Utilizing Spiro-Type Backbone Donor to Develop Exciplex Emitter and Highly Efficient Phosphorescent OLEDs With Low Efficiency Roll-Off

IF 2.9 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Electron Devices Pub Date : 2024-10-07 DOI:10.1109/TED.2024.3469176

Ming Zhang;Xiao-Cui Ma;Heng-Yuan Zhang;Gang Yang;Hui Lin;Cai-Jun Zheng;Xiaoyang Du;Silu Tao

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引用次数: 0

Abstract

New electron-donating materials are crucial for developing efficient exciplex emitters and host matrices in simplified phosphorescent organic light-emitting diodes (PhOLEDs) with low driving voltage, high efficiency, and minimal efficiency roll-off. Herein, a spiro backbone with a highly sterically rigid structure and orthogonal configuration was attached to the commonly used 9H-carbazole (Cz) via para-linking, resulting in a new electron-donating material 9-(9,

$9'$

-spirobi[fluoren]-2-yl)- 9H-Cz (SBF-Cz). The influence of the donor strength on the photophysical, electrochemical, and electroluminescent performances was studied. SBF-Cz exhibits a high T1 level, a shallow highest occupied molecular orbital (HOMO) level, and excellent thermal properties. Utilizing these properties, a simplified blue organic light-emitting diode (OLED) using SBF-Cz:2,4,6-Tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine (PO-T2T) as the emitter achieves an EL emission peak at 476 nm and a maximum external quantum efficiency (EQEmax) of 11.2%. Furthermore, the spiro-type exciplex as a universal host was systematically investigated in blue, green, and red PhOLEDs. Notably, the EQEmax of blue, green, and red PhOLEDs using the spiro-type exciplex as host improved by 6.8%, 23.8%, and 11.1%, respectively, compared to the conventional host mCP. Additionally, the blue, green, and red PhOLEDs exhibit lower EQE roll-off of 8.7%, 8.1%, and 1.2% at a brightness of 1000 cd

$\cdot $

m-2 compared to the reference devices. This work underscores the significance of the spiro-type donor in developing new blue exciplexes and host matrices for OLEDs.

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利用螺型骨架供体开发具有低效率滚降特性的激发器和高效磷光 OLED

新的电子供体材料对于开发具有低驱动电压、高效率和最小效率滚降的简化磷光有机发光二极管（PhOLED）中的高效赋形发光体和主基质至关重要。在此，我们通过对位连接将具有高立体刚性结构和正交构型的螺骨架连接到常用的 9H-咔唑（Cz）上，从而得到了一种新的电子供体材料 9-(9, $9'$ -spirobi[fluoren]-2-yl)- 9H-Cz（SBF-Cz）。研究了供体强度对光物理、电化学和电致发光性能的影响。SBF-Cz 具有较高的 T1 水平、较浅的最高占位分子轨道 (HOMO) 水平和优异的热性能。利用这些特性，一种使用 SBF-Cz：2,4,6-三[3-（二苯基膦酰基）苯基]-1,3,5-三嗪（PO-T2T）作为发射体的简化蓝色有机发光二极管（OLED）在 476 纳米波长处达到了 EL 发射峰值，最大外部量子效率（EQEmax）为 11.2%。此外，还在蓝色、绿色和红色 PhOLED 中系统地研究了作为通用宿主的螺类赋形剂。值得注意的是，与传统宿主 mCP 相比，使用螺型赋形剂作为宿主的蓝色、绿色和红色 PhOLED 的 EQEmax 分别提高了 6.8%、23.8% 和 11.1%。此外，与参考器件相比，在亮度为 1000 cd $\cdot $ m-2 时，蓝色、绿色和红色 PhOLED 的 EQE 起伏较低，分别为 8.7%、8.1% 和 1.2%。这项工作强调了螺型供体在开发新的蓝色赋形剂和 OLED 主基质方面的重要性。

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

IEEE Transactions on Electron Devices 工程技术-工程：电子与电气

CiteScore

5.80

自引率

16.10%

发文量

937

审稿时长

3.8 months

期刊介绍： IEEE Transactions on Electron Devices publishes original and significant contributions relating to the theory, modeling, design, performance and reliability of electron and ion integrated circuit devices and interconnects, involving insulators, metals, organic materials, micro-plasmas, semiconductors, quantum-effect structures, vacuum devices, and emerging materials with applications in bioelectronics, biomedical electronics, computation, communications, displays, microelectromechanics, imaging, micro-actuators, nanoelectronics, optoelectronics, photovoltaics, power ICs and micro-sensors. Tutorial and review papers on these subjects are also published and occasional special issues appear to present a collection of papers which treat particular areas in more depth and breadth.