Institute of Functional Nano & Soft Materials, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University
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DOI:
10.7502/j.issn.1674-3962.2016.08.07
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Abstract:
Organic light-emitting diodes (OLEDs) have gained increasing significance in applications of full-color display panels, wearable intelligent electronics, and eco-friendly interior lighting. Recently, the innovation of material design, device structure, and manufacturing technology has enabled OLED device performance to reach a new stage in terms of large area, long lifetime, high efficiency and color rendering index. Light out-coupling plays a critical role in determining the efficiency of electron-photon conversion processes, so it is of great importance in developing efficient and stable OLEDs to optically manipulating light generated and avoiding intrinsic mode loss. In this review, we emphasize the strategies of light manipulation from the perspective of wavelength dependency, angle sensitivity, and compatibility with device fabrication. Various optical loss channels are analyzed first. Recent developments of mico/nanostructure-stimulated light out-coupling for OLEDs are then overviewed. At last, we introduce our newly developed light manipulation technique using bio-inspired moth-eye nanostructures via soft nanoimprint lithography. This technique enables extremely high current efficiency of 366 cd A-1 for green OLED, power efficiencies of 123.4 lm W-1 and 106 lm W-1 for glass and plastic based white OLEDs respectively, which is expected to help accelerate the commercialization of large-scale and low-cost OLED panels and provide scientific inspiration to advanced device architecture design.