Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 29, Pages 33346-33351Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c05646
Keywords
encapsulation; inkjet printing; IJP; micro LED; NaCl; salt; quantum dots; QDs
Funding
- Ministry of Science and Technology (Taiwan) [105-2119-M-007-031]
- Tsing-Yang Technology Inc. [106A0011J4, 108A0008J4]
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A promising method has been demonstrated to fabricate quantum dot (QD)-converted full-color micro-light emitting diodes (LEDs) by inkjet printing (IJP) instead of the mass transfer of three red-green-blue (RGB) color chips. By introducing an additional medium, that is, NaCl into a formulated ink, QD deposition is manipulated by the NaCl-QD adhesive force and the capillary flow inside the liquid drop via varying the substrate hydrophobicity, which enabled spontaneous self-encapsulation of QDs in a single NaCl crystal. An RGB QD@NaCl array with a small pixel size and uniform size distribution (diameter = 3.74 +/- 0.5 mu m) is obtained in the IJP process, which demonstrated a full-color micro-LED display with a color gamut of approximately 110% of the National Television System Committee (NTSC) standard.
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