Enhancement of Optical Efficiency in White OLED Display Using the Patterned Photoresist Film Dispersed With Quantum Dot Nanocrystals

Kim, Hyo-Jun; Shin, Min‐Ho; Hong, Hyun-Guk; Song, Bo-Sun; Kim, Soo-Kang; Koo, Wonhoe; Yoon, Jonggeun; Yoon, Soo‐Young; Kim, Young-Joo

doi:10.1109/jdt.2015.2503401

Cited by 52 publications

(25 citation statements)

References 31 publications

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“…In this study, a nanopatterned QD film 24 , 25 was fabricated by nanoimprint lithography (NIL) and spin coating for use in transparent displays ( e.g ., HUDs) 26 , 27 . The fabricated film not only allows QD emission wavelength tuning by the choice of QD dimensions, but also modulates the emission intensity via nanopatterning.…”

Section: Introductionmentioning

confidence: 99%

Transparent Displays Utilizing Nanopatterned Quantum Dot Films

Shin

Hwang

Zhao

et al. 2018

Sci Rep

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We report the realization of a transparent display using glass covered by a nanopatterned quantum dot (QD) film with good transmittance. The film was fabricated by nanoimprint lithography (NIL) and spin coating of colloidal QDs with specificexcitation maxima. The produced nanopatterned QD film was attached to transparent glass, enabling active image generation using a laser light source of a specific wavelength. Selective light emission was induced by strongly exciting the laser-exposed film surface, creating desired images, with color modulationenabled by controlling the QD layer (dozens of nanometers in size) via nanopatterning. The nanopatterned QD film used for image generation exhibits excellent transmittance (>80%), and can be used for transparent displays, with image realization in both bright and dark spaces. The fabricated displays have wide viewing anglesowing to their good light emission characteristics, and the fabrication through spin coating renders the fabrication process simple and applicable to large areas.

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Section: Introductionmentioning

confidence: 99%

Transparent Displays Utilizing Nanopatterned Quantum Dot Films

Shin

Hwang

Zhao

et al. 2018

Sci Rep

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“…In order to integrate the QD to LCD as patterned film under CF, it is important to make QD patterning with thin thickness and high concentration of QDs. In our previous report, the patterned QD film was developed in a thickness of 2 μm with 30 wt% concentration of QDs by lithography process through dispersing the QD in photoresist (PR) properly [7]. In this research, a patterned QD film in a thickness of 10 μm was fabricated using the similar method in the previous report.…”

Section: Design Conceptmentioning

confidence: 97%

61-2: Optical Efficiency Enhancement in Wide Color Gamut LCD by a Patterned Quantum Dot Film and Short Pass Reflector

Kim

Shin

Kim

et al. 2016

SID Symposium Digest of Technical Papers

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Liquid-crystal display (LCD) with patterned quantum dot (QD) film and short-pass reflector (SPR) was proposed and has an advantage for dramatically enhancement of optical efficiency compared to LCD prepared with a mixed QD film (reference). In proposed LCD structure, the optical power in blue, green, and red color was increased by 869%, 256%, and 85% compared with the reference, respectively. This enhancement comes from the two facts; 1) blue backlight is converted to green or red light separately by each patterned green or red QD film entered directly to each CF without any different color cut, 2) SPR reflects the backward emission of QD to forward direction, preventing the absorption loss of backward emission by back light unit. Additionally, we obtained high color gamut of NTSC 125% in our proposed LCD using a broad-band CF while maintaining the maximum optical intensity with relatively high CF transmittance. Author KeywordsLiquid-crystal display (LCD); quantum dot (QD); nanocrystal; patterned QD film; short-pass reflector (SPR); optical efficiency.

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“…Quantum dots (QD) have been widely used in display fields due to their unique optical properties such as high quantum yield, broad absorption, and narrow emission bands [1]. In previous researches, we proposed and published new approaches to improve the optical efficiencies of white organic light emitting diodes (OLED) display and liquid-crystal display (LCD) by applying the patterned QD film dispersed in photoresist (PR) to down-covert the blue light to necessary green or red light [2]- [4]. However, both technical limitations of thin film thickness (about 2m) and relatively low QD concentration (maximum 20 wt%) of the patterned QD film made it difficult to absorb all the blue light in thin QD film.…”

Section: Introductionmentioning

confidence: 99%

52.2: Invited Paper: Application of Quantum‐dot Patterned Film with Scattering Nanoparticles for the High Efficiency Displays

Kim

et al. 2019

Symp Digest of Tech Papers

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Quantum dot (QD) as a color converting material in the form of patterned film can effectively improve the optical efficiency of displays. Since all of the light passing through the QD film cannot be fully down‐converted, however, novel structure or materials are required to improve the light down‐converting efficiency in the QD film. TiO2 and wrinkled silica particles are respectively applied as scattering nanoparticles which can increase optical path of light in this study. From experimental results, it was confirmed that optical efficiencies of red and green light in white OLED prepared with QD and TiO2 were enhanced further by 57.3% and 17.5%, respectively. In addition, the QD‐converting efficiency to green light from blue µ‐LED was increased using wrinkled silica‐QD hybrid particles, resulting in the enhanced luminous efficacy of 13.1lm/W with 15wt% QD concentration.

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Enhancement of Optical Efficiency in White OLED Display Using the Patterned Photoresist Film Dispersed With Quantum Dot Nanocrystals

Cited by 52 publications

References 31 publications

Transparent Displays Utilizing Nanopatterned Quantum Dot Films

Transparent Displays Utilizing Nanopatterned Quantum Dot Films

61-2: Optical Efficiency Enhancement in Wide Color Gamut LCD by a Patterned Quantum Dot Film and Short Pass Reflector

52.2: Invited Paper: Application of Quantum‐dot Patterned Film with Scattering Nanoparticles for the High Efficiency Displays

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