Near-Infrared OLEDs Based on Functional Pyrazinyl Azolate Os(II) Phosphors and Deuteration

IF 7.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Optical Materials Pub Date : 2022-07-17 DOI:10.1002/adom.202201291

Xiaomei Peng, Chia-Hsiu Yeh, Sheng Fu Wang, Jie Yan, Shifeng Gan, Shi-Jian Su, Xiuwen Zhou, Ye-Xin Zhang, Yun Chi

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引用次数: 8

Abstract

Near-infrared (NIR) emitting Os(II) complexes [Os(L1)₂(PPhMe₂)₂] (tz1), [Os(L2)₂(PPhMe₂)₂] (tz2), and [Os(L3)₂(PPhMe₂)₂] (tz3), bearing dual (1H-1,2,4-triazol-5-yl)pyrazine chromophoric chelates, are successfully developed. These pyrazine chelates tzn (n = 1, 2, 3) differ by the location and number of 4-(trifluoromethyl)phenyl appendage(s) on pyrazine, and the associated Os(II) complexes exhibit bathochromic shifted emission, higher quantum yield, and increased radiative lifetime in comparison to parent complex [Os(fprtz)₂(PMe₂Ph)₂] (tz0). Moreover, partially deuterated pyrazine chelate L1-d is prepared using post-synthetic deuteration, from which the Os(II) complex tz1 shows a photoluminescence quantum yield (PLQY) of 12.2% in co-doped 4,4′-bis(N-carbazolyl)biphenyl (CBP) thin film at 3 wt%. Further, the partially deuterated tz1-d exhibits a notable increase in PLQY to 17.8% upon co-deposited into CBP thin film, confirming the influence of C-H(D) stretching vibrations on the non-radiative transition processes. Finally, tz1-d is demonstrated to be suitable in the fabrication of efficient NIR organic light-emitting diodes (OLEDs), from which max. external quantum efficiency of 3.77% and max. radiance of 24.1 W sr^-1 m^-2 are recorded for emission with peak maximum at 776 nm. These experiments confirm the suppression of C–H vibration caused quenching by deuteration, which should be broadly applicable to the OLED emitters, especially in the NIR region.

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基于功能化吡嗪酰偶氮酸Os(II)荧光粉的近红外oled及其氘化

成功地制备了近红外(NIR)发射Os(II)配合物[Os(L1)2(PPhMe2)2] (tz1)、[Os(L2)2(PPhMe2)2] (tz2)和[Os(L3)2(PPhMe2)2] (tz3)，具有双(1h -1,2,4-三唑-5-基)吡嗪显色螯合物。这些吡嗪螯合物tzn (n = 1,2,3)在吡嗪上的4-(三氟甲基)苯基附体(s)的位置和数量不同，与母体配合物[Os(fprtz)2(PMe2Ph)2] (tz0)相比，相关的Os(II)配合物表现出色移发射、更高的量子产率和更长的辐射寿命。此外，采用合成后氘化法制备了部分氘化的吡嗪螯合物L1-d，其中Os(II)配合物tz1在共掺杂4,4′-双(n -咔唑基)联苯(CBP)薄膜中在3 wt%的光致发光量子产率(PLQY)为12.2%。此外，部分氘化的tz1-d共沉积到CBP薄膜后，PLQY显著增加至17.8%，证实了C-H(D)拉伸振动对非辐射跃迁过程的影响。最后，证明了tz1-d适用于制造高效的近红外有机发光二极管(oled)。外部量子效率为3.77%，最大。辐射强度为24.1 W sr-1 m-2，峰值在776 nm处。这些实验证实了氘化引起的C-H振动的抑制作用，这应该广泛适用于OLED发射体，特别是近红外区域。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.