Nat. Commun.: Efficient, narrow-band, and stable electroluminescence from organoboron-nitrogen-carbonyl emitter

Title：

Efficient, narrow-band, and stable electroluminescence from organoboron-nitrogen-carbonyl emitter

Authors：

Ying-Chun Cheng^1#, Xun Tang^2#, Kai Wang^1,3*, Xin Xiong¹, Xiao-Chun Fan¹, Shulin Luo¹, Rajat Walia¹, Yue Xie¹, Tao Zhang¹, Dandan Zhang¹, Jia Yu^1,4, Xian-Kai Chen¹*, Chihaya Adachi^2,5*, and Xiao-Hong Zhang^1,4*

Institutions：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu, 215123, P.R.China.

²Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.

³Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, Jiangsu, PR China

⁴Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou, 215123, Jiangsu, PR China

⁵International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka, 819-0395, Japan.

Abstract：

Organic light-emitting diodes (OLEDs) exploiting simple binary emissive layers (EMLs) blending only emitters and hosts have natural advantages in low-cost commercialization. However, previously reported OLEDs based on binary EMLs hardly simultaneously achieved desired comprehensive performances, e.g., high efficiency, low efficiency roll-off, narrow emission bands, and high operation stability. Here, we report a molecular-design strategy. Such a strategy leads to a fast reverse intersystem crossing rate in our designed emitterh-BNCO-1 of 1.79×10⁵s⁻¹. An OLED exploiting a binary EML withh-BNCO-1 achieves ultrapure emission, a maximum external quantum efficiency of over 40% and a mild roll-off of 14% at 1000cd·m⁻². Moreover,h-BNCO-1 also exhibits promising operational stability in an alternative OLED exploiting a compact binary EML (the lifetime reaching 95% of the initial luminance at 1000cdm⁻²is ~ 137h). Here, our work has thus provided a molecular-design strategy for OLEDs with promising comprehensive performance.

IF：

17.694

Link：

https://www.nature.com/articles/s41467-024-44981-1