Journal
ADVANCED OPTICAL MATERIALS
Volume 9, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202002129
Keywords
inkjet printing; PMMA; QD– polymer composite; quantum dot light‐ emitting diodes; subpixels
Categories
Funding
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MOTIE, Korea) [20010737, 20010371]
- Samsung Display Center
- Korea Evaluation Institute of Industrial Technology (KEIT) [20010371] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [4120200113758] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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By introducing PMMA into QD inks, this study achieved enhanced performance of inkjet-printed QLEDs. The uniform droplets formed and reduced nonuniformity in QD morphology, showing potential application prospects in the fabrication process of full-color QLED displays.
Inkjet printing of colloidal quantum dots (QDs) is considered a promising technology for application in full-color quantum dot light-emitting diode (QLED) displays. However, QLEDs that are inkjet printed in a pixel-defining bank structure generally exhibit a low performance, mainly due to the nonuniformity in its QD morphology. In this study, an enhanced performance of inkjet-printing-based pixelated QLEDs is achieved by introducing small amounts of poly(methyl methacrylate) (PMMA) of different molecular weights into QD inks. When this QD-PMMA composite ink is adopted, uniform droplets are formed, originating from contact line depinning during drying. Inside the bank structure, the inkjet-printed QD-PMMA composite film shows a smooth surface and little pileup at the bank edges. A pixelated QLED with PMMA with a molecular weight of 8 kDa exhibits the highest luminance of 73 360 cd m(-2) and an external quantum efficiency of 2.8%, which are remarkably higher than that of the inkjet-printed QLED subpixels without PMMA. The result is verified through the observation of the drying process and the QLED subpixel shapes under operation. Thus, inkjet-printed QD-PMMA composite inks can be a promising strategy for future research on pixelated QLEDs for the fabrication process of full-color QLED displays.
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