Dong Jianchao, Lu Feifei, Han Dongyuan, Wang Jie, Zang Ziang, Kong Lingmei, Zhang Yu, Ma Xue, Zhou Jianheng, Ji Huiyu, Yang Xuyong, Wang Ning
Key Laboratory of Physics and Technology for Advanced Batteries of Ministry of Education, College of Physics, Jilin University, Changchun, 130012, P. R. China.
Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, 149 Yanchang Road, Shanghai, 200072, P. R. China.
Angew Chem Int Ed Engl. 2022 Oct 4;61(40):e202210322. doi: 10.1002/anie.202210322. Epub 2022 Aug 25.
The lagging development of deep-blue perovskite light-emitting diodes (PeLEDs) heavily impedes their practical applications in full-color display due to the absence of spectrally stable emitters and the mismatch of carrier injection capacity. Herein, we report highly efficient deep-blue PeLEDs through a new chemical strategy that addresses the dilemma for simultaneously constant electroluminescence (EL) spectra and high-purify phase in reduced-dimensional perovskites. The success lies in the control of adsorption-energy differences between phenylbutylamine (PBA) and ethylamine (EA) interacting with perovskites, which facilitates narrow n-value distribution. This approach leads to an increased exciton binding energy and enhanced surface potential, hence improving radiative recombination. As a result, an external quantum efficiency of 4.62 % is achieved in PeLEDs with a stable EL peak at 457 nm, demonstrating the best reported result for deep-blue PeLEDs so far.
深蓝色钙钛矿发光二极管（PeLEDs）的发展滞后，由于缺乏光谱稳定的发光体以及载流子注入能力不匹配，严重阻碍了其在全彩显示中的实际应用。在此，我们通过一种新的化学策略报告了高效的深蓝色PeLEDs，该策略解决了在低维钙钛矿中同时实现恒定电致发光（EL）光谱和高纯度相的难题。成功之处在于控制与钙钛矿相互作用的苯基丁胺（PBA）和乙胺（EA）之间的吸附能差异，这有助于实现窄的n值分布。这种方法导致激子结合能增加和表面电势增强，从而改善辐射复合。结果，在EL峰值稳定在457 nm的PeLEDs中实现了4.62%的外量子效率，这是迄今为止报道的深蓝色PeLEDs的最佳结果。
