期刊
ADVANCED FUNCTIONAL MATERIALS
卷 25, 期 18, 页码 2660-2668出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201500310
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资金
- National Basic Research Program of China [2014CB932600]
- National Natural Science Foundation of China [91433116, 11474214]
- 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
White organic light-emitting diodes (OLEDs) hold great promise for applications in displays and lighting due to high efficiency and superior white color balance. However, further improvement in efficiency remains a continuous and urgent demand due to limited energy flow extraction. A powerful method for drastically releasing the trapped energy flow in conventional white OLEDs is demonstrated by implementing unique quasi-periodic subwavelength nanofunnel arrays (NFAs) via soft nanoimprinting lithography, which is ideal for enhancing light extraction without any spectral distortion or angular dependence. The resulting efficiency is over 2 times that of a conventional OLED used as a comparison. The external quantum efficiency and power efficiency are raised to 32.4% and 56.9 lm W-1, respectively. Besides, the substantial increase in efficiency over a broad bandwidth with angular color stability, the experimental proofs show that the NFA-based extraction structure affords the enticing capacity against scrubbing and the self-cleaning feature, which are critical to the commercial viability in practical applications.
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