构象异构化促进窄带近紫外荧光团和无掺杂器件的平衡双极性传输，实现低效率滚降

IF 8.7 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Materials Letters Pub Date : 2024-07-23 DOI:10.1021/acsmaterialslett.4c00882

Haoyuan Qi, Shengnan Wang, Zexuan Gao, Danyu Xie, Jie Li, Yuchao Liu, Shanfeng Xue, Shian Ying, Dongge Ma, Shouke Yan

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引用次数: 0

摘要

近紫外（NUV）有机发光二极管备受关注，然而发射器中不平衡的极性输运往往会导致电致发光效率低下，并在非掺杂器件中产生严重的滚降。在此，我们通过调节取代模式，开发出了一种新型 NUV 荧光体，即 3,6-CNCzC3，它呈现出一种杂化的局部和电荷转移状态。构象异构化使其在低电场和高电场中都具有平衡的电子/空穴迁移率，同时抑制了激发态的结构弛豫和低频振子耦合，促进了光谱变窄。因此，基于非掺杂 3,6-CNCzC3 的器件不仅显示出 44 nm 的窄半极大值全宽和 (0.161, 0.028) 的色坐标，还显示出 6.69% 的最大外部量子效率，并在 1000 cd m-2 时保持 5.95% 的显著值，这是非掺杂 NUV-OLED 在高亮度水平下的最佳值之一。

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Conformational Isomerization Promotes Balanced Ambipolar Transport for Efficient Narrowband Near-Ultraviolet Fluorophore and Non-doped Device with Low Efficiency Roll-Off

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Conformational Isomerization Promotes Balanced Ambipolar Transport for Efficient Narrowband Near-Ultraviolet Fluorophore and Non-doped Device with Low Efficiency Roll-Off

Near-ultraviolet (NUV) organic light-emitting diodes have garnered significant attention, yet the unbalanced ambipolar transport in emitters often leads to poor electroluminescence efficiency and serious roll-off in the non-doped device. Here, a novel NUV fluorophore, namely, 3,6-CNCzC3, exhibiting a hybridized local and charge transfer state, was developed by regulating the substitution pattern. The conformational isomerization endows it with balanced electron/hole mobilities in both low and high electric fields, while the suppression of structural relaxation and low-frequency vibronic coupling in the excited state promotes spectral narrowing. Consequently, the non-doped 3,6-CNCzC3-based device not only shows a narrow full width at half-maximum of 44 nm and color coordinates of (0.161, 0.028), but also exhibits a maximum external quantum efficiency of 6.69% and maintains a noteworthy value of 5.95% at 1000 cd m^–2, which is one of the best values among non-doped NUV-OLEDs at a high luminance level.

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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.