射层组成的TAF和混合主机系统的组合。包含该发光层的OLED通过管理激子产生过程而显示出改善的操作稳定性，同时保持高的电致发光效率。此外，共主体基质的混合比例的梯度被用来优化发射层中的复合区轮廓，导致与相应的基于单主体的器件相比，工作寿命提高了17倍。本研究为开发高稳定性的TAF-OLED提供了一种简单而通用的方法。
Simultaneous achievement of both high electroluminescence efficiency and high operational stability in organic light-emitting diodes (OLEDs) is required for their use in various practical applications. Although OLEDs based on thermally activated delayed fluorescence-assisted fluorescence (TAF) are considered to possess a promising device architecture to exploit the full potential of OLEDs, the operational stability of such systems still requires further improvement. In this study, a quaternary emission layer consisting of a combination of TAF and mixed-host systems is developed. OLEDs containing this emission layer show improved operational stability through the management of exciton generation processes while maintaining high electroluminescence efficiency. Furthermore, a gradient of the mixed ratio of the co-host matrix is used to optimize the recombination zone profile in the emission layer, leading to 17 times improvement of the operational lifetime compared with that of the corresponding single-host-based device. This research provides a simple and general method to develop highly stable TAF-OLEDs.