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Blue light emission of new anthracene derivatives produced using optimized side group link positions
Kang, Seokwoo,Jung, Hyocheol,Lee, Hayoon,Lee, Suji,Jung, Mina,Lee, Jaehyun,Chul Kim, Young,Park, Jongwook Elsevier 2018 Dyes and pigments Vol.156 No.-
<P><B>Abstract</B></P> <P>Using an anthracene chromophore as a core group and a phenyl carbazole chromophore as a side group, three new emitters of blue light, 2-DCPA, 3-DCPA and 4-DCPA, were synthesized. The three compounds differed with regard to the position of the carbazole linked to the core, with 2-DCPA and 4-DCPA using carbazole nodes and 3-DCPA using the lobe position. Density functional theory calculations were performed to determine which positions of the carbazole moiety had node characteristics and which had lobe characteristics. The PL<SUB>max</SUB> values of 2-DCPA, 3-DCPA and 4-DCPA in the film state were in the blue region, at 453, 457, and 452 nm, respectively. Of these materials, 3-DCPA, i.e., that with the linkage to the lobe position, showed the highest efficiency, with a value of 2.91 cd/A, and EQE, with a value of 2.65%. In a doped device using CBP as a host material and 3-DCPA as a dopant, the EL<SUB>max</SUB> emission was observed to be in the deep blue region, at 433 nm, and with a CIE value of (0.150, 0.068).</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new blue emitter was synthesized by linking different positions of a carbazole to the anthracene. </LI> <LI> The PL<SUB>max</SUB> values of 2-DCPA, 3-DCPA and 4-DCPA in the film state were in the blue region, at 453, 457, and 452 nm. </LI> <LI> 3-DCPA achieved deep blue EL performance of CIE (x, y) value of (0.150, 0.068), 1.61 cd/A, and EQE of 2.74%. </LI> </UL> </P>
Kang, Seokwoo,Jung, Hyocheol,Lee, Hayoon,Shin, Donghee,Park, Miyeon,Kay, Kwang-Yol,Park, Jongwook Informa UK (TaylorFrancis) 2017 Molecular Crystals and Liquid Crystals Vol.651 No.1
<P>Four emitting compounds, namely, 2,8-Bis-(10-phenanthren-9-yl-anthracen-9-yl)-6H,12H-5,11-methano-dibenzo[b,f][1,5]diazocine(AK-4), 2,8-Bis-(10-pyren-1-yl-anthracen-9-yl)-6H,12H-5, 11-methano-dibenzo[b,f][1,5]diazocine(AK-5), 2-[10-(9,9-Dimethyl-9,9a-dihydro-4aH-fluoren-2-yl)-anthracen-9-yl]-8-[10-(9,9-dimethyl-9H-fluoren-2-yl)-anthracen-9-yl]-6H,12H-5,11-methano-dibenzo[b,f][1,5]diazocine(AK-6) and 2,8-Bis-[10-(spiro-fluroene)-anthracen-9-yl]-6H,12H-5,11-methano-dibenzo[b,f][1,5]diazocine(AK-7) were synthesized through Suzuki-coupling reaction. Physical properties such as optical, electroluminescent properties were investigated. UV-Visible spectrum of AK-4, AK-5, AK-6 and AK-7 in film state showed maximum 372, 374, 372 and 373nm. PL spectrum of AK-4, AK-5, AK-6 and AK-7 showed maximum emission wavelength of 437, 451, 445 and 493nm. Four compounds were used as EML in OLED device: ITO/2-TNATA(60nm)/NPB(15nm)/EML(35nm)/Alq(3)(20nm)/LiF(1nm)/Al(200nm). AK-6 OLED device showed C.I.E. value of (0.16, 0.20) and luminance efficiency of 2.67 cd/A.</P>
Synthesis and Property of New Propeller Shaped Emitting Materials for Organic Light-Emitting Devices
Kang, Seokwoo,Lee, Hayoon,Kim, Beomjin,Park, Youngil,Park, Jongwook American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.3
<P>New propeller type emitting compound, namely 3,6-di-anthracen-9-yl-9,10-bis-(4-anthracen-9-yl-phenyl)-phenanthrene[TAnDAP] and 3,6-bis-(10-phenyl-anthracen-9-yl)-9,10-bis-[4-(10-phenylanthracen-9-yl)-phenyl]-phenanthrene [TAnPDAP] were synthesized through Suzuki and McMurry reactions. We investigated their physical properties such as optical, electrochemical, and electroluminescent properties. The two compounds were used as an emitting layer in OLED devices: ITO/2-TNATA (60 nm)/NPB (15 nm)/non-doped: TAnDAP or TAnPDAP (35 nm)/Alq3 (20 nm)/LiF (1 nm)/Al (200 nm). The TAnDAP OLED device showed C.I.E. value of (0.28, 0.41) and luminance efficiency of 3.81 cd/A at 10 mA/cm(2). The TAnPDAP device showed C.I.E. value of (0.20, 0.27) and high luminance efficiency of 5.40 cd/A at 10 mA/cm(2). TAnPDAP was found to show better luminance efficiency and C.I.E. value than TAnDAP because it has a bulky 9-phenylanthracene.</P>
New optimized triazene radical initiators for thermal polymerization
Kang, Seokwoo,Jeong, Jinwook,Kim, Beomjin,Park, Young Il,Noh, Seung Man,Park, Jongwook Elsevier 2019 Journal of industrial and engineering chemistry Vol.79 No.-
