Pure white emission full thermally activated delayed fluorescence organic light emitting diode with a supplementary emission layer

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Optical Materials Pub Date : 2024-09-22 DOI:10.1016/j.optmat.2024.116154

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Abstract

In addition to efficiency and lifetime, spectral stability, high color rendering index (CRI), and the Commission Internationale de l’Eclairag (CIE) coordinate close to the equi-energy white point (0.33, 0.33) are also important parameters for the development of white organic light emitting diodes (WOLEDs). However, how to realize these advantages at the same time is a challenge. In this paper, a series of white devices based on complementary color full thermally activated delayed fluorescence (full-TADF) emitters were fabricated with the aim to obtain WOLEDs with high color rendering index and CIE coordinate near the equi-energy white point. Through optimizing the doping concentration of the emitters, adding a supplementary emission layer, modifying the thickness of the main emission layer and the supplementary emission layer, the best device displays the CIE coordinates of (0.34, 0.35) and the CRI of 86, exhibiting good white emission. The results in this paper may provide a feasible method for realizing complementary color full-TADF WOLEDs with pure white emission.

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带辅助发射层的纯白发射全热激活延迟荧光有机发光二极管

除了效率和寿命外，光谱稳定性、高显色指数（CRI）以及接近等能白点（0.33，0.33）的国际照明委员会（CIE）坐标也是开发白色有机发光二极管（WOLED）的重要参数。然而，如何同时实现这些优势是一个难题。本文制作了一系列基于互补色全热激活延迟荧光（full-TADF）发射器的白光器件，旨在获得显色指数高、CIE 坐标接近等能白点的 WOLED。通过优化发射极的掺杂浓度、添加辅助发射层、改变主发射层和辅助发射层的厚度，最佳器件的 CIE 坐标为（0.34，0.35），显色指数为 86，表现出良好的白光发射性能。本文的研究结果为实现纯白发射的互补色全 TADF WOLED 提供了一种可行的方法。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.