Azepine Modulation in Thermally Activated Delayed Fluorescence Emitters for OLEDs Achieving Nearly 40% EQE

IF 9.6 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Materials Letters Pub Date : 2025-04-16 DOI:10.1021/acsmaterialslett.5c0053610.1021/acsmaterialslett.5c00536

Jian Lei, Yi-Kuan Chen, Min-Jie Wang, Chang-Lun Ko, Wen-Yi Hung, Liang-Yan Hsu*, Tien-Lin Wu* and Chien-Hong Cheng*,

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Abstract

Thermally activated delayed fluorescence (TADF) emitters play a crucial role in advancing the use of OLED technologies to meet the increasing demands of full-color displays and solid-state lighting. In this work, we present two azepine-pyridine-carbonitrile-based compounds named ISBmPPC and IDBmPPC. Compared to ISBmPPC with a donor iminostilbene (ISB), IDBmPPC with a donor iminodibenzyl (IDB) displays an excellent photoluminescence quantum yield of 95.8%. IDBmPPC with a single bond in a seven-membered nitrogen-containing heterocycle obtains a ΔE_ST of 0.03 eV, a reverse intersystem crossing rate of 2.85 × 10⁶ s^–1, and a horizontal dipole orientation (Θ_//) of 85% in the solid state. Consequently, the IDBmPPC-based OLED device achieved a maximum external quantum efficiency of 39.6%, a maximum current efficiency of 130.1 cd A^–1, and a maximum power efficiency of 136.2 lm W^–1 with a CIE color coordinate of (0.31, 0.57). This IDB-based molecular design is expected to be applicable to other systems for improving OLED performance.

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热激活延迟发光二极管的氮平调制实现近40% EQE

热激活延迟荧光（TADF）发射器在推进OLED技术的使用以满足日益增长的全彩显示和固态照明需求方面发挥着至关重要的作用。在这项工作中，我们提出了两个氮平-吡啶-碳腈基化合物，分别命名为ISBmPPC和IDBmPPC。与以亚氨基二苯（ISB）为供体的ISBmPPC相比，以亚氨基二苯（IDB）为供体的IDBmPPC表现出优异的光致发光量子产率，达到95.8%。在七元含氮杂环中单键的IDBmPPC在固态中得到了ΔEST为0.03 eV，反向系统间交叉速率为2.85 × 106 s-1，水平偶极子取向（Θ//）为85%。因此，基于idbmppc的OLED器件的最大外部量子效率为39.6%，最大电流效率为130.1 cd a - 1，最大功率效率为136.2 lm W-1， CIE颜色坐标为（0.31,0.57）。这种基于idb的分子设计有望应用于其他系统，以提高OLED的性能。

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来源期刊

ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

期刊介绍： ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.