High efficiency and color purity organic near-ultraviolet (NUV) electroluminescence based on hybridized local and charge transfer (HLCT) molecules with fluorobenzene π-bridge

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-08-28 DOI:10.1016/j.dyepig.2025.113192

Li Zhang , Jingru Song , Chenglin Ma , Yannan Zhou , Shenghui Zhou , Qikun Sun , Wenjun Yang , Shanfeng Xue

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引用次数: 0

Abstract

The performance of near-ultraviolet organic light-emitting devices (NUV OLEDs)—particularly regarding efficiency and color purity—significantly lags behind that of red, green, and blue (RGB) OLEDs. In this work, two novel fluorinated D-π-A emitters CZ-2FPPCN and TPA-2FPPCN with the hybridized local and charge-transfer (HLCT) characteristic are reported. Theoretical and photophysical analyses confirm the characteristic HLCT behavior in both molecules. Single-crystal structural data demonstrate that fluorination enriches intermolecular interactions, effectively restricting intramolecular vibrations and enhancing photoluminescence quantum yields. As a result, non-doped devices based on these emitters achieve maximum external quantum efficiencies (EQE_max) of 6.42 % and 4.52 %, respectively. Upon doping into a CBP host matrix, both materials exhibit balanced carrier mobilities exceeding 10⁻⁶ cm² V⁻¹ s⁻¹, with EQE further improved to 7.00 % and 5.47 % for CZ-2FPPCN and TPA-2FPPCN, respectively. Importantly, the CZ-2FPPCN-based device achieves Commission International de L'Eclairage (CIE) coordinates of (0.158, 0.039) with a narrow full-width at half-maximum (FWHM) of 48 nm, concurrently realizing high efficiency and exceptional color purity. This study demonstrates that fluorination represents a viable strategy to overcome inherent molecular design trade-offs in NUV emitters, providing a straightforward pathway for the further development of high-performance NUV electroluminescent materials.

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基于含氟苯π桥的杂化局部电荷转移（HLCT）分子的高效、高色度有机近紫外（NUV）电致发光

近紫外有机发光器件（NUV oled）的性能——特别是在效率和颜色纯度方面——明显落后于红、绿、蓝（RGB） oled。本文报道了两种具有局部杂化和电荷转移（HLCT）特性的新型氟化D-π-A发射体CZ-2FPPCN和TPA-2FPPCN。理论和光物理分析证实了这两种分子的HLCT特性。单晶结构数据表明，氟化丰富了分子间的相互作用，有效地限制了分子内的振动，提高了光致发光量子产率。因此，基于这些发射体的非掺杂器件的最大外部量子效率（EQEmax）分别为6.42%和4.52%。在CBP基质中掺杂后，两种材料的载流子迁移率均超过10−6 cm2 V−1 s−1，且CZ-2FPPCN和TPA-2FPPCN的EQE分别提高到7.00%和5.47%。重要的是，基于cz - 2fppcn的器件实现了国际委员会（CIE）坐标（0.158,0.039），半最大值窄全宽（FWHM）为48 nm，同时实现了高效率和卓越的颜色纯度。这项研究表明，氟化是一种可行的策略，可以克服超低紫外线发射器固有的分子设计权衡，为进一步开发高性能超低紫外线电致发光材料提供了一条直接的途径。

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

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.