高性能OLED主体材料：咔唑-苯并咔唑衍生物的光物理性质及器件优化

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-06-16 DOI:10.1016/j.dyepig.2025.112965

Daiva Tavgeniene , Dovydas Blazevicius , Eigirdas Skuodis , Saulius Grigalevicius , Chi-Hao Huang , Yu-Hsuan Chen , Chih-Hao Chang

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引用次数: 0

摘要

近年来，有机发光二极管（oled）一直处于个人电子和照明应用的前沿。为了进一步提高器件效率，开发用于磷光和TADF发射器的新型宿主材料至关重要。在这种需求的推动下，我们设计并合成了咔唑-苯并[a]咔唑基化合物，它们以可控的烷基取代作为空孔运输宿主，加入乙基（eCzBCz）或丁基（bCzBCz）链，以改善黄色TADF和红色磷光oled的成膜性能。这些新材料表现出高热稳定性（Td≈350℃）和形成非晶层的能力，其中eCzBCz的Tg水平特别高，达到107℃。光物理分析显示其荧光和磷光光谱明显，单线态（三重态）能隙分别为3.47 eV （2.53 eV）和3.47 eV （2.50 eV）。由于CN-T2T的空穴输运能力强，电子输运能力弱，因此引入了含有CN-T2T的共宿主体系来增强负电荷输运。使用这些材料的OLED器件表现出更好的电荷平衡、更高的效率和更低的效率滚降。混合主机的器件表现出超过20%的优异的外量子效率（EQE）和稳定的色发射。此外，寿命测试证实了基于eczbz的器件在高电场下具有更高的稳定性，突出了其在高性能OLED应用中的潜力。

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High-performance OLED host materials: Photophysical properties and device optimization of carbazole-benzocarbazole derivatives

Organic light-emitting diodes (OLEDs) have been at the forefront of advancements in personal electronics and lighting applications in recent years. To further enhance device efficiency, the development of new host materials for phosphorescent and TADF emitters is essential. Motivated by this need, we designed and synthesized carbazole-benzo [a]carbazole-based compounds with controlled alkyl substitution as hole-transporting hosts, incorporating ethyl (eCzBCz) or butyl (bCzBCz) chains to improve film-forming properties for yellow TADF and red phosphorescent OLEDs. These new materials exhibited high thermal stability (T_d ≈ 350 °C) and the ability to form amorphous layers, with eCzBCz demonstrating a particularly high T_g level of 107 °C. Photophysical analyses reveal distinct fluorescence and phosphorescence spectra, with respective singlet (triplet) energy gaps of 3.47 eV (2.53 eV) and 3.47 eV (2.50 eV). Due to their strong hole transport but weak electron transport capabilities, a co-host system incorporating CN-T2T was introduced to enhance negative charge transport. OLED devices using these materials demonstrated improved charge balance, higher efficiency, and reduced efficiency roll-off. Devices with blended hosts exhibited superior external quantum efficiency (EQE) exceeding 20 % and stable color emissions. Additionally, the lifetime tests confirmed the higher stability of eCzBCz-based devices under high electric fields, highlighting their potential for high-performance OLED applications.

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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.