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Öğe 2, 7-dibromospirofluoren monomerlerinin sentezi, karakterizasyonu ve fotofiziksel özelliklerinin tespitedilmesi(Ege Üniversitesi, 2009) Bilgili, Hakan; Demiç, ŞerafettinBu tezde, 5 adet spirofluoren monomerinin [2,7-dibromospiro(siklododekan-1,9'-fluoren), 2,7-dibromospiro(siklohekzan-1,9'-fluoren), 2,7-dibromospirobifluoren, 2,7-dibromo-4,5-diazaspiro-bifluoren ve 2,7-dibromo-4,5-diazaspirobifluoren ve 2,7-bis(4,4,5,5-tetrametil-1,3,2-dioksoborolan-2-il)-9,9'-dioktilfluoren] sentezi ve spekt-roskopik karakterizasyonlarını içeren sonuçlara yer verilmiştir.Sentezlenen monomerlerin moleküler yapıları 1H, 13C NMR ve FTIR spektroskopisi ile aydınlatılmıştır. Fotofiziksel ve termal özellikleri, sırasıyla, UV-Vis ile fluoresans spektroskopisi ve TGA ile tayin edilmiştir. Bu monomerlerin polimerleştirilmesinden elde edilecek olan kopolifluoren türevlerinin özellikle ışık yayan organik diyotlarda (OLED) ve diğer fotoelektronik ve optoelektronik alanlarında kullanılmaları mümkündürÖğe 2,7-Dibromospirofluoren monomerlerinin sentezi, karakterizasyonu ve fotofiziksel özelliklerinin tespit edilmesi(Ege Üniversitesi, 2009) Bilgili, Hakan; Demiç, Şerafetinu tezde, 5 adet spirofluoren monomerinin [2,7-dibromospiro(siklododekan-1,9’-fluoren), 2,7-dibromospiro(siklohekzan-1,9’-fluoren), 2,7-dibromospirobifluoren, 2,7-dibromo-4,5-diazaspiro-bifluoren ve 2,7-dibromo-4,5-diazaspirobifluoren ve 2,7-bis(4,4,5,5-tetrametil-1,3,2-dioksoborolan-2-il)-9,9’-dioktilfluoren] sentezi ve spekt-roskopik karakterizasyonlarını içeren sonuçlara yer verilmiştir. Sentezlenen monomerlerin moleküler yapıları 1H, 13C NMR ve FTIR spektroskopisi ile aydınlatılmıştır. Fotofiziksel ve termal özellikleri, sırasıyla, UV-Vis ile fluoresans spektroskopisi ve TGA ile tayin edilmiştir. Bu monomerlerin polimerleştirilmesinden elde edilecek olan kopolifluoren türevlerinin özellikle ışık yayan organik diyotlarda (OLED) ve diğer fotoelektronik ve optoelektronik alanlarında kullanılmaları mümkündür.Öğe 2,7-dipromospirofluoren monomerlerinin sentezi, karakterizasyonu ve fotofiziksel özelliklerinin tespit edilmesi(Ege Üniversitesi, 2010) Bilgili, Hakan; Demiç, ŞerafettinBu tezde, kopolifluoren türevlerinin sentezinde kullanılmaya uygun 4 adet spirofluoren monomerleri [2,7-dibromospiro(siklododekan-1,9'-fluoren), 2,7- dibromospiro(siklohekzan-1,9'-fluoren), 2,7-dibromospirobifluoren, 2,7-dibromo-4,5- diazaspirobifluoren ve 2,7-dibromo-4,5-diazaspirobifluoren] sentezlenmistir. Monomerlerin ve ara ürünlerin, sentezleri ayrıntılı olarak gösterilmis, moleküler yapıları 1H ve 13C NMR spektroskopisi kullanılarak aydınlatılmıstır. Sentezlenen türevlerin uygun yöntemler kullanılarak polimerlestirilmesinden elde edilecek olan kopolifluoren türevlerinin özellikle ısık yayan organik diyotlarda (OLED) ve diger fotoelektronik ve optoelektronik alanlarında kullanılmaları mümkündür.;s-conjugated polymer, copolyfluorene, spiroalkylfluorene, organic light emitting diyots.;s-konjuge polimer, kopolifluoren, ısık yayan organik diyot, spiroalkilfluoren.