Narrowband Emission in Pt(II) Complexes via Ligand Engineering for Blue Phosphorescent Organic Light-Emitting Diodes

IF 8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Optical Materials Pub Date : 2024-09-10 DOI:10.1002/adom.202401451

Jiyoung Choi, Kiun Cheong, Seungwon Han, Jun Yeob Lee

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Abstract

In this study, three stable tetradentate Pt(II) complexes are synthesized and characterized, namely, Pt-biPh, Pt-biPh5tBu, and Pt-biPh4tBu, tailored for blue phosphorescent organic light-emitting diodes to realize high-efficiency and narrowband emissions via ligand engineering. Biphenyl (Pt-biPh) or tert-butyl-modified biphenyl (Pt-biPh5tBu and Pt-biPh4tBu) is introduced into the carbene unit of the ligand to control the intermolecular interactions between the Pt(II) phosphors. Pt-biPh, Pt-biPh5tBu, and Pt-biPh4tBu exhibit high photoluminescence quantum yields of 74%, 84%, and 92% with exciton lifetimes of 2.2, 2.3, and 2.5 µs, respectively, demonstrating rapid and efficient light emission. Furthermore, Pt-biPh, Pt-biPh5tBu, and Pt-biPh4tBu show maximum external quantum efficiency (EQE) values of 18.1%, 19.0%, and 21.8%, respectively. Pt-biPh5tBu and Pt-biPh4tBu exhibit narrowband emission with a full width at half maximum of 21 nm owing to the small vibrational emission because of their sterically hindered and bulky ligand structures. Moreover, phosphor-sensitized thermally activated delayed fluorescence devices employing a Pt-biPh4tBu sensitizer achieve a high EQE of 28.6%. In particular, Pt-biPh4tBu performs better than the state-of-the-art phosphor as the sensitizer of the blue phosphor-sensitized thermally activated delayed fluorescence devices in terms of the EQE.

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通过配体工程实现铂（II）配合物的窄带发射，从而实现蓝色磷光有机发光二极管

本研究合成并表征了三种稳定的四价铂(II)配合物，即 Pt-biPh、Pt-biPh5tBu 和 Pt-biPh4tBu，通过配体工程为蓝色磷光有机发光二极管量身定制，以实现高效窄带发射。在配体的碳烯单元中引入联苯（Pt-biPh）或叔丁基改性联苯（Pt-biPh5tBu 和 Pt-biPh4tBu），以控制铂（II）荧光粉之间的分子间相互作用。Pt-biPh、Pt-biPh5tBu 和 Pt-biPh4tBu 的光致发光量子产率分别高达 74%、84% 和 92%，激子寿命分别为 2.2、2.3 和 2.5 µs，显示了快速高效的光发射。此外，Pt-biPh、Pt-biPh5tBu 和 Pt-biPh4tBu 的最大外部量子效率（EQE）值分别为 18.1%、19.0% 和 21.8%。Pt-biPh5tBu 和 Pt-biPh4tBu 具有窄带发射，半最大值全宽为 21 纳米，这是因为它们的配体结构具有立体受阻和笨重的特点，振动发射较小。此外，采用 Pt-biPh4tBu 敏化剂的荧光粉敏化热激活延迟荧光器件的 EQE 高达 28.6%。特别是，作为蓝色荧光粉敏化热激活延迟荧光器件的敏化剂，Pt-biPh4tBu 在 EQE 方面的表现优于最先进的荧光粉。

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来源期刊

Advanced Optical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS

CiteScore

13.70

自引率

6.70%

发文量

883

审稿时长

1.5 months

期刊介绍： Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.