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- Title
Efficiently Releasing the Trapped Energy Flow in White Organic Light-Emitting Diodes with Multifunctional Nanofunnel Arrays.
- Authors
Zhou, Lei; Ou, Qing‐Dong; Li, Yan‐Qing; Xiang, Heng‐Yang; Xu, Lu‐Hai; Chen, Jing‐De; Li, Chi; Shen, Su; Lee, Shuit‐Tong; Tang, Jian‐Xin
- Abstract
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.
- Subjects
ORGANIC light emitting diodes; ELECTRIC properties of nanostructured materials; NANOLITHOGRAPHY; SOLID state electronics equipment; SOLID state chemistry
- Publication
Advanced Functional Materials, 2015, Vol 25, Issue 18, p2660
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201500310