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( Saripally Sudhaker Reddy ),조우섬,진성호 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The two new compounds S1 and S2, with N-atom as linker containing phenylcarbazole and fluorenyl group as main core and SBF and SBFN end cappers were designed and synthesized for blue fluorescent organic light emitting diodes (FOLEDs). The introduction of SBF has render to achieve high thermal stability and this could suppress the intermolecular interactions. Their photophysical, thermal and electrochemical properties of the material were systematically investigated by UV-visible absorption, photoluminescence (PL), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and cyclic voltammetry (CV). The two compounds display blue emission in solution and solid state. Especially, S1 exhibit deep blue emission (441 nm) with an excellent color purity (y≤ 0.10). Solution-processed devices based on these materials exhibit high efficient and stable deep blue electro luminescence. The blue Fluorescent OLEDs were fabricated with the configuration of ITO/PEDOT:PSS/emitter/TPBI/LiF/Al. The optimized fluorescent OLEDs showed impressive device performance with maximum luminance efficiency of 3.0 cd/A, maximum power efficiency of 1.5 lm/W and maximum external quantum efficiency of 2.0% with CIE coordinate of (0.14, 0.19) at 3.1 V driving voltage.
A New Benzodithiophene Based Donor-Acceptor π-Conjugated Polymer for Organic Solar Cells
Saripally Sudhaker Reddy,Um Kanta Aryal,진현정,Thavamani Gokulnath,Durga Gayathri Rajalapati,Kakaraparthi Kranthiraja,신성태,진성호 한국고분자학회 2020 Macromolecular Research Vol.28 No.2
A new benzodithiophene based donor-acceptor π-conjugated polymer (P1) is designed and explored as the photoactive donor for organic solar cells (OSCs). The synthesized donor polymer, P1 displays a wide absorption profile ranging from 300-750 nm with optical band gap of 1.61 eV and moderate ionization potential of -5.30 eV. It has good solubility in non-halogenated and halogenated organic solvents. Next, we fabricated OSCs with P1 by blending with PC71BM, the pristine polymer processed from chlorobenzene showed PCE of 2.79%. Upon addition of external additive diphenyl ether to the blend showed a dramatic improvement in PCE with maximum of 5.33%. DPE tailored the active layer morphology and showed two times higher PCE than pristine films. These results clearly indicate that the new polymer has a great potentiality for enhancing efficiency upon solvent additives, which will provide new routes for the development of new class of polymers for high-performance air-stable OSCs.
Reddy, Saripally Sudhaker,Sree, Vijaya Gopalan,Park, Ho-Yeol,Maheshwaran, Athithan,Song, Myungkwan,Jin, Sung-Ho Elsevier 2017 Dyes and pigments Vol.145 No.-
<P><B>Abstract</B></P> <P>A rational design strategy is proposed for synthesis of a new deep-blue emitter/dopant (denoted as TPA-3FA) based on triphenylamine (TPA) as the core with the addition of diethylfluorene/acridine analogues to frame a star-shaped material for solution processable high performance OLEDs. The photophysical, thermal, electrochemical, electronic, and hole transporting properties of TPA-3FA are examined. Most importantly, this rational design strategy of introducing diethylfluorene between TPA and acridine imparts high rigidity and non-planarity, which in turn completely suppress intermolecular interactions, and thus yields a strong narrow deep-blue fluorescence with a high quantum yield. Moreover, a solution processed non-doped device with TPA-3FA as an emitter exhibits excellent device performance with a maximum external quantum efficiency (EQE) of 4.43%, CIE (<I>x</I>,<I>y</I>) coordinates of (0.153, 0.045) and good device stability. The device performance was significantly improved with an EQE of 6.11% and CIE (<I>x</I>,<I>y</I>) coordinates of (0.156, 0.049) after doping into a host. The same device when processed in a halogen-free solvent exhibited an impressive EL performance (EQE: 5.72%; CIE (0.157, 0.046)).