期刊
ACS NANO
卷 9, 期 7, 页码 7553-7562出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b02826
关键词
flexible OLEDs; flexible transparent conductors; light outcoupling; plastic substrates
类别
资金
- National Basic Research Program of China [2014CB932600]
- National Natural Science Foundation of China [91433116, 91323303, 11474214, 612111116]
- Jiangsu Science and Technology Department [BK20140053]
- Bureau of Science and Technology of Suzhou Municipality [ZXG201422]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
Enhancing light outcoupling in flexible organic light-emitting diodes (FOLEDs) is an important task for increasing their efficiencies for display and lighting applications. Here, a strategy for an angularly and spectrally independent boost in light outcoupling of FOLEDs is demonstrated by using plastic substrates with a low refractive index, consisting of a bioinspired optical coupling layer and a transparent conductive electrode composed of a silver network. The good transmittance to full-color emission (>94% over the whole visible wavelength range), ultralow sheet resistance to carrier injection (<5 Omega sq(-1)), and high tolerance to mechanical bending of the ameliorated plastic substrates synergistically optimize the device performance of FOLEDs. The maximum power efficiencies reach 47, 93, 56, and 52 lm W-1 for red, green, blue, and white emissions, which are competitive with similarly structured OLEDs fabricated on traditional indium-tin-oxide (ITO) glass. This paradigm for light outcoupling enhancement in ITO-free FOLEDs offers additional features and design freedoms for highly efficient flexible optoelectronics in large-scale and low-cost manufacturing without the need for a high-refractive-index plastic substrate.
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