Thermally activated delayed fluorescence dyes featuring an intramolecular-locked azaryl ketone acceptor for electroluminescence application

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2024-07-27 DOI:10.1016/j.jphotochem.2024.115922

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Abstract

We have developed two novel thermally activated delayed fluorescence (TADF) emitters, IQLO-PXZ and IQLO-DMAC, featuring an intramolecularly locked indeno[1,2-b]quinolin-11-one (IQLO) acceptor. Our comprehensive investigation, including structural analysis, theoretical calculations, and photophysical studies, aims to assess the viability of IQLO-PXZ and IQLO-DMAC as light emitters in electroluminescent devices. Unlike existing aryl ketone-based emitters, IQLO-PXZ and IQLO-DMAC exhibit red-shifted emission due to their structurally rigid and electron-deficient IQLO moiety. The stronger intramolecular charge transfer effect in IQLO-PXZ results in longer-wavelength emission compared to IQLO-DMAC. Both emitters demonstrate significant TADF properties, facilitating efficient triplet-to-singlet spin conversion. When utilized as the emissive core in electroluminescent devices, IQLO-PXZ and IQLO-DMAC achieved long-wavelength electroluminescence peaking at 612 nm and 578 nm, with commendable external quantum efficiencies of 10.3 % and 11.7 %, respectively. These findings underscore the potential of IQLO as an effective acceptor for constructing high-performance TADF electroluminescent materials.

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具有分子内锁定偶氮芳基酮受体的热激活延迟荧光染料的电致发光应用

我们开发出了两种新型热激活延迟荧光（TADF）发光体--IQLO-PXZ 和 IQLO-DMAC，它们都具有分子内锁定的茚并[1,2-b]喹啉-11-酮（IQLO）受体。我们的综合研究包括结构分析、理论计算和光物理研究，旨在评估 IQLO-PXZ 和 IQLO-DMAC 作为电致发光器件中发光体的可行性。与现有的芳基酮基发光体不同，IQLO-PXZ 和 IQLO-DMAC 因其结构刚性和缺电子的 IQLO 分子而表现出红移发射。与 IQLO-DMAC 相比，IQLO-PXZ 分子内电荷转移效应更强，因此发射波长更长。这两种发射器都显示出显著的 TADF 特性，促进了三重自旋到小自旋的高效转换。将 IQLO-PXZ 和 IQLO-DMAC 用作电致发光器件的发射芯时，它们的长波长电致发光峰值分别为 612 纳米和 578 纳米，外部量子效率分别为 10.3% 和 11.7%。这些发现凸显了 IQLO 作为一种有效受体在构建高性能 TADF 电致发光材料方面的潜力。

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来源期刊

Journal of Photochemistry and Photobiology A-chemistry 化学-物理化学

CiteScore

7.90

自引率

7.00%

发文量

580

审稿时长

48 days

期刊介绍： JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds. All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor). The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.