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Rationally designed and synthesized an efficient deep-blue fluorescent emitter for solution processed OLEDs. </LI> <LI> A nondoped device exhibits an excellent device performance with an EQE of 4.43% and CIE (<I>x</I>,<I>y</I>) value of (0.153,0.045). </LI> <LI> Doped device performance is dramatically improved EQE of 6.11%; CIE (<I>x</I>,<I>y</I>):(0.156, 0.049). </LI> <LI> In a halogen-free solvent-processed device is also showed EQE of over 5.7% with a small CIE <I>y</I> value. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Saripally Sudhaker Reddy ),( Sree Vijaya Gopalan ),진성호 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Here, we report the synthesis of two new deep-blue fluorescent emitters, namely AFpTPI and AFmTPI based on AF as a core and TPI derivatives with different linking modes for nondoped solution-processable OLEDs. Their thermal, photophysical, electrochemical, electronic distribution and device characteristics were systematically investigated and are supported by theoretical calculations. Both of them have excellent thermal stability (~450 °C) with high glass transition temperatures (141-152 °C). AFpTPI and AFmTPI show deep-blue emission in solution with high fluorescence quantum yields. In particular, solution-processed nondoped device with AFpTPI as an emitter achieved a maximum EQE of 4.56% with CIE coordinates (0.15, 0.06) and a CE of 2.39 cd A(-1), which is exactly matching with EBU blue standard. To the best of our knowledge, this is the first report on nondoped solution-processable OLEDs with efficiency close to 5% and CIE y ≤ 0.06.
Cho, Woosum,Reddy, Saripally Sudhaker,Kim, Junyoung,Cho, Young-Rae,Jin, Sung-Ho The Royal Society of Chemistry 2018 Journal of Materials Chemistry C Vol.6 No.43
<P>A novel cross-linkable red iridium(iii) complex and electron transport material were designed and synthesized for use in the fabrication of solution-processed phosphorescent organic light-emitting diodes (PHOLEDs). The newly cross-linkable red Ir(iii) complex was successfully thermal cross-linked with a cross-linkable host in the emitting layer (EML). After cross-linking, the EML was found not to be damaged by organic solvents. A maximum external quantum efficiency (EQE) of 4.64% (2.77 cd A<SUP>−1</SUP>) was achieved for deep-red PHOLEDs after rinsing, which was similar to the EQE of 4.59% (2.52 cd A<SUP>−1</SUP>) after rinsing the deep-red PHOLEDs with thermal cross-linking.</P>
Veera Murugan Arivunithi,박호열,Saripally Sudhaker Reddy,도영주,박형진,신은솔,노용영,송명관,진성호 한국고분자학회 2021 Macromolecular Research Vol.29 No.2
Although perovskite solar cells (PSCs) have achieved high power conversion efficiency (PCE) by utilizing 2,2',7,7'-tetrakis(N,N'-di-p-methoxyphenylamine)- 9,9'-Spirobifluorene (Spiro-OMeTAD) as hole transporting material (HTM), the reproducibility and stability of PSCs are still a pressing concern. Herein, we introduced a solvent processed organic-organic bilayer based on 2-(4-(7-(9,9-dimethylacridin-10(9H)- yl)-9,9-diethyl-9H-fluoren-2-yl)phenyl)-1-phenyl-1H-phenanthro[9,10-d]imidazole (AFpPPI) and Spiro-OMeTAD in layer to layer as HTM in PSCs. The devices configured with AFpPPI/Spiro-OMeTAD bilayer achieved a maximum PCE of 19.9% in mesoporous-TiO2 (mp-TiO2) structure with perovskite absorber of Cs0.05Rb0.05(FAPbI3)0.76 (MAPbBr3)0.14. The properties of the bilayer structure were analyzed with steadystate photoluminescence, ultra-violet photoelectron and impedance spectroscopy. The AFpPPI/Spiro-OMeTAD improved open-circuit voltage (VOC) by lowering the quasi-Fermi energy level for holes and reducing the charge recombination, resulting in high VOC (1.14 V in the champion cell) and high fill factor (FF) that lead to high PCE. The addition of AFpPPI layer improves the quality of Spiro-OMeTAD and provides pinhole-free film. Moreover, the stability is improved in controlled temperature and humid conditions. This work affords a new approach for commercial applications of PSCs with better stability.
