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차재령,곽완규,이칠원,공명선 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Novel fused ring spiro compounds, 3,9-di(di-p-tolyl)aminospiro[benzo [de]anthracene-7,9'-fluorene] (D1) and 3,9-di(di-4-biphenyl)aminospiro [benzo[de]anthracene-7,9'-fluorene] (D2) were designed and synthesized as fluorescent blue dopant materials. These compounds are light yellowish green in color and emit a sky-blue light in their photoluminescence. They possess a decomposition temperature of over 420°C and glass transition temperature of 148°C and 186°C, respectively. More fused ring compounds, 1-(2-naphthyl)-10-(2-(6-phenyl)naphthyl)spiro[benzo [ij]tetraphene-7,9'-fluorene] (H3) was used as a blue host material and the electroluminescence (EL) characteristics of such were evaluated. The EL devices made of indium tin oxide (150 nm)/N,N’-diphenyl-N,N’- bis[4-(phenyl-m-tolyl-amino)phenyl]-biphenyl-4,4’-diamine (DNTPD, 60 nm)/N,N,N’,N’-tetra(1-biphenyl)-biphenyl-4,4’-diamine (TBB, 30 nm/ H3 hosts: D1 or D2 dopant (30 nm, 5 %)/9,10-di(naphthalene-2-yl) anthracen-2-yl-(4,1-phenylene)(1-phenyl-1H-benzo[d]imidazole) (LG201, 20 nm)/LiF (1 nm)/Al (200 nm) were fabricated and characterized. The EL spectra of the devices with films fabricated via vacuum vapor deposition using an H3 host doped with D1 and D2 are similar to the PL spectrum of the solid thin film. At a 5% concentration for D1, a blueemitting OLED was realized with an emission peak at 472 nm, a maxi mum luminance efficiency of 8.91 cd/A and an external quantum efficiency of 5.16% with a current density of 11.31 mA/cm<sup>2</sup>.
차재령,공명선 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
We examined the effect of electrode fingers and gaps of coplanar interdigitated electrode (IDE) structures to characterize the ammonium salt-containing polyelectrolyte film of resistance-based humidity sensors. IDEs designed for this purpose were flexible gold electrodes deposited on a polyimide substrate using a printing process because the geometry presents a potential for tunable sensitivity over other electrode designs. The basic design of the sensors consisted of IDEs with a different number of electrode fingers such as 3, 4, and 5 and gap sizes of 310, 360, 410, and 460 μm. Details of the AC complex impedance characteristics such as the Nyquist plot, Bode plot, and activation energy based on electrode construction were investigated.
차재령,이칠원,공명선 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.11
Highly efficient sky-blue organic light emitting devices (OLEDs) were fabricated using fused-ring spiro host materials 1,10-di(2-naphthyl)spiro[benzo[ij]tetraphene-7,9′-fluorene] (H1 ) and 1-[1-(4-biphenyl)]-10-phenylspiro[benzo[ij]tetraphene-7,9′-fluorene] ( H2 ). H1 and H2 were doped with a fluorescent dopant based on 5,9-di(di-p-tollylaminospiro[benzo[c]fluorene-7,9′-fluorene] ( D3 ). Typical blue fluorescent OLEDs were fabricated with indium tin oxide (ITO)/N,N′-diphenyl-N,N′-bis[4-(phenyl-m-tolyl-amino)phenyl]-biphenyl-4,4′-diamine (DNTPD)/N,N,N′,N′-tetra(1-biphenyl)-biphenyl-4,4′-diamine (TBB)/ SBTF hosts: D3 /9,10-di(naphthalene-2-yl)anthracen-2-yl-(4,1-phenylene)(1-phenyl-1H -benzo[d]imidazole) (LG201)/LiF/Al configuration and were subsequently investigated. The H1 : 5% D3 device exhibited an electroluminescent emission at 472 nm, with efficiency 6.91 cd/A, external quantum efficiency 4.56% at 107.84 mA/cm2, and a sky-blue color at Commission Internationale de l′Eclairage (CIE) (x,y) coordinates of (0.150, 0.217) at 7447 cd/m2.
