Organic wrinkles for energy efficient organic light emitting diodes

Moon, Jaehyun; Kim, Eunhye; Park, Seung Koo; Lee, Keunsoo; Shin, Junhwa; Cho, Doo‐Hee; Lee, Jonghee; Joo, Chul Woong; Cho, Nam Sung; Han, Jun-Han; Yu, Byoung–Gon; Yoo, Seunghyup; Lee, Jeong Ik

doi:10.1016/j.orgel.2015.07.046

Cited by 48 publications

(22 citation statements)

References 27 publications

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“…Moon et al synthesized a liquid prepolymer which spontaneously forms random wrinkles by a single UV exposure step, as is shown in Figure 18b. [97] The authors observed that the efficiency enhancement increases with the wrinkle size (2.5 μm to 5 μm) and depth (250 nm to 700 nm). Due to the randomness of wrinkle distribution, wrinkles can effectively extract light in all directions, resulting in an enhancement of 1.58 times.…”

Section: External Extraction Methodsmentioning

confidence: 99%

Recent Advances in OLED Optical Design

Salehi

Shin

et al. 2019

Adv Funct Materials

443

299

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Organic light-emitting diodes (OLEDs) have become a mainstream display technology in consumer electronics. Self-emitting ability, transparency, true dark tone, and capability of being made flexible, are some of the features of OLED displays, leading to a superior performance compared with liquid crystal displays. In addition to displays, OLEDs are also a strong candidate for lighting applications. Despite great advances in improving the internal quantum efficiency of an OLED to nearly 100%, the external quantum efficiency is still lacking behind due to optical losses. This review reports the latest advances in the optical design of OLEDs that address the external coupling efficiency of OLEDs. Discussed at first are the fundamentals of OLED optics and how the refractive indices of different layers in an OLED stack affect the extraction efficiency. Then, this paper reviews how microlens arrays, scattering layers, and corrugated structures can be used to recover the optical losses and improve the external efficiency, and the general optical designs for different optical structures for light extraction are presented.

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Section: External Extraction Methodsmentioning

confidence: 99%

Recent Advances in OLED Optical Design

Salehi

Shin

et al. 2019

Adv Funct Materials

443

299

View full text Add to dashboard Cite

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“…In flexible OLEDs, the total internal reflection will also occur at interfaces due to the difference of refractive index [ 199 , 200 , 201 ]. However, for the most popular plastic substrates, their refractive index (e.g., ~1.65 for PET) is higher than that of glass.…”

Section: Fundamental Concepts Of Fwoledsmentioning

confidence: 99%

Emergence of Flexible White Organic Light-Emitting Diodes

et al. 2019

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Flexible white organic light-emitting diodes (FWOLEDs) have considerable potential to meet the rapidly growing requirements of display and lighting commercialization. To achieve high-performance FWOLEDs, (i) the selection of effective flexible substrates, (ii) the use of transparent conducting electrodes, (iii) the introduction of efficient device architectures, and iv) the exploitation of advanced outcoupling techniques are necessary. In this review, recent state-of-the-art strategies to develop FWOLEDs have been summarized. Firstly, the fundamental concepts of FWOLEDs have been described. Then, the primary approaches to realize FWOLEDs have been introduced. Particularly, the effects of flexible substrates, conducting electrodes, device architectures, and outcoupling techniques in FWOLEDs have been comprehensively highlighted. Finally, issues and ways to further enhance the performance of FWOLEDs have been briefly clarified.

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“…The planar geometry of OLEDs is an appropriate platform for films like cellulose paper [3]. Various light extraction methods have been suggested to enhance the coupling efficiency of OLEDs [4,5]. The external quantum efficiency of OLED devices is a product of two terms: internal quantum efficiency and outcoupling efficiency.…”

Section: Introductionmentioning

confidence: 99%

Porous cellulose paper as a light out coupling medium for organic light-emitting diodes

Lee

Kang

Park

et al. 2018

Journal of Information Display

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Porous nanocellulose paper was fabricated and applied as a light outcoupling medium. The nanocellulose papers were prepared using cellulose powder and a high-pressure homogenizing process. The translucent nanocellulose paper had high total transmittance and haze, and gave off diffuse light when the incident light passes through it. Through the application of the fabricated nanocellulose paper on the external surfaces of organic light-emitting diode (OLED) devices, it was possible not only to enhance the luminous efficiency but also to widen the angular light distribution. As this paper is intrinsically flexible, it can be applied to various forms of light sources bearing curvature.

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Organic wrinkles for energy efficient organic light emitting diodes

Cited by 48 publications

References 27 publications

Recent Advances in OLED Optical Design

Recent Advances in OLED Optical Design

Emergence of Flexible White Organic Light-Emitting Diodes

Porous cellulose paper as a light out coupling medium for organic light-emitting diodes

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