Um Kanta Aryal,Saripally Sudhaker Reddy,최정민,우채영,장석훈,이윤구,김봉수,이형우,진성호 한국고분자학회 2020 Macromolecular Research Vol.28 No.8
Cathode interfacial layers (CIL) have been applied in organic solar cells (OSCs) for the enhancement of photovoltaic characteristics. Most of them are employed in either conventional organic solar cells (COSCs) or inverted organic solar cells (IOSCs) only. Herein, we have designed and synthesized two cathode interfacial materials, namely, 3-(4,6-bis(4-bromophenoxy)-1,3,5-triazin-2-yl)-2,6-difluorophenyl)diphenylphosphine oxide (Br-PO-TAZ) and 4,4'-((6-(3-(diphenylphosphoryl)-2,4-difluorophenyl)- 1,3,5-triazine-2,4-diyl)bis(oxy))dibenzonitrile (CN-PO-TAZ), and utilized them as CILs for both COSCs and IOSCs. The incorporation of our new CIL layers significantly enhanced the photovoltaic performance compared to COSCs and IOSCs without the CILs. The CN-PO-TAZ exhibited a power conversion efficiency (PCE) of 8.19% for COSCs and 8.33% for IOSCs, whereas Br-PO-TAZ yielded a PCE of 8.15% for COSCs and 8.23% for IOSCs, respectively. The improved performance was attributed to the multiple favorable factors: significantly reducing leakage current, decreasing series resistance, suppressing recombination, efficient charge transport and collection. Moreover, the CIL layers helped for sustaining device stability because they served as an internal shield against humidity.
Efficient dual cathode interfacial layer for high performance organic and perovskite solar cells
Aryal, Um Kanta,Arivunithi, Veera Murugan,Reddy, Saripally Sudhaker,Kim, Junyoung,Gal, Yeong-Soon,Jin, Sung-Ho Elsevier 2018 ORGANIC ELECTRONICS Vol.63 No.-
<P><B>Abstract</B></P> <P>Cathode interfacial layer (CIL), phenylquinoline-based, 10-ethyl-3,7-bis(4-phenylquinolin-2-yl)-10<I>H</I>-phenothiazine (PTDPQ) was employed between the ZnO and photoactive layer, poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-<I>b</I>]-thiophenediyl] (PTB7):[6,6]-phenyl C<SUB>71</SUB>-butyric acid methyl ester (PC<SUB>71</SUB>BM) for the inverted organic solar cells (IOSCs) and between LiF and PTB7:PC<SUB>71</SUB>BM for conventional organic solar cells (COSCs). It was also incorporated as interfacial layer in perovskite solar cells (PSCs). For the ZnO/PTDPQ bilayer, the power conversion efficiency (PCE) enhanced to 8.69%, which is about 15% improvement than that of the control IOSCs reference device. For the PTDPQ/LiF bilayer, it was achieved to 8.06%, and after insertion of PTDPQ as interfacial layer for PSCs, average PCE enhanced to 16.45% from that of 15.28% reference device. Hereinafter, PTDPQ as CIL enhances the solar cells device performance. It is analyzed that the charge recombination is suppressed and facilitates charge extraction due to the incorporation of the dual CIL as accordance with observed improvement of the solar cell parameters. The devices with dual CIL showed the higher electron mobility which matches with the higher fill factor and improved current density. The dual CIL exhibited excellent impact on enhancing the photovoltaic properties of OSCs and PSCs along with long-term stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The phenylquinoline based, PTDPQ is used as dual CIL for organic and perovskite solar cell application. </LI> <LI> Dual CIL played a great role in the improvement of overall photovoltaic performances. </LI> <LI> The solar cell devices with PTDPQ significantly enhanced both OSCs and PSCs performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>