Woo Sik Jeon

HIERARCHICAL PHONIC CRYSTALS WITH BROAD BAND GAPS IN LOW FREQUENCY BY USING HOMOGENIZATION METHOD

Kwang‐Won Lee, Woo Sik Jeon

SOUND ABSORPTION USING A TWO-SCALE CHECKERBOARD META-SURFACE WITH MICRO HELMHOLTZ RESONATORS

Hyeonbin Ryoo, Woo Sik Jeon

ACOUSTIC CLOAK IN THE PRESENCE OF COMPRESSIBLE NON-UNIFORM MEAN FLOW

Hyeonbin Ryoo, Woo Sik Jeon

Thermal Annealing Effect of Subphthalocyanine (SubPc) Donor Material in Organic Solar Cells

Young Hoon Son, Gyeong Woo Kim, Woo Sik Jeon, Ramchandra Pode et autres

We report that the S-shaped kink of current density-voltage (J-V) characteristics, which reduce fill factor of organic photovoltaic cells, can be removed by substrate heating during donor layer deposition process. Subphthalocyanine (SubPc) donor film in combination with buckminsterfullerene (C60) acceptor film has …

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High Mobility Hole Extraction Material for Organic Solar Cell Application

Gyeong Woo Kim, Woo Sik Jeon, Young Hoon Son, Jang Hyuk Kwon et autres

We report a high mobility hole extraction material, N,N,N′,N′,-tetrakis(biphenyl-4-yl)benzidine (TBBD) for organic solar cell applications. Its highest occupied molecular orbital energy value at 5.3 eV is well matched with a donor layer and its high mobility of 1.74 × 10−2 cm2/Vs brings …

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P‐115: Driving Voltage Reduction through Non‐radiative Charge Recombination Interfaces in Organic Light‐Emitting Diode

Young Hoon Son, Woo Sik Jeon, Dae Chul Lim, Jang Hyuk Kwon

Abstract We report a new way for the driving voltage reduction through non‐radiative charge recombination interfaces in organic light‐emitting devices (OLEDs). Non‐radiative charge recombination interfaces made between a hole transporting layer and a deep lowest unoccupied molecular orbital (LUMO) electron transporting layer …

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Highly efficient soluble materials for blue phosphorescent organic light–emitting diode

Nam‐Jin Lee, Dae‐Hee Lee, Dong‐Won Kim, Jihoon Lee et autres

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High current conduction with high mobility by non-radiative charge recombination interfaces in organic semiconductor devices

Woo Sik Jeon, Jung Soo Park, Ling Li, Dae Chul Lim et autres

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Soluble processed low-voltage and high efficiency blue phosphorescent organic light-emitting devices using small molecule host systems

Yoo Jin Doh, Jung Soo Park, Woo Sik Jeon, Ramchandra Pode et autres

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Efficiency Control in Iridium Complex-Based Phosphorescent Light-Emitting Diodes

Boucar Diouf, Woo Sik Jeon, Ramchandra Pode, Jang Hyuk Kwon

Key factors to control the efficiency in iridium doped red and green phosphorescent light emitting diodes (PhOLEDs) are discussed in this review: exciton confinement, charge trapping, dopant concentration and dopant molecular structure. They are not independent from each other but we attempt …

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High Molecular Weight PVK as an Interlayer in Green Phosphorescent OLEDs

Chandramouli Kulshreshtha, Woo Sik Jeon, Yoo Jin Doh, Jang Hyuk Kwon

Performance of high molecular weight polyvinylcarbazole (PVK) (Mn = 1,100,000) as an interlayer has been demonstrated in the green phosphorescent organic light emitting devices (PHOLEDs) using solution process. The PVK interlayer on the surface of PEDOT:PSS has a good film uniformity characteristic …

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High Mobility Electron Transport Material with Pyrene Moiety for Organic Light-Emitting Diodes (OLEDs)

Woo Sik Jeon, Hyoung‐Yun Oh, Jung Soo Park, Jang Hyuk Kwon

We report a new electron transport material, 1,6-di(pyridin-3-yl)-3,8-di(phenyl)pyrene (PPP). It has a very good electron mobility of 4.1 × 10−3 cm2/Vs at the 0.1 MV/cm. This PPP is evaluated along with other electron transport materials such as Alq3 (tris-(8-hydroxyquinoline)aluminum) and Bphen (4,7-diphenyl-1,10-phenanthroline) …

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