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Ultrathin Quantum Dot Display Integrated with Wearable Electronics
Author(s) -
Kim Jaemin,
Shim Hyung Joon,
Yang Jiwoong,
Choi Moon Kee,
Kim Dong Chan,
Kim Junhee,
Hyeon Taeghwan,
Kim DaeHyeong
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201700217
Subject(s) - wearable computer , brightness , materials science , electroluminescence , optoelectronics , wearable technology , quantum dot , light emitting diode , pixel , display device , diode , active matrix , electronics , computer science , electrical engineering , nanotechnology , optics , computer vision , embedded system , thin film transistor , layer (electronics) , physics , engineering , operating system
An ultrathin skin‐attachable display is a critical component for an information output port in next‐generation wearable electronics. In this regard, quantum dot (QD) light‐emitting diodes (QLEDs) offer unique and attractive characteristics for future displays, including high color purity with narrow bandwidths, high electroluminescence (EL) brightness at low operating voltages, and easy processability. Here, ultrathin QLED displays that utilize a passive matrix to address individual pixels are reported. The ultrathin thickness (≈5.5 µm) of the QLED display enables its conformal contact with the wearer's skin and prevents its failure under vigorous mechanical deformation. QDs with relatively thick shells are employed to improve EL characteristics (brightness up to 44 719 cd m −2 at 9 V, which is the record highest among wearable LEDs reported to date) by suppressing the nonradiative recombination. Various patterns, including letters, numbers, and symbols can be successfully visualized on the skin‐mounted QLED display. Furthermore, the combination of the ultrathin QLED display with flexible driving circuits and wearable sensors results in a fully integrated QLED display that can directly show sensor data.