<P><B>Abstract</B></P> <P>New phenyl-triazine-containing thermal radical initiators (TRIs), namely 3,3-dimethyl-1-phenyltriazene (BTAM), 3,3-diethyl-1-phenyltriazene (BTAE), 2,2,6,6-tetramethyl-1-(phenyldiazenyl)piperidine (BTACM), 2,2,6,6-tetramethyl-1-(phenyldiazenyl)piperidin-4-ol (BTACH−OH), and 2,2,6,-tetramethyl-1-(phenyldiazenyl)piperidin-4-ol (BTACM−OH), were designed and synthesized for use in radical polymerization. The method used to synthesize the initiators was simple, and the synthesized initiators did not change the color of the polymer. For these five new initiators as well as four related previously designed ones, the polymerization conversion rate was in each case over 92%. BTACM, which also included a six-membered aliphatic ring substituted with two dimethyl groups, showed a polymerization time 81.9% less than that without initiator and showed according to DSC experiments the lowest peak polymerization temperature of 137°C. These results represent a new promising thermal initiator system expected to be effective for various applications, especially those involving polymer coating.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Highly efficient chrysene emitters based on optimized side groups for deep blue emission
Kang, Seokwoo,Lee, Hayoon,Jung, Hyocheol,Jo, Minjin,Jung, Mina,Park, Jongwook Elsevier 2018 Dyes and pigments Vol.156 No.-
<P><B>Abstract</B></P> <P>Diphenylamine substituted with methyl groups was used as a side group to realize high efficiency chrysene deep blue emitters. Three chrysene derivatives substituted with side groups were successfully synthesized: tetra-o-tolylchrysene-6,12-diamine (o-DPAC), tetra-m-tolylchrysene-6,12-diamine (m-DPAC), and tetra-p-tolyl-chrysene-6,12-diamine (p-DPAC). The maximum PL (Photoluminescence) emission wavelengths of the three materials in solution and in a film were shortest for o-DPAC and longest for p-DPAC. The highly twisted structure of o-DPAC showed the narrowest FWHM (47 nm) in the deep blue region with a PL<SUB>max</SUB> of 449 nm in the film state. The three synthesized materials showed excellent thermal stability with a high T<SUB>d</SUB> over 370 °C. EML was applied to a non-doped OLED device considering the band gap of synthesized materials. Among the synthesized materials, the m-DPAC device achieved excellent EL performance of CIE x, y (0.14, 0.09), 4.89 cd/A, 3.60 lm/W, and an EQE of 6.18%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Diphenylamine substituted with methyl groups was used as a side group to realize high efficiency chrysene deep blue emitters. </LI> <LI> The synthesized emitters showed excellent thermal stability with a high T<SUB>d</SUB> over 370 °C. </LI> <LI> m-DPAC compound achieved excellent blue EL performance of CIE x, y (0.14, 0.09), 4.89 cd/A, and an EQE of 6.18%. </LI> </UL> </P>
Bilateral, multifocal renal tumors diagnosed as Birt-Hogg-Dubi syndrome by genetic analysis
( Seokwoo Park ),( Sehoon Park ),( Eunjeong Kang ),( Dong Ki Kim ),( Kwon Wook Joo ),( Yon Su Kim ),( Hajeong Lee ) 대한내과학회 2015 대한내과학회 추계학술발표논문집 Vol.2015 No.1
Birt-Hogg-Dubi syndrome (BHD) is an autosomal dominant cancer susceptibility syndrome characterized by skin fibrofolliculomas, pulmonary cysts and spontaneous pneumothorax, and renal cancers. The syndrome is caused by various mutations of the FLCN gene located in 17p11.2 encoding folliculin. The risk of renal cancer is seven times higher in BHD-affected patients. Bilateral, multifocal and chromophobe renal cell carcinoma is characteristic of renal cancers in BHD. Among about 110 pathogenic mutations reported in BHD, only twenty six of them have been associated with renal cancer. In this study, we described a case of 50-year-old woman with chromophobe renal cell carcinoma who had c.1557delT mutation in the FLCN gene. A 50-year-old-woman presented with flank pain for the past 2 weeks. Computed tomography (CT) of her abdomen and pelvis showed multifocal tumors with heterogeneous enhancement in both kidneys, including a 3.5-cm mass on the upper pole of the right kidney. To differentiate metastatic cancer from primary kidney tumors, we performed positron emission tomography (PET)-CT, which showed no other hypermetabolic lesions. Her chest CT showed a few lentiform cysts of up to 1.5 cm in both lower lungs. A needle biopsy revealed that the 3.5-cm mass was a chromophobe renal cell carcinoma. Given multifocal distribution of the renal cell carcinoma, we suspected an inherited type of kidney cancer, such as Von Hippel-Lindau disease or BHD. In the current case, the cystic change of both lungs and chromophobe renal cell carcinoma pointed towards the possibility of BHD. DNA sequencing of the entire FLCN gene using mononuclear cells found out a heterozygous c.1557delT mutation in exon 14 [p.Phe (TTT) 519Leu (TTA) fs*18]. A son and a daughter of the patient also went through the genetic analysis which illustrated the same mutation, although both of them did not have any clinical signs suggesting BHD. Considering that renal cancer might be the principal determinant of life expectancy, early suspicion and diagnosis of BHD is crucial. In our patient, identification of genetic mutation aided in the diagnosis which is novel DNA sequence variation in BHD-associated renal cancers.