Orbital Symmetry Engineering in Fused Polycyclic Heteroaromatics toward Extremely Narrowband Green Emissions with an FWHM of 13 nm,Advanced Materials

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Orbital Symmetry Engineering in Fused Polycyclic Heteroaromatics toward Extremely Narrowband Green Emissions with an FWHM of 13 nm
Advanced Materials ( IF 27.4 ) Pub Date : 2023-03-01 , DOI: 10.1002/adma.202211316
Xuan Zeng _{1,

2} , Lu Wang ₁ , Hengyi Dai ₁ , Tianyu Huang ₁ , Mingxu Du ₁ , Dong Wang ₂ , Dongdong Zhang ₁ , Lian Duan _{1,

2}

Affiliation

Multiresonance (MR) molecules generally face spectral broadening issues with redshifted emissions. Thus, green emitters with full widths at half maximum (FWHMs) of <20 nm are rarely reported, despite being highly desired. Herein, by properly fusing indolo(3,2,1-jk)carbazole (ICZ) and naphthalene moieties, green MR emitters are reported, which have FWHMs of merely 13 nm (0.064 eV) and 14 nm (0.069 eV) in dichloromethane, accompanied by high photoluminescence quantum yields of >95%, which represent not only the smallest FWHMs among all green MR emitters but also the first green emitters based on ICZ MR derivatives. Theoretical studies reveal that the orbital interactions between the antisymmetric sites of the segments play an important role in extending the conjugation length in the fusion architectures while simultaneously maintaining a small FWHM. The corresponding organic light-emitting diodes exhibit green emission peaks at 508–509 nm and the first green electroluminescence FWHM of <20 nm ever reported. Benefiting from the preferential horizontal dipole orientation, a high maximum external quantum efficiency of up to 30.9% is obtained, which remains at 28.9% and 23.2% under luminances of 1000 and 10 000 cd m⁻², respectively, outperforming most reported green devices based on narrowband emitters.

中文翻译：

FWHM 为 13 nm 的稠合多环杂芳烃的轨道对称工程朝向极窄带绿色发射

多共振 (MR) 分子通常面临红移发射的光谱展宽问题。因此，尽管非常需要，但很少报道半峰全宽 (FWHM) 小于 20 nm 的绿色发射体。在此，通过适当融合吲哚（3,2,1- jk)咔唑 (ICZ) 和萘部分，绿色 MR 发射体被报道，其在二氯甲烷中的 FWHM 仅为 13 nm (0.064 eV) 和 14 nm (0.069 eV)，伴随着 >95% 的高光致发光量子产率，这代表不在所有绿色 MR 发射器中只有最小的 FWHM，也是第一个基于 ICZ MR 衍生物的绿色发射器。理论研究表明，片段的反对称位点之间的轨道相互作用在延长融合结构中的共轭长度同时保持较小的 FWHM 方面起着重要作用。相应的有机发光二极管在 508-509 nm 处表现出绿色发射峰，并且首次报道了 <20 nm 的绿色电致发光 FWHM。受益于优先水平偶极子方向，^-2，分别优于大多数报告的基于窄带发射器的绿色设备。

更新日期：2023-03-01

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