Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 10, Issue 6, Pages 2073-2079Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc05417a
Keywords
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Funding
- Center of Innovation (COI) Program of the Japan Science and Technology Agency, JST
- JSPS KAKENHI [20H02807]
- JST SICORP, Japan [JPMJSC2007]
- Grants-in-Aid for Scientific Research [20H02807] Funding Source: KAKEN
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In this study, highly stable and efficient deep-red OLEDs were achieved by using a novel exciplex host system. The optimized device exhibited a lifetime that was 6.6 times longer than state-of-the-art deep-red OLEDs and maintained a high maximum external quantum efficiency at a low operating voltage.
Although deep-red illumination light sources with an emission peak wavelength over 660 nm are optimal for plant growth and health monitoring systems, the stability and efficiency of organic light-emitting diodes (OLEDs) are insufficient for practical applications. In this study, we developed a novel exciplex host system to realize highly stable and efficient deep-red OLEDs by utilizing nBPhen, a phenanthroline derivative, as the n-type exciplex host partner and a combination of (DPQ)(2)Ir(dpm), a deep-red iridium complex, and alpha-NPD, a conventional triarylamine derivative, as the p-type exciplex host partner. The proposed optimized device exhibits a lifetime that is 6.6 times longer when compared with the state-of-the-art deep-red OLEDs and maintains a high maximum external quantum efficiency of approximately 17% at a low operating voltage of 2.37 V; such a performance is considered to be among the best in the scientific literature.
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