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Gunel Huseynova,Jae Hyun Lee,Akpeko Gasonoo,이현구,Yong Hyun Kim,Jonghee Lee 한국정보디스플레이학회 2022 Journal of information display Vol.23 No.4
We present the fluorinated hexaazatrinaphthylene derivative, 1,2,3,4,7,8,9,10,13,14,15,16- dodecafluoro-5,6,11,12,17,18-hexaazatrinaphthylene (HATNA-F12), as a new material to replace another hexaazatrinaphthylene molecule, 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile (HATCN), which is widely used as an intermediate connector and charge generation layer (CGL) in tandem organic light-emitting diodes (OLEDs). Upon comparison with the reference single emitting layer unit OLED, the tandem device with HATNA-F12 CGL had improved current efficiency and external quantum efficiency of 42.1% and 41.7%, respectively. Our results show that HATNA-F12 is an excellent substitute for HAT-CN and has more promising characteristics as a CGL material for applications in tandem OLEDs. When compared to devices with HAT-CN CGL, the green tandem OLEDs with CGL consisting of HATNA-F12 demonstrated improved current efficiency, power efficacy, and external quantum efficiency values, while the change of the CGL material had almost no effect on the operating voltage, current density, and color coordinates of the OLEDs. We confirm that using the newly suggested HATNA-F12 molecule as a CGL in these OLEDs can enhance device efficiency.
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Liver dose reduction by deep inspiration breath hold technique in right-sided breast irradiation
Gunel Haji,Ulviye Nabizade,Kamal Kazimov,Naile Guliyeva,Isa Isayev 대한방사선종양학회 2019 Radiation Oncology Journal Vol.37 No.4
Purpose: Deep inspiration breath hold (DIBH) is a well-established technique that enables efficient cardiac sparing in patients with left-sided breast cancer. The aim of the current study was to determine if DIBH is effective for reducing radiation exposure of of liver and other organs at risk in right breast radiotherapy (RT). Materials and Methods: Twenty patients with right-sided breast cancer were enrolled in this study. Three-dimensional conformal RT plans were generated for each patient, with two different computed tomography scans of free breathing (FB) and DIBH. Nodes were contoured according to the Radiation Therapy Oncology Group contouring guidelines. Dose-volume histograms for the target volume coverage and organs at risk were evaluated and analyzed. Results: DIBH plans showed significant reduction in mean liver dose (5.59 ± 2.07 Gy vs. 2.54 ± 1.40 Gy; p = 0.0003), V20Gy (148.38 ± 73.05 vs. 64.19 ± 51.07 mL; p = 0.0003) and V10Gy (195.34 ± 93.57 vs. 89.81 ± 57.28 mL; p = 0.0003) volumes compared with FB plans. Right lung doses were also significantly reduced in DIBH plans. Heart and left lung doses showed small but statistically significant improvement with application of the DIBH technique. Conclusion: We report that the use of DIBH for right-sided breast cancer significantly reduces the radiation doses to the liver, lungs, and heart.
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Effect of the Hole Injection Layer Conductivity on the Performance of Polymer Light-Emitting Diodes
Gunel Huseynova,Jae-Min Yoo,Baeksang Sung,Seung-Hoon Lee,Jangwon Lee,Seung Wan Woo,Yong Hyun Kim,Jae-Hyun Lee,Jonghee Lee 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.4
In this study, a doped polymer hole injection layer (HIL) consisting of (3,4-ethylenedioxythiophene):poly(styrenesulfonate)PEDOT:PSS (AI4083), was employed to enhance the performance of organic light-emitting diodes (OLEDs) based on a solutionprocessedpolymer emissive layer. Highly conductive PEDOT:PSS (AI4083) was achieved using an organic small molecule,methyl red as a solution-processed dopant. The electrical conductivity of the polymer fi lms was enhanced by more than an orderof magnitude after doping compared to the pristine fi lms. The fabricated polymer OLEDs (PLEDs) with the doped PEDOT:PSS(AI4083) HILs displayed yellow emission at 550 nm with increased current and external quantum effi ciencies as well as twicethe luminance of the PLED with an undoped HIL. In addition, the turn-on voltage reduced from 3.8 to 3.5 V in the devices withthe doped HILs. This improved light-emitting characteristics originate from the increased conductivity of PEDOT:PSS (AI4083)that boosted its hole injection properties. Thus, our results show that the performance of PLEDs can be signifi cantly enhancedby simple modifi cation of the conductivity of polymer HILs using low-cost and solution-processed organic dopant molecules.
