Enhancing the Overall Performances of Blue Light-Emitting Electrochemical Cells by Using an
Lei He1, Xiaoxiang Wang1, Lian Duan2
1College of Chemistry, Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis , Central China Normal University , Wuhan , Hubei 430079 , P. R. China.
Abstract:
Light-emitting electrochemical cells (LECs) have emerged as a promising emissive thin-film technology for next-generation solid-state lighting. However, blue LECs show low performances, which has remained a bottleneck for the fabrication of white LECs for lighting applications. Here, we demonstrate a remarkable enhancement of overall device performance for blue LECs by using an electron-injecting/transporting ionic additive, that is, [Zn(bpy)3](PF6)2 (bpy is 2.2'-bipyridine, PF6- is hexafluorophosphate). It is revealed that adding [Zn(bpy)3](PF6)2 into the active layers of blue LECs accelerates the device response, simultaneously enhances the brightness and efficiency, reduces the efficiency roll-offs, significantly improves the blue color stability upon the continuous electrical operation, and enhances the device operational stability at optimized conditions. The remarkable enhancement of the overall device performance upon adding [Zn(bpy)3](PF6)2 results from facilitated electron injection/transport and thus more balanced electron-hole recombination and more centered recombination zone, as well as the reduction of phosphorescence concentration quenching in the LECs. The work demonstrates for the first time that the use of electron-injecting/transporting ionic additives such as [Zn(bpy)3](PF6)2 is a facile yet effective strategy to remarkably boost the overall performances of blue LECs.
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