Yang Xiaolong, Xu Shipan, Zhang Yan, Zhu Chengyun, Cui Linsong, Zhou Guijiang, Chen Zhao, Sun Yuanhui
School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Material Chemistry, Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
School of Applied Physics and Materials, Wuyi University, Jiangmen, 529020, P. R. China.
Angew Chem Int Ed Engl. 2023 Oct 9;62(41):e202309739. doi: 10.1002/anie.202309739. Epub 2023 Sep 4.
Highly efficient near-infrared (NIR) emitters have significant applications in medical and optoelectronic fields, but the development stays a great challenge due to the energy gap law. Here, we report two NIR phosphorescent Ir(III) complexes which display emission peaks around 730 nm with a narrow full width at half maximum of only 43 nm. Therefore, pure NIR luminescence can be obtained without having a very long emission wavelength, thus alleviating the restriction of the energy gap law, and obtaining impressively high photoluminescence quantum yield up to 0.70. More importantly, the pure NIR organic light-emitting diode (OLED) fabricated by the solution-processed mothed shows outstanding device performance with the highest external quantum efficiency of 16.43 %, which sets a new record for solution-processed NIR-OLEDs based on different emitters. This work sheds light on the development of Ir(III) complexes with narrowband emissions as highly efficient pure NIR-emitters.
高效近红外（NIR）发光体在医学和光电子领域有重要应用，但由于能隙定律，其发展仍然面临巨大挑战。在此，我们报道了两种近红外磷光铱（III）配合物，它们在730 nm左右显示发射峰，半高宽仅为43 nm，非常窄。因此，无需极长的发射波长就能获得纯近红外发光，从而缓解了能隙定律的限制，并获得了高达0.70的令人印象深刻的高光致发光量子产率。更重要的是，通过溶液处理方法制备的纯近红外有机发光二极管（OLED）表现出出色的器件性能，最高外量子效率达到16.43 %，这为基于不同发光体的溶液处理近红外OLED创造了新记录。这项工作为开发具有窄带发射的铱（III）配合物作为高效纯近红外发光体提供了思路。