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Gunel Huseynova,Jonghee Lee,Jae-Hyun Lee,Won Mok Kim,Yong Hyun Kim 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.6
A highly transparent nanostructured light outcoupling system integrated with a solution-processed polymer anode is proposedfor enhancing the light outcoupling of tandem white organic light-emitting diodes (OLEDs). A poly(3,4-ethylenedioxythiophene)/polystyrene sulfonate (PEDOT:PSS) anode with an internal outcoupling structure (IOS) was easily prepared on aglass substrate via rapid and cost-eff ective fabrication methods. The nanostructures for the IOS were constructed based onzinc tin oxide (ZTO) prepared by Zn and Sn sputtering followed by thermal annealing. The refractive index matching andinternal light scattering led to remarkably reduced waveguided and substrate modes in the OLEDs. The external quantumeffi ciency (EQE), current effi ciency (CE), and luminance effi ciency (LE) of the tandem white OLEDs fabricated using thePEDOT:PSS/IOS system were superior to those of the devices based on the conventional ITO and PEDOT:PSS electrodeswithout the IOS. With the application of the ZTO-based IOS, the tandem devices achieved EQE, CE, and LE 20.6%,42 cd/A, and 23.3 lm/W, respectively, showing a 1.4-fold EQE enhancement over that of the ITO-based device without theIOS. Moreover, the EQE of the devices increased by a factor of 2.3 upon combining the ZTO IOS with a hemispherical lensplaced on the backside of the substrate. Remarkably, the ZTO IOS-based devices exhibited outstanding white color stabilityover large viewing angles. The simple and low-cost IOS developed in this study can potentially be a practical technique forenhancing the light outcoupling effi ciency of tandem white OLEDs.
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Huseynova Gunel,Boampong Amos Amoako,Yu Kyeong Min,Lee Ye-Seul,Lee Jonghee,Kim Min-Hoi,Lee Jae-Hyun 한국정보디스플레이학회 2023 Journal of information display Vol.24 No.1
We present an n-doped poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) polymer and its application in n-type oxide thin-film transistors (OxTFTs) as a source and drain electrode material. A reduced molecule of a cationic dye, methyl red (MR), was used as an effective solution-processed n-type dopant. The sequential de-doping and doping of the initially p-doped PEDOT:PSS polymer with the reduced MR (r-MR) effectively removed positive charges via cancellation by the added electrons. As a result, the electron conductivity of PEDOT:PSS increased from 3.4 S/cm to ∼51 S/cm, while its work function decreased from 4.8 eV to 3.5 eV. This is one of the lowest values of the work function reported for PEDOT:PSS. The n-doped PEDOT:PSS films were eventually applied as a suitable material to fabricate the contact electrodes of solution-processed bottom-gate top-contact amorphous indium-gallium-zinc oxide-based OxTFTs. The resultant devices exhibited electron mobility over ten times better compared to those with undoped PEDOT:PSS electrodes. Therefore, we suggest this method as a highly suitable and low-cost technique for improving electron transport in PEDOT:PSS and all solution-processed conductors. Further investigations with this method are expected to expand the application of PEDOT:PSS to other sectors of optoelectronics.
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Huseynova Gunel,김용현,이재현,이종희 한국정보디스플레이학회 2020 Journal of information display Vol.21 No.2
An organic conductive polymer, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), is an attractive candidate for a low-cost, low-temperature, and solution-processed electrode material for achieving high-performance flexible and stretchable thin-film devices. Unlike most organic materials, this water-soluble conjugated polymer is highly stable against chemical and physical exposure. It exhibits the most superior mechanical flexibility and the highest optical transparency and electrical conductivity among all organic conductors. Therefore, this conductive polymer is among the most promising alternatives to the expensive, rigid, and brittle metal oxide- and even metal-based electrode materials, such as indium tin oxide (ITO) and gold, in the future solution-processed electronic devices. Nevertheless, the intrinsic conductivity of PEDOT:PSS is typically below 1 S cm−1, which is too low for such devices. Fortunately, the material properties of PEDOT:PSS, including its conductivity, are easily tuned by employing a large number of simple approaches. In this paper, the reports on the successful application of PEDOT:PSS to a wide range of solution-processed organic devices, such as organic light-emitting diodes (OLEDs), organic thin-film transistors (OTFTs), and organic photovoltaics (OPVs), are reviewed. The recent progress in the development of highly conductive PEDOT:PSS-based films for electrode applications in the field of organic electronics is the main focus of the discussion herein.
