Close-packed hemispherical microlens arrays for light extraction enhancement in organic light-emitting devices

Eom, Sang-Hyun; Wrzesniewski, Edward; Xue, Jiangeng

doi:10.1016/j.orgel.2010.12.021

Cited by 76 publications

(41 citation statements)

References 19 publications

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“…MLAs added to the surface of OLEDs can enhance light output thus improving the overall emission efficiency [96]. Eom et al showed that OLEDs combined with a hemispherical MLA can increase the emission efficiency to up to 70% [97], but a practical limitation is that the fill factor of the hemispherical MLA is never close to 100%. Wei and Su proved that the maximum enhancement of the luminance efficiency of OLEDs with square arrays of hemispherical microlenses is 56% [98].…”

Section: Light Source Devicesmentioning

confidence: 99%

Fabrication, characterization, and applications of microlenses

et al. 2015

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Microlenses (MLs) and microlens arrays (MLAs) are assuming an increasingly important role in optical devices. In response to this rapid evolution in technology, emphasis is being placed on research into new manufacturing methods for these devices as well as the characterization of their performance. This paper provides an overview of the fabrication of MLs and MLAs by electrical, mechanical, chemical, and optical methods. As each processing method has distinct advantages and limitations, the most significant characteristic parameters and the measurement of these parameters are discussed for each method. These parameters are then used as indices to evaluate and improve each of the processing methods. Some examples of practical applications of MLAs, especially for micromechanical optoelectronic devices, are also given. This paper aims to summarize the present development and the state of the art in processing technology of MLs and MLAs.

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Section: Light Source Devicesmentioning

confidence: 99%

Fabrication, characterization, and applications of microlenses

et al. 2015

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“…Among these, light efficiency is considered as an important factor because increasing light efficiency can reduce energy consumption of electronics devices. To obtain higher efficiency, several methods using external light extraction structures have been proposed such as texturing emission surface [5], inserting micro-lens array [6], and photonic crystal [7]. Although these methods have contributed to the development of light extraction technology, there is a limitation that efficiency enhancement can be observed only at top surface of light source.…”

Section: Introductionmentioning

confidence: 99%

P‐67: Printed Reflective Sloped Wall for Enhancing Luminance of ColorConversion Light Source

Lee

Kim

et al. 2019

Symp Digest of Tech Papers

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“…During the organic layer printing process, micro dams need to be fabricated by lithography to define the boundary of the organic layer. Meanwhile, micro lens arrays (MLA) sometimes need to be generated through lithography, nanoimprint, et al [15][16][17][18][19] on specific organic/inorganic layer to enhance the light outcoupling efficiency. The TFE/MLA layer prevents OLED device from oxygen and water and improves the light extraction effect.…”

Section: Introductionmentioning

confidence: 99%

32.2: Multifunctional electrohydrodynamic printing and its industrial applications in flat panel display manufacturing

Duan

Jin³

et al. 2018

Symp Digest of Tech Papers

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Inkjet printing has become a robust, effective and powerful technique for display manufacturing due to its compatibility with large‐area substrates, and cost effectiveness. However, conventional inkjet printing that relies on thermal or piezoelectric actuation falls short to fabricate the high‐resolution components, and is inapplicable to highly viscous materials. Electrohydrodynamic (EHD) printing, which adopts electrical field force to pull the fluid flow from the Taylor cone at the nozzle, exhibits the ultra‐high resolution (even to the nanoscale) and excellent compatibility with highly viscous inks. This paper has presented the promising applications of EHD printing in display manufacturing, e.g. micro dams for boundary definition, organic thin films for encapsulation, and micro lens array for light extraction. Dams with width/thickness of 1∼20 μm/0.5∼3 μm have been directly written on test element group border in a cost‐effective and high‐efficient manner, to replace traditional lithography and etching process in boundary definition. By adopting EHD printing to eject smaller droplets, the thickness of the organic layer in thin film encapsulation has been decreased to less than 6 pm, which is far beyond the current industrial level (8∼12 μm), and making the device to be more flexible. Further, micro lens array with diameters ranging from 3 μm to 20 μm have been directly fabricated on the encapsulation layer of OLED, which make light outcoupling more effective.

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Close-packed hemispherical microlens arrays for light extraction enhancement in organic light-emitting devices

Cited by 76 publications

References 19 publications

Fabrication, characterization, and applications of microlenses

Fabrication, characterization, and applications of microlenses

P‐67: Printed Reflective Sloped Wall for Enhancing Luminance of ColorConversion Light Source

32.2: Multifunctional electrohydrodynamic printing and its industrial applications in flat panel display manufacturing

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