- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Pyrene[4,5-d]imidazole-based Derivatives with Hybridized Local and Charge Transfer State for Highly Efficient Blue and White Organic Light-emitting Diodes with Low Efficiency Roll-off
摘要： A family of pyrene[4,5-d]imidazole derivatives, PyPA, PyPPA, PyPPAC and PyPAC, with different excited state are successfully developed. Among them, PyPPA and PyPPAC possess hybridized local and charge transfer (HLCT) state endowing them with pure blue fluorescence as well as high quantum yields. The nondoped organic light-emitting diode (OLED) based on PyPPA displays Commission Internationale de L’Eclairage coordinates of (0.14, 0.13) and achieves a maximum external quantum efficiency (EQE) of 8.47%, which are among the highest value reported to date for nondoped blue HLCT OLEDs. The nondoped OLED based on PyPPAC exhibits a maximum luminance of 50046 cd m-2 locating in blue region with CIE coordinates of (0.15, 0.21) and harvests the EQE of 6.74% even when the luminance reached over 10000 cd m?2. In addition, they both reveal ultimate exciton utilizing efficiencies of nearly 100%. The potential of blue emitter of PyPPA with HLCT character for application in white OLED (WOLED) is further tested. The efficient two-color hybrid warm WOLED is successfully achieved, which provides the total EQE, power efficiency and current efficiency of up to 21.19%, 61.46 lm W?1 and 62.13 cd A?1, respectively. The nondoped blue OLEDs and hybrid WOLEDs present good color stabilities with low efficiency roll-offs. Our results prove that taking advantage of the HLCT state, nondoped blue OLEDs as well as hybrid WOLEDs with high performance could be realized, which have a promising prospect for the displays and lightings in the future.
关键词： white OLED,blue luminophore,nondoped blue OLED,HLCT state,pyrene-imidazole
更新于2025-09-23 15:19:57
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7.2: <i>Invited Paper:</i> High Efficiency Internal Extraction Substrate for OLED Lighting
摘要： FOL’s OCEANCLEAR series high-efficiency IES (internal extraction structure) substrates have actually been applied to Gen-II line for mass production. White OLED panels made on basis of the IES substrates show a power efficacy of around 95lm/W at 1000cd/m2. A candlelight-style desk lamp used IES panel shows a color temperature of around 1700k, a power efficacy of 60lm/W at 1000cd/m2. Mass production of IES substrates where achieved by two key technologies: one-layer coating method and heat-resisting carrier resin formation.
关键词： white OLED,internal extraction,light extraction,candle light OLED,extraction substrate,lighting,OLED
更新于2025-09-11 14:15:04
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White organic light-emitting diode (OLED) microdisplay with a tandem structure
摘要： Microdisplay is a key technology for realizing augmented reality (AR) and mixed reality (MR) devices, which have attracted much attention of late. Even though the operating voltage in the tandem structure is higher than that in the single structure, 2-stack tandem OLED exhibited 20,000 cd/m2 at 9 V, which is compatible with CMOS circuit driving. Due to its top-emitting geometry with a tandem structure, the OLED device with a well-controlled thickness exhibited a white spectrum with (0.26, 0.26) color coordinates. The pixel density of the fabricated microdisplay panel with a white tandem OLED was about 2350 pixels per inch, and the active area of the panel was 0.7 inch diagonally. The resolution of the panel was 1280 × 1024, corresponding to SXGA, and the maximal luminance was 3,000 cd/m2.
关键词： white OLED,tandem,Organic light-emitting diode (OLED),microdisplay
更新于2025-09-11 14:15:04