Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 14, Pages 8888-8892Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b01816
Keywords
light-emitting electrochemical cells; ionic iridium complex; ionic transition metal complex; ionic additives; organic light-emitting diodes; luminance
Funding
- UT Dallas startup funds
- Welch Foundation [F-1631]
- National Science Foundation [CHE-0847763]
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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/m(2), 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/m(2) and 3800 +/- 400 h at 100 cd/m(2). Overall, complex design and device engineering produce competitive LEECs from simple, single-layer architectures.
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