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Lee, Yongsu,Lee, Hyeonwoo,Jang, Jaeeun,Lee, Jihee,Kim, Minseo,Lee, Jaehyuk,Kim, Hyunki,Yoo, Seunghyup,Yoo, Hoi-Jun IEEE 2017 IEEE journal on emerging and selected topics in ci Vol.7 No.1
<P>A sticker-type system with hybrid integration of CMOS IC and organic optical sensors is proposed to monitor photoplethysmogram (PPG) signals. To solve problems with the previous solely organic sensor-based works, CMOS IC is implemented in 180 nm technology under 5 V/1.5 V dual power supply. The silver-wire printed planar-fashionable circuit board (P-FCB) is used to connect the CMOS IC with organic sensors. The proposed hybrid system has the five following key features: 1) Power-efficient structure of organic sensor; 2) Integrated analog front-end and digital processor; 3) Degradation compensation scheme; 4) Large parasitic elements optimized design; and 5) Motion artifact rejection scheme. The stickertype PPG monitoring system has mass of only 2g, including the batteries, and consumes only 233 mu W to operate. The PPG signal could be acquired from various body parts (finger, wrist, and neck). The peripheral oxygen saturation level (SpO(2)) extraction results are verified by comparison with a commercial sensor device.</P>
Lee, Seunghyup,Kim, Wooseok,Yong, Kijung WILEY‐VCH Verlag 2011 ADVANCED MATERIALS Vol.23 No.38
<P><B>Water‐resistant electronic devices</B> are developed based on superhydrophobic nanostructures. A ZnO resistive switching device is tested as a model system. The application of superhydrophobic nanostructures on device surfaces efficiently blocks the direct contact of water with electronic components and the devices work even when water is poured on the surface of the device.</P>
Lee, Young Hoon,Park, Sunghee,Oh, Jihun,Shin, Jong Won,Jung, Jaehoon,Yoo, Seunghyup,Lee, Min Hyung American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.28
<P>A synthetic approach to highly efficient thermally activated delayed fluorescence (TADF) is proposed that uses ortho donor (D) acceptor (A) compounds (PXZoB, DPAoB, and CzoB), wherein the acceptor is based on triarylboron and the donor is phenoxazine (PXZ), diphenylamine (DPA), or carbazole (Cz). Combined with the ortho D-A connectivity, the bulky nature of the triarylboron endows the D-A dyads with inherent steric 'locking' for a highly twisteD-Arrangement, leading to a small energy difference between singlet and triplet excited states (Delta E-sT) and thus exhibiting very efficient TADF with microsecond-range lifetimes. In sharp contrast, the Corresponding para D-A derivatives, DPApB and CzpB, only display short-lived, normal fluorescence. Organic light-emitting diodes (OLEDs) incorporating the proposed ortho D-A compounds as emitters display orange, greenish-blue, and pure blue emission and exhibit high external quantum efficiency (eta(EQE)). In particular, the pure blue OLEDs based on the proposed ortho D-A emitters with a carbazole donor (CzoB) show a record-high eta(EQE) of 22.6% with CIE color coordinates of (0.139, 0.150), well illustrating the validity of the proposeD-Approach. Upon optical optimization, the eta(EQE) is further improved to 24.1%.</P>
Lee, Keunsoo,Lee, Jonghee,Kim, Eunhye,Lee, Jeong-Ik,Cho, Doo-Hee,Lim, Jong Tae,Joo, Chul Woong,Kim, Joo Yeon,Yoo, Seunghyup,Ju, Byeong-Kwon,Moon, Jaehyun IOP 2016 Nanotechnology Vol.27 No.7
<P>An optical functional film applicable to various lighting devices is demonstrated in this study. The phase separation of two immiscible polymers in a common solvent was used to fabricate the film. In this paper, a self-organized lens-like structure is realized in this manner with optical OLED functional film. For an OLED, there are a few optical drawbacks, including light confinement or viewing angle distortion. By applying the optical film to an OLED, the angular spectra distortion resulting from the designed organic stack which produced the highest efficiency was successfully stabilized, simultaneously enhancing the efficiency of the OLED. We prove the effect of the film on the efficiency of OLEDs through an optical simulation. With the capability to overcome the main drawbacks of OLEDs, we contend that the proposed film can be applied to various lighting devices.</P>
Lee, Seunghyup,Lee, Junghan,Park, Jinjoo,Choi, Youngwoo,Yong, Kijung WILEY‐VCH Verlag 2012 ADVANCED MATERIALS Vol.24 No.18
<P><B>The resistive switching (RS) characteristics of a tungsten oxide (WO<SUB>x</SUB>)‐Au core‐shell nanowire device array</B> is demonstrated for the first time. In addition to the stable bipolar RS characteristics, the nanowire structure of our RS devices provides superhydrophobic properties. The superhydrophobic RS nanowires repelled water that was poured over, such that the device was protected from failure by water contact‐driven leakage currents. Moreover, surprisingly, the devices still work even with when the device is submerged underwater.</P>