High-resolution OLED display with remarkably low power consumption using blue/yellow tandem structure and RGBY subpixels

Yamaoka, Ryohei; Sasaki, Toshiki; Kataishi, Riho; Miyairi, Noriko; Kusunoki, Koji; Kaneyasu, Makoto; Ohsawa, Nobuharu; Seo, Satoshi; Hirakata, Yoichi; Yamazaki, Shunpei; Ono, Koji; Cho, Takayuki; Mori, Hidenori

doi:10.1002/jsid.384

Cited by 6 publications

(3 citation statements)

References 18 publications

(15 reference statements)

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“…It can be seen that the red, green, blue, and yellow colors of the RGBY film are legible. Also, the four colors make RGBY four color display possible, what is beneficial to multicolor display. , Analysis above sufficiently proves that the RGBY film has four typical color states. The unique optical properties of RGBY film are attribute to the compositing of FeHCF and MoOHCF, proving that this novel method for preparing multicolor electrochromic films is feasible.…”

Section: Resultsmentioning

confidence: 99%

Achieved RGBY Four Colors Changeable Electrochromic Pixel by Coelectrodeposition of Iron Hexacyanoferrate and Molybdate Hexacyanoferrate

Zou

Wang

Yang

et al. 2020

ACS Appl. Mater. Interfaces

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Although multicolor electrochromic materials and devices have been studied by many researchers, there is still none an inorganic single-layer film that has red, blue, and green three typical color states, while red, green, and blue (RGB) are indispensably for multicolor display. Iron hexacyanoferrate (FeHCF) is a kind of well-studied inorganic electrochromic material with relatively colorful properties and a great family of analogues. In this Research Article, the RGBY film with red, green, blue and yellow four typical color states are obtained successfully by coelectrodeposition of FeHCF and molybdate hexacyanoferrate (MoOHCF). This film contains the electrochromic properties of both components. Moreover, benefiting from its high A+ (alkali cation ions that can insert/extract into/from the framework, such as Li+ and K+) content, the redox process of RGBY film can be fully completed to achieve rich color variation. The absorptivity adjustment range of RGBY film at 730 and 440 nm are 0.81 and 0.43, respectively. The response time of RGBY films varies from 3 to 30 s between states and maintains its optical properties without significant decay during 1000 cycles. Finally, a pixelated electrode and a facile electrochromic device based on RGBY film have been developed to exhibit its high application potential in nonemission display field.

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Section: Resultsmentioning

confidence: 99%

Achieved RGBY Four Colors Changeable Electrochromic Pixel by Coelectrodeposition of Iron Hexacyanoferrate and Molybdate Hexacyanoferrate

Zou

Wang

Yang

et al. 2020

ACS Appl. Mater. Interfaces

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“…In AMOLED displays, it is important to develop a back plane, i.e., a field-effect transistor, suitable for OLED. Previously, our group discovered c-axis-aligned crystalline indium-gallium-zinc oxide (CAAC-IGZO) and nanocrystal IGZO, which have crystal morphologies different from those of single crystal IGZO and amorphous IGZO [2][3][4][5], and fabricated AMOLED displays using CAAC-IGZO in a backplane [6][7][8][9]. By combining the backplane with OLED technologies for high efficiency, such as an exciplex-triplet energy transfer (ExTET) technology [6,10,11] and a triplet-triplet annihilation technology [6,12,13], an extremely low-power OLED display has been successfully developed [8].…”

Section: Background and Objectivesmentioning

confidence: 99%

26‐2: Extremely High‐Efficient OLED Achieving External Quantum Efficiency over 40% by Carrier Injection Layer with Super‐Low Refractive Index

Watabe

Yamaoka

Ohsawa

et al. 2018

Symp Digest of Tech Papers

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“…Improper doped concentration and preparation methods can lead to a significant reduction in device efficiency. In WOLEDs, the principle of composite white light can be achieved by combining blue, red, and green to form white light [32] or combining blue and yellow to form white light [33][34][35]. The performance of each monochromatic light will significantly impact the resulting white light.…”

Section: Introductionmentioning

confidence: 99%

Tailored efficient and reliable double luminescent layer hybrid WOLEDs via doping engineering

Zhang,

Chang

et al. 2024

Semicond. Sci. Technol.

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Doping engineering has been widely utilized to increase the efficiency of WOLEDs. In this study, a blue phosphor material named DMAC-DPS and an orange phosphor material named PO-01 are integrated into the host materials DPEPO and CBP by incorporating the principle of complementary color luminescence, resulting in a doped double-luminescent layer hybrid WOLED. The developed device structure consists of ITO/MoO3/TCTA/DPEPO:DMAC-DPS/CBP:PO-01 (or CBP:PO-01/DPEPO:DMAC-DPS)/ TAZ/Alq3/LiF/Al. The transfer of energy between the host and guest materials is achieved by controlling the thickness and position of the emitting layer, leading to a more balanced emission of blue and yellow light and an overall increase in device efficiency. The developed WOLED exhibits a maximum current efficiency of 26.8 cd/A, a power efficiency of 16.8 lm/W, and an external quantum efficiency of 10.95%. The stable color coordinates of the device remains consistent, varying from (0.34, 0.40) to (0.33, 0.39) at brightness levels ranging from 100 to 1000 cd/m2. Technically, the incorporation of blue and orange phosphor materials into the host materials DPEPO and CBP, respectively, resulting in a doped double-luminescent layer hybrid WOLED, has shown a more balanced emission of blue and yellow light and resulted in increased efficiency. The reliable color coordinates corroborate the good color stability, making it a promising candidate for various applications. Furthermore, the controlled transfer of energy between the host and guest materials has led to a more balanced emission of blue and yellow light. Our developed doping engineering methods have shown potential for increased efficiency and good color stability, making the developed WOLED a promising candidate for various applications.

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High-resolution OLED display with remarkably low power consumption using blue/yellow tandem structure and RGBY subpixels

Cited by 6 publications

References 18 publications

Achieved RGBY Four Colors Changeable Electrochromic Pixel by Coelectrodeposition of Iron Hexacyanoferrate and Molybdate Hexacyanoferrate

Achieved RGBY Four Colors Changeable Electrochromic Pixel by Coelectrodeposition of Iron Hexacyanoferrate and Molybdate Hexacyanoferrate

26‐2: Extremely High‐Efficient OLED Achieving External Quantum Efficiency over 40% by Carrier Injection Layer with Super‐Low Refractive Index

Tailored efficient and reliable double luminescent layer hybrid WOLEDs via doping engineering

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