Korean Scientists Develop Ultra-thin Deformable QLEDs
Intaglio transfer printing technique achieves 14,000cdm-2 at 7V
Scientists from the Institute for Basic Science (IBS) and Seoul National University in Korea have developed ultra-thin wearable quantum dot light emitting diodes (QLEDs) that they say can be applied to human skin like a sticker. The work was published in Nature Communications.
The team developed a red, green, and blue QLED array, whose resolutions approached 2,500 pixels per inch. The intaglio transfer printing technique, they say, is adaptable for low-voltage-driven pixelated white quantum dot light-emitting diodes and electronic tattoos, showing the best electroluminescence performance (14,000cdm-2 at 7V) among the wearable light-emitting diodes reported up to date. The technique is also said to be readily scalable over a large area.
The device performance is stable on flat, curved and convoluted surfaces under mechanical deformations such as bending, crumpling and wrinkling. The researchers believe that these deformable device arrays highlight new possibilities for integrating high-definition full-colour displays in wearable electronics.
'Wearable red-green-blue quantum dot light-emitting diode array using high-resolution intaglio transfer printing' by Moon Kee Choi et al; Nature Communications, DOI: 10.1038/ncomms8149
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