Enhancing the emissive film quality: A new role of TADF materials for high-performance blue perovskite light-emitting diodes

IF 2.7 4区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Organic Electronics Pub Date : 2024-11-04 DOI:10.1016/j.orgel.2024.107158

Dengduan Zheng , Yubu Zhou , Yi Dai , Lingjiao Zhang , Qiuyu Long , Baiquan Liu

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Abstract

Thermally activated delayed fluorescence (TADF) materials are widely used in the field of organic light-emitting diodes (OLEDs) because they can capture both singlet and triplet excitons for light emission. However, only scare attention has been paid to the application of TADF materials in perovskite LEDs (PeLEDs) and the understanding of effects of TADF materials in PeLEDs is limited. In this study, a new role of TADF materials for achieving high-quality perovskite films to enhance the performance of PeLEDs is emphasized. TADF materials are introduced into quasi-2D blue PeLEDs to assist in the crystallization of perovskites during film annealing and ensure the formation of high-quality films with reduced defects, enhancing device performance. Additionally, a step-like hole transport layer has been constructed to reduce the hole transport barrier, which can further enhance the performance of PeLEDs. The resultant blue PeLEDs exhibits an external quantum efficiency of 5.44 %, which is 12.7-fold higher than that of the control device. Furthermore, a turn-on voltage of 2.6 V is achieved, which is the lowest for TADF-based blue PeLEDs. The findings may not only unlock a new role of TADF materials in blue PeLEDs, but also provide an alternative pathway to achieve high-performance PeLEDs.

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提高发光薄膜质量：TADF 材料在高性能蓝色过氧化物发光二极管中的新作用

热激活延迟荧光（TADF）材料可以捕获单态和三态激子进行发光，因此被广泛应用于有机发光二极管（OLED）领域。然而，人们对 TADF 材料在过氧化物发光二极管（PeLED）中的应用关注甚少，对 TADF 材料在 PeLED 中的作用的了解也很有限。本研究强调了 TADF 材料在实现高质量包晶薄膜以提高 PeLED 性能方面的新作用。在准二维蓝色 PeLED 中引入 TADF 材料，可在薄膜退火过程中帮助包晶体结晶，并确保形成减少缺陷的高质量薄膜，从而提高器件性能。此外，还构建了阶梯状空穴传输层，以降低空穴传输障碍，从而进一步提高珀尔LED的性能。由此产生的蓝色 PeLED 的外部量子效率为 5.44%，是对照器件的 12.7 倍。此外，还实现了 2.6 V 的开启电压，这是基于 TADF 的蓝色 PeLED 的最低电压。这些发现不仅为 TADF 材料在蓝色 PeLED 中发挥新作用揭开了序幕，而且为实现高性能 PeLED 提供了另一条途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Organic Electronics 工程技术-材料科学：综合

CiteScore

6.60

自引率

6.20%

发文量

238

审稿时长

44 days

期刊介绍： Organic Electronics is a journal whose primary interdisciplinary focus is on materials and phenomena related to organic devices such as light emitting diodes, thin film transistors, photovoltaic cells, sensors, memories, etc. Papers suitable for publication in this journal cover such topics as photoconductive and electronic properties of organic materials, thin film structures and characterization in the context of organic devices, charge and exciton transport, organic electronic and optoelectronic devices.