Enhanced Luminance of Electrochemical Cells with a Rationally Designed Ionic Iridium Complex and an Ionic Additive

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• 作者：Kristin J. Suhr ; Lyndon D. Bastatas ; Yulong Shen ; Lauren A. Mitchell ; Bradley J. Holliday ; Jason D. Slinker
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：April 13, 2016
• 年：2016
• 卷：8
• 期：14
• 页码：8888-8892
• 全文大小：257K
• 年卷期：0
• ISSN：1944-8252

文摘

Light-emitting electrochemical cells (LEECs) offer the potential for high efficiency operation from an inexpensive device. However, long turn-on times and low luminance under steady-state operation are longstanding LEEC issues. Here, we present a single-layer LEEC with a custom-designed iridium(III) complex and a lithium salt additive for enhanced device performance. These devices display reduced response times, modest lifetimes, and peak luminances as high as 5500 cd/m², 80% higher than a comparable device from an unoptimized complex and 50% higher than the salt-free device. Improved device efficiency suggests that salt addition balances space charge effects at the interfaces. Extrapolation suggests favorable half-lives of 120 ± 10 h at 1000 cd/m² and 3800 ± 400 h at 100 cd/m². Overall, complex design and device engineering produce competitive LEECs from simple, single-layer architectures.