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Liver dose reduction by deep inspiration breath hold technique in right-sided breast irradiation
Haji, Gunel,Nabizade, Ulviye,Kazimov, Kamal,Guliyeva, Naile,Isayev, Isa The Korean Society for Radiation Oncology 2019 Radiation Oncology Journal Vol.37 No.4
Purpose: Deep inspiration breath hold (DIBH) is a well-established technique that enables efficient cardiac sparing in patients with left-sided breast cancer. The aim of the current study was to determine if DIBH is effective for reducing radiation exposure of of liver and other organs at risk in right breast radiotherapy (RT). Materials and Methods: Twenty patients with right-sided breast cancer were enrolled in this study. Three-dimensional conformal RT plans were generated for each patient, with two different computed tomography scans of free breathing (FB) and DIBH. Nodes were contoured according to the Radiation Therapy Oncology Group contouring guidelines. Dose-volume histograms for the target volume coverage and organs at risk were evaluated and analyzed. Results: DIBH plans showed significant reduction in mean liver dose (5.59 ± 2.07 Gy vs. 2.54 ± 1.40 Gy; p = 0.0003), V<sub>20Gy</sub> (148.38 ± 73.05 vs. 64.19 ± 51.07 mL; p = 0.0003) and V<sub>10Gy</sub> (195.34 ± 93.57 vs. 89.81 ± 57.28 mL; p = 0.0003) volumes compared with FB plans. Right lung doses were also significantly reduced in DIBH plans. Heart and left lung doses showed small but statistically significant improvement with application of the DIBH technique. Conclusion: We report that the use of DIBH for right-sided breast cancer significantly reduces the radiation doses to the liver, lungs, and heart.
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Huseynova, Gunel,Shin, Eul-Yong,Park, Won-Tae,Noh, Yong-Young Elsevier 2019 Dyes and pigments Vol.162 No.-
<P><B>Abstract</B></P> <P>We report lithium benzoate (LB) as an effective electron dopant for commonly used diketopyrrolopyrrole (DDP) based electron donor-acceptor conjugated polymers and its application in organic thin-film transistors (OTFTs). Three DPP derivative classes were considered: ambipolar, electron dominant, and hole dominant semiconducting polymers. Applying LB dopant at the contact or semiconducting layer bulk significantly improved overall n-channel performance more than 100-fold, such as electron mobility and on/off current ratio for solution-processed DPP based OTFTs compared with pristine devices. The best DPP based OTFTs with LB achieved high electron mobility (0.6 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>) with excellent operational stability. In particular, complete ambipolar transport modulation to unipolar n-type was achieved for n-channel dominant OTFTs devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Lithium benzoate (LB) is introduced as an n-channel dopant for conjugated polymers. </LI> <LI> Electron mobility and on/off ratio of OTFTs is significantly improved more than 100 times. </LI> <LI> Polarity of the devices is effectively tuned from ambipolar to unipolar n-type by LB doping. </LI> <LI> Remarkably enhanced n-channel operational stability is achieved. </LI> </UL> </P>
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Location-Allocation of earthquake shelters by applying Multi Criteria Decision Method : Review
Huseynova Gunel 서울대학교 국토문제연구소 2019 地理學論叢 Vol.65 No.-
Earthquake is one of the most devastating disasters in the world and one negative result of this disaster is that it leads to a large scale of homelessness in many countries. Therefore, determining the location of earthquake shelters and allocating affected population to them with more developed optimizing methods is key issue for disaster planners. Considering this fact, the objective of this study is to analyze methods used for determination of shelter locations in different countries by doing systematic review based on academic articles findings and then assessing the result. This research is composed of three parts, which are: suitability analysis by utilizing MCDM; weighting criteria model, AHP; and location allocation models. First, according to the published articles review, we generated a list that indicates the most important criteria for selection of most preferable sites for earthquake shelters. In the next stage, the weighting of criteria method (AHP) has been reviewed since this is the most important stage of the planning. In the last stage, location allocation models reviewed for satisfying demand points. As the result of the first part, according to academic articles which utilized MCDM, 16 most important criteria within 3 categories for locating shelters selected. The result of second part, clarified the usage of AHP; and cons and pros of the method discussed. The result of third part, evaluated different kind of location allocation methods which used in research. In conclusion, this study is important for emergency planners to select the most suitable locations for earthquake disaster sheltering and solve the location allocation with minimum confusion.
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