57‐2: <i>Invited Paper</i>: Latest Development of High‐performance OLED Material Suitable for Printing

Yamada, Takeshi; Akino, Nobuhiko; Tsubata, Yoshiaki; Fukushima, Daisuke; Amamiya, Satoshi; Sekihachi, Jun-ichi

doi:10.1002/sdtp.11786

Cited by 16 publications

(10 citation statements)

References 3 publications

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“…As reported, the lifetime of red QLED has well exceeded 3000 h 11,12,14,15 ; green devices are behind but still capable of 1000 h 14 ; blue QLED is the worst among the three, delivering lifetime just over 20 h 12,14,16 . Comparing with a rival technology, e.g., printed organic light-emitting diodes (OLED), QLED is far behind because inkjet-printed OLED have reached LT95 ( L 0 = 1000 cd m −2 ) of 7000 h for red, 9000 h for green, and 500 h for blue 17,18 .…”

Section: Introductionmentioning

confidence: 99%

On the degradation mechanisms of quantum-dot light-emitting diodes

et al. 2019

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The operating lifetime of blue quantum-dot light-emitting diodes (QLED) is currently a short slab for this emerging display technology. To pinpoint the origin of device degradation, here we apply multiple techniques to monitor the electric-field distribution and space-charge accumulation across the multilayered structure before and after lifetime tests. Evident by charge-modulated electro-absorption and capacitance-voltage characteristics, the excited electrons in blue quantum dots (QD) are prone to cross the type II junction between the QD emission layer and the electron-transporting layer (ETL) due to the offset of conduction band minimum, leading to space-charge accumulation and operating-voltage rise in the ETL. Therefore, unlike those very stable red devices, of which the lifetime is primarily limited by the slow degradation of hole-transporting layer, the poor lifetime of blue QLED originates from the fast degradation at the QD-ETL junction. Materials engineering for efficient electron injection is prerequisite for the boost of operating lifetime.

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Section: Introductionmentioning

confidence: 99%

On the degradation mechanisms of quantum-dot light-emitting diodes

et al. 2019

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“…For years development of inkjet OLED material, the performance of efficiency of inkjet OLED has been improved to a requirement level. [6][7] Beside the efficiency, the most important for inkjet OLED is the lifetime. Comparing to the thermal evaporation OLED, the inkjet OLED still shows poor lifetime.…”

Section: Objective and Backgroundmentioning

confidence: 99%

41‐3: 17.3 Inch UHD Resolution AMOLED Panel Fabricated by Ink Jet Printing Process

Chen

Lin

et al. 2020

Symp Digest of Tech Papers

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We fabricated a 17.3 inch AMOLED panel by using of the inkjet printing process. The panel resolution is UHD (3840x2160) and the pixel density is 255ppi (pixel per inch).The pixel design of the panel is real RGB side-by-side pixel arrangement. We demonstrated that the high resolution OLED panel could be realized with high efficiency material usage by inkjet printing process. Uniformity of top emission OLED structure and device performance including the luminous efficiency and the device lifetime is also discussed in our study.

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“…The inkjet printing (IJP) process based on solution-processable OLED materials is a very attractive technology because it has a high material usage rate and simple OLEDs structure, which allow the process to bring down the material costs for large-size panel fabrication. For the material development, the solutionprocessable OLED material performance has reached the product level [1][2]. For the panel development, the panel size of a 14-inch and the 65-inch panel were produced by the IJP process [3][4].…”

Section: Objective and Backgroundmentioning

confidence: 99%

P‐168: Picture Quality and Uniformity Study on High Resolution Top Emission OLED Display Fabricated by Ink Jet Printing Process

Chen

Hsieh

et al. 2019

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To realize a middle size OLED panel (10~20 inch) manufactured by ink jet printing process. A high resolution OLED panel is needed. Because of high resolution, the top emission OLED is requirement to increase the pixel aperture ratio, lifetime and color gamut. The pixel resolution in our study is 167ppi, which meets the requirement for automotive vehicle application. We discuss the film quality and picture quality from ink jet printing process to address which pixel arrangement design can meet the demand of products. Finally, a 12 inch AMOLED panel is realized in our study.

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57‐2: Invited Paper: Latest Development of High‐performance OLED Material Suitable for Printing

Cited by 16 publications

References 3 publications

On the degradation mechanisms of quantum-dot light-emitting diodes

On the degradation mechanisms of quantum-dot light-emitting diodes

41‐3: 17.3 Inch UHD Resolution AMOLED Panel Fabricated by Ink Jet Printing Process

P‐168: Picture Quality and Uniformity Study on High Resolution Top Emission OLED Display Fabricated by Ink Jet Printing Process

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