D-A和D-A- d体系中基于金刚烷取代吖啶供体/二苯酮受体的绿色TADF发射器

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals Pub Date : 2025-01-14 DOI:10.1016/j.synthmet.2025.117831

Aziz Khan , Yu-Yang Ma , Sarvendra Kumar , Shijie Ge , Man-Keung Fung , Tim Leydecker , Zhiming Wang

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引用次数: 0

摘要

从给体-受体（D-A）到给体-受体-供体（D-A- d）的基本骨架战略转变，以实现高效的外量子效率（EQE）和高热稳定性，这是开发有机发光二极管（OLED）新材料的一个邀请。通过这种方法，开发了金刚烷取代吖啶供体基发光体AA-DPK和AA-DPK- aa，用于绿色热激活延迟荧光（TADF）发射。此外，二苯酮单元被用作受体。探索了其光物理性质，发现其具有局部或弱发射和强分子内电荷转移（ICT）发射的双重发射特性。此外，AA-DPK和AA-DPK- aa分子在溶液中具有双重荧光发射（DFE）性质，在OLED器件中具有精确的发光峰，可归因于准轴向构象（QAC）和准赤道构象（QEC）。采用AA-DPK和AA-DPK- aa分子作为发射体的OLED器件，以广泛使用的主体材料1,3-双（n -咔唑基）苯（mCP）为主体，分别表现出较高的EQEs，分别为8.5 %和17 %。AA-DPK-AA分子不仅在EQEs等参数上有两倍的提高，而且在热稳定性和光致发光量子产率（PLQY）上也有两倍的提高。这些增强有助于分子在oled中的稳定性，导致低效率滚转和高整体效率。

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Green TADF emitters based on adamantane-substituted acridine donor/diphenyl ketone acceptor in D-A and D-A-D systems

The strategic change in the basic skeleton from donor-acceptor (D-A) to donor-acceptor-donor (D-A-D) to achieve an efficient external quantum efficiency (EQE) as well as high thermal stability is an invitation to develop new materials for organic light emitting diodes (OLED). In this way, adamantane-substituted acridine donor-based emitters, AA-DPK and AA-DPK-AA were developed for green thermally activated delayed fluorescence (TADF) emission. Moreover, the diphenylketone unit was used as an acceptor. The photophysical properties were explored and exhibited the dual emission characters, involving one emission from local or weak and other from strong intramolecular charge transfer (ICT) mechanism. Besides, the PL results exhibited the exact emission peaks not only in solution but also in OLED devices for AA-DPK and AA-DPK-AA molecules with dual fluorescence emission (DFE) nature in solution, which could be ascribed to quasi axial conformation (QAC) and quasi equatorial conformation (QEC). OLED devices using AA-DPK and AA-DPK-AA molecules as emitters with a widely used host material, 1,3-Bis(N-carbazolyl)benzene (mCP) exhibited green electroluminescence with higher EQEs of 8.5 % and 17 %, respectively. The AA-DPK-AA molecule demonstrated a two-fold improvement not only in EQEs and other parameters but also in thermal stability and photoluminescence quantum yield (PLQY). These enhancements contribute to the molecule's stability in OLEDs, resulting in low efficiency roll-off and high overall efficiency.

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来源期刊

Synthetic Metals 工程技术-材料科学：综合

CiteScore

8.30

自引率

4.50%

发文量

189

审稿时长

33 days

期刊介绍： This journal is an international medium for the rapid publication of original research papers, short communications and subject reviews dealing with research on and applications of electronic polymers and electronic molecular materials including novel carbon architectures. These functional materials have the properties of metals, semiconductors or magnets and are distinguishable from elemental and alloy/binary metals, semiconductors and magnets.