차재령,이칠원,공명선 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.5
Starburst-type hole-transporting and electron-transporting materials, tris(3-(9H-carbazol-9-yl)phenyl)amine (TmCTA ), 2,4,6-tri([1,1′-biphenyl]-3-yl)-1,3,5-triazine (1), 2,4,6-tris(3′-methyl-[1,1′-biphenyl]-3-yl)-1,3,5-triazine (2), and 2,4,6-tris(3′,5′-dimethyl-[1,1′-biphenyl]-3-yl)-1,3,5-triazine (3) having high triplet energies and excellent thermal stabilities were synthesized. Deposited films of TmCTA , with 1, 2, or 3 as hosts, were doped with the blue phosphorescent dopant bis[2-(4,6-difluorophenyl)pyridinato-C2 ,N](picolinato)iridium(III) (FIrpic) and their device characteristics were evaluated. In co-deposited films, the molecular weight ratio of TmCTA to 1, 2, or 3 was 1: 1, and these co-hosts formed exciplexes. By comparison with those of single-host systems, the PL spectra of the co-deposited films were red-shifted, suggesting that exciplexes are formed by the two constituent molecules. When doped with 10% FIrpic, TmCTA :1 device showed an external quantum efficiency (EQE) of 14.56% (maximum 16.46%) at 1000 cd/m2; similar results were obtained for the remaining films. The EQE roll-offs in the co-host systems are much smaller than those of single-host device using TmCTA .
차재령,이칠원,공명선 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.9
The novel electron-transporting moiety of 2,7-diazacarbazole was used to construct a bipolar host molecule for phosphorescent organic light-emitting diodes (PHOLEDs). This moiety was incorporated with typical hole-transporting carbazole moieties to synthesize a 2,7-diazacarbazole/carbazole hybrid called 9-(3,5-bis(carbazol-9-yl)phenyl)–2,7-diazacarbazole. The hybrid exhibits a high triplet energy above 2.88 eV and very high glass transition temperature of Tg = 148°C. It shows good thermal stability owing to the rigid nature of its symmetrical bipolar structure. The 2,7-diazacarbazole-based host material turns on at 3.6 and 3.7 V and approaches external quantum efficiencies above 16.0 and 22.6% in blue and green PHOLEDs, respectively. These results demonstrate that 2,7-diazacarbazole should be an excellent electron-transporting unit for bipolar phosphorescent hosts.
차재령,윤상우,공명선,이칠원 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
We have designed and synthesized novel 9-(2-(4,6-diphenyl-1,3,5- triazin-2-yl)phenyl)-9H-carbazole(Cz-Trz), 9,9'-((6-phenyl-1,3,5-triazine- 2,4-diyl)bis(2,1-phenylene))bis(9H-carbazole)(BCz-Trz), 2,4,6-tris(2- (9H-carbazol-9-yl)phenyl)-1,3,5-triazine(TCz-Trz) as the dopant material for themally activatied delayed fluorescence. The blue device When the device configuration of PEDOT(60 nm)/TAPC(20 nm)/mCP (10nm)/mCP:Dopant(25 nm)/TSPO1(5 nm)/TPBi(30 nm)/LiF(1nm)/Al (200 nm) was constructed, the EL emissions of the devices are observed at 470 nm (Cz-Trz), 465 nm (BCz-Trz), 467nm (TCz-Trz). In optimized structure, the best performance of TCz-Trz based blue emitting devices exhibits a current efficiency of 20.79 cd/A and external quantum efficiency of 13.38% at 1000 cd/m<sup>2</sup>.
차재령,이칠원,공명선 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
We have developed a high performance fused ring fluorescent host and dopant materials, 3-(2-naphthyl)-10-naphthylspiro[benzo[ij]tetraphene -7,9'-fluorene] (1), 1-[1-(4-biphenyl)]-10-phenylspiro[benzo[ij]tetraphene -7,9'-fluorene] (2) and 3,9-di(di(p-ditolyl))aminospiro[benzo[de]anthracene- 7,9'-fluorene] (D3), for blue organic light-emitting diodes. 1, 2 and D3 formed a stable amorphous solid state film with a high glass transition temperature 179, 168 and 148°C. The structure of the device fabricated was as follows: ITO (150 nm)/N,N’-diphenyl-N,N’-bis[4- (phenyl-m-tolyl-amino)phenyl]-biphenyl-4,4’-diamine (DNTPD, 60 nm)/ N,N,N’,N’-tetra(1-biphenyl)-biphenyl-4,4’-diamine (TBB, 30 nm)/1 or 2 host: D3 dopant (5%, 30 nm)/9,10-di(naphthalene-2-yl)anthracen-2-yl- (4,1-phenylene)(1-phenyl-1H-benzo[d]imidazole) (LG201, 20 nm)/ LiF (1 nm)/Al (200 nm). The multilayer devices fabricated using 1 and 2 as a blue host and D3 as a blue dopant materials showed higher power efficiency 6.86 cd/A at 7,753 cd/m2 and 6.67 cd/A at 5,549 cd/m2 than the conventional device using 9,10-di(2-naphthyl)anthracene (β-ADN) (4.74 cd/A at 895 cd/m2) at 7 V.