P-195: Enhanced Light Out-Coupling Efficiency of OLEDs with Self-organized Microlens Arrays

Huang, Wen Kuei; Wang, Wen Sheng; Kan, Hui Chun; Chen, Fang‐Chung

doi:10.1889/1.2433683

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…Different kinds of microlens array on the substrate surface have also been employed in some researches and showed obvious enhancement in device efficiency. The microlens array using prepolymer NOA65 material was fabricated on the substrate which was prepatterned by microcontact printing of hydrophobic self-assembled monolayers, and the light outcoupling efficiency was improved by 24.5% without any apparent color change [16]. Spherical microlens pattern using photoresist material was designed on the backside of OLEDs substrate by conventional etching method to minimize the total internal reflection loss at substrate/air interface, and an enhancement of 1.65 could be obtained with high refractive index glass as substrate [17].…”

Section: Introductionmentioning

confidence: 99%

Improving Light Outcoupling Efficiency for OLEDs with Microlens Array Fabricated on Transparent Substrate

Wang

2014

Journal of Nanomaterials

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Low light outcoupling efficiency restricts the wide application of organic light-emitting diodes in solid state light market although the internal quantum efficiency of the device could reach near to 100%. In order to improve the output efficiency, different kinds of microlens array on the substrate emission surface were designed and simulated using light tracing method. Simulation results indicate that the microlens array on the substrate could efficiently improve the light output efficiency and an enhancement of 1.8 could be obtained with optimized microlens structure design. The microlens array with semicircle shape using polymer material was fabricated on glass substrate by a facile approach. Finally, the organic device with microlens array substrate was manufactured and the light output of the device with surface microlens structure could increase to 1.64 times comparing with the device without microlens.

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Section: Introductionmentioning

confidence: 99%

Improving Light Outcoupling Efficiency for OLEDs with Microlens Array Fabricated on Transparent Substrate

Wang

2014

Journal of Nanomaterials

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“…The effectiveness of surface structures (different geometries and materials of microlens) for the light extraction enhancement has been explored by different authors. The microlens array (MLA) using prepolymer NOA65 material was fabricated on the substrate by microcontact printing of hydrophobic self-assembled monolayers, and the light outcoupling efficiency was improved by 24.5% without any apparent color change [18]. Spherical microlenses patterns using photoresist material were designed on the backside of OLEDs substrate by conventional etching method to minimize the total internal reflection loss at substrate/air interface, and an enhancement of 1.65 could be obtained with high refractive index glass as substrate [19].…”

Section: Introductionmentioning

confidence: 99%

To Enhance Light Extraction for Organic Light-Emitting Diodes by Body Modification of Substrate

Wang

Jiang

2013

International Journal of Photoenergy

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A facile approach of body modification on substrate is introduced to enhance the light extraction for organic devices. The lateral metal reflective film (LMRF) was coated on side of substrate and microlens array (MLA) was fabricated on forward surface of substrate. The two methods of improving light output are simulated and optimized to form body modification. The metal thin film was evaporated on the side of reversal trapezoid shape substrate to form LMRF layer and the MLA with semicircle shape was fabricated on the substrate using normal photolithography process. The external quantum efficiency of fabricated organic device with body modification is ~1.8 times higher than the device with normal substrate.

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“…Several other reports about the increase in the light out-coupling efficiency of OLEDs using a microlens have been published thus far. [6][7][8][9][10][11][12][13][14][15][16][17][18] Moreover, the emission angle control of OLEDs using a lens was reported. 19) However, a collimated OLED light source using a microlens has not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

Collimated Light Source Using Patterned Organic Light-Emitting Diodes and Microlens

Aratani

Adachi

Shimizu

et al. 2010

Jpn. J. Appl. Phys.

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We developed for the first time a collimated organic light-emitting diode (OLED) light source using a patterned OLED and a microlens. The structure of the collimated OLED light source was designed by conventional ray-tracking simulation. We demonstrated that the collimated OLED light source enhanced the luminance of a liquid crystal display (LCD) with a low aperture ratio by a factor of more than two compared with a conventional OLED light source, which was not patterned. The collimated OLED light source with the patterned OLED and microlens is thus very effective for achieving a highly efficient LCD with OLED backlight. #

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P-195: Enhanced Light Out-Coupling Efficiency of OLEDs with Self-organized Microlens Arrays

Cited by 4 publications

References 4 publications

Improving Light Outcoupling Efficiency for OLEDs with Microlens Array Fabricated on Transparent Substrate

Improving Light Outcoupling Efficiency for OLEDs with Microlens Array Fabricated on Transparent Substrate

To Enhance Light Extraction for Organic Light-Emitting Diodes by Body Modification of Substrate

Collimated Light Source Using Patterned Organic Light-Emitting Diodes and Microlens

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