Two new thermally activated delayed fluorescent molecules incorporating spiro-acridine donors for sky-blue organic light emitting diode devices demonstrating an impressive 31% EQE

IF 4.1 3区工程技术 Q2 CHEMISTRY, APPLIED Dyes and Pigments Pub Date : 2024-10-02 DOI:10.1016/j.dyepig.2024.112478

Aziz Khan , Wang Qiang , Sarvendra Kumar , Tim Leydecker , Zhiming Wang

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Abstract

Organic light-emitting diodes (OLEDs) utilizing thermally activated delayed fluorescence (TADF) materials as the emitting layer are promising candidates for highly efficient light emission. However, they have traditionally faced challenges with achieving high luminance and high external quantum efficiencies (EQEs) in blue region. Here, we report on the design strategy of a donor-acceptor (D-A) type skeleton for highly efficient emitters, SpiroAC-MeTRZ and AdAC-MeTRZ, which incorporate SpiroAC and AdAC as donors and triazine as an acceptor, respectively. The introduction of methyl group on phenyl arms of the acceptor triazine is responsible for shallowing the lowest unoccupied molecular orbital (LUMO). SpiroAC-MeTRZ and AdAC-MeTRZ exhibit higher HOMO and LUMO values (and therefore a larger energy gap, Eg) compared to SpiroAC-TRZ and a-DMAC-TRZ. The photophysical properties of the materials were explored, revealing excellent TADF properties. Moreover, in the case of AdAC-MeTRZ, the emission spectrum exhibits dual fluorescence emission (DFE), which can be ascribed to quasi-axial conformation (QAC) and quasi-equatorial conformation (QEC). The OLED devices fabricated with these materials exhibited efficient performance, with maximum external quantum efficiency (EQE) of 31.4 % and 14.6 % at 484 nm and 472 nm for SpiroAC-MeTRZ and AdAC-MeTRZ, respectively.

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结合螺吖啶供体的两种新型热激活延迟荧光分子，用于天蓝色有机发光二极管器件，显示出令人印象深刻的 31% EQE

利用热激活延迟荧光（TADF）材料作为发光层的有机发光二极管（OLED）有望实现高效发光。然而，它们历来面临着在蓝色区域实现高亮度和高外部量子效率（EQE）的挑战。在此，我们报告了高效发光体--螺AC-MeTRZ 和 AdAC-MeTRZ 的供体-受体（D-A）型骨架的设计策略。在受体三嗪的苯基臂上引入甲基是使最低未占分子轨道（LUMO）变浅的原因。与螺AC-TRZ和a-DMAC-TRZ相比，螺AC-MeTRZ和AdAC-MeTRZ表现出更高的HOMO和LUMO值（因此能隙Eg更大）。我们对这些材料的光物理特性进行了研究，发现它们具有出色的 TADF 特性。此外，AdAC-MeTRZ 的发射光谱表现出双重荧光发射（DFE），这可归因于准轴向构象（QAC）和准赤道构象（QEC）。使用这些材料制造的有机发光二极管器件表现出高效的性能，在 484 纳米波长和 472 纳米波长处，SpiroAC-MeTRZ 和 AdAC-MeTRZ 的最大外部量子效率（EQE）分别为 31.4% 和 14.6%。

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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.