Öğe Çok fonksiyonlu materyaller:(Ege Üniversitesi, 2013) Bilgili, Hakan; Demiç, ŞerafettinBu doktora tezi kapsamında hacimsel heteroeklem organik güneş hücresi üretiminde kullanılan 6 tane donör-akseptör tipi iletken polimer sentezi gerçekleştirilmiştir ve güneş hücresi uygulamaları yapılmıştır. Sentezlenen donör-akseptör polimer yapılardan 5 tanesi orijinal olup, bir tanesi literatürde bilinmekte ve kullanılmaktadır. sıkça kullanılan polimer yapıdır. Yapılarda üç farklı tip donör ile 2 farklı tip akseptör birim kullanılmıştır. Sentezlenen polimerler hacimsel heteroeklem organik güneş hücresi üretiminde aktif tabakada donör polimerik yapı olarak kullanılan P3HT'ye alternatif olarak tasarlanmıştır. Sentezlenen polimerin yapısal karakterizasyonları 1H NMR spektroskopisi, optik ve elektrokimyasal özellikleri ise UV-Vis absorbsiyon spektroskopisi, fluoresans spektroskopisi ve döngüsel voltammetri (CV) teknikleri kullanılarak yapılmıştır. Sentezlenen polimer yapıların isimleri; 3,6-di-tert-butil-9-{4-[2-{3'-hekzil-5'-[7-(3-hekzil-5-metil-2-tiyenil)-2,1,3-benzotiyadiazol-4-il]-2,2'-bitiyen-5-il}-5-(5'-metil-2,2'-bitiyen-5-il)-1H-pirol-1-il]fenil}-9H-karbazol (SNS-TBT), 3,6-di-tert-butil-9-{4-[2-{3'-hekzil-5'-[7-(3-hekzil-5-metil-2-tiyenil)-2,1,3-benzoselenidiazol-4-il]-2,2'-bitiyen-5-il}-5-(5'-metil-2,2'-bitiyen-5-il)-1H-pirol-1-il]fenil}-9H-carbazole (SNS-TBSeT), 4-[5-(9,9-dioktil-7-fenil-9H-fluoren-2-il)-4-hekil-2-tiyenil]-7-(4-hekzil-5-fenil-2-tiyenil)- 2,1,3-benzotiyadiazol (F8-TBT), 4-[5-(9,9-dioktil-7-fenil-9H-fluoren-2-il)-4-hekzil-2-tiyenil]-7-(4-hekzil-5-fenil-2-tiyenil)- 2,1,3-benzoselenidiazol (F8-TBSeT), 4-[4-hekzil-5-(7'-fenilspiro[siklododekan-1,9'-fluoren]-2'-il)-2-tiyenil]-7-(4-hekzil-5-fenil-2-tiyenil)-2,1,3-benzotiyadiazol (SF12-TBT), 4-[4-hekzil-5-(7'-fenilspiro[siklododekan-1,9'-fluoren]-2'-il)-2-tiyenil]-7-(4-hekzil-5-fenil-2-tiyenil)-2,1,3-benzotiyadiazol (SF12-TBSeT) Sentezlenen donör-akseptör yapılar hacimsel heteroeklem güneş hücresinde donör bileşen olarak kullanılmıştır. Üretilen hücre yapıları ITO/PEDOT:PSS/POLİMER-PC71BM/LiF/Al dizini şeklinde hazırlanmıştır. Hücrelerin standart ölçüm şartlarında akım-gerilim (I-V) eğrileri kullanılarak ve gelen ışığın akıma dönüşüm verim (IPCE)`leri belirlenerek fotovoltaik parametreleri belirlenmiştir. Sonuç olarak en yüksek verimi SF12-TBT (% 3,76), en düşük verimi ise SNS-TBT (% 0,082) bileşiklerinin verdiği belirlenmiştir.Öğe Çok fonksiyonlu materyaller:(Ege Üniversitesi, 2014) Bilgili, Hakan; Demiç, ŞerafettinBu projede hacimsel heteroeklem organik güneş hücresi üretiminde kullanılan 6 tane donör-akseptör tipi iletken polimer sentezi gerçekleştirilmiştir ve güneş hücresi uygulamaları yapılmıştır. Sentezlenen donör-akseptör polimer yapılardan 5 tanesi orijinal olup, bir tanesi literatürde bilinmekte ve kullanılmaktadır. sıkça kullanılan polimer yapıdır. Yapılarda üç farklı tip donör ile 2 farklı tip akseptör birim kullanılmıştır. Sentezlenen polimerler hacimsel heteroeklem organik güneş hücresi üretiminde aktif tabakada donör polimerik yapı olarak kullanılan P3HT - ye alternatif olarak tasarlanmıştır. Sentezlenen polimerin yapısal karakterizasyonları 1H NMR spektroskopisi, optik ve elektrokimyasal özellikleri ise UV-Vis absorbsiyon spektroskopisi, fluoresans spektroskopisi ve döngüsel voltammetri (CV) teknikleri kullanılarak yapılmıştır. Sentezlenen polimer yapıların isimleri; 3,6-di-tert-butil-9-{4-[2-{3'-hekzil-5'-[7-(3-hekzil-5-metil-2-tiyenil)-2,1,3-benzotiyadiazol-4-il]-2,2'-bitiyen-5-il}-5-(5'-metil-2,2'-bitiyen-5-il)-1H-pirol-1-il]fenil}-9H-karbazol (SNS-TBT), 3,6-di-tert-butil-9-{4-[2-{3'-hekzil-5'-[7-(3-hekzil-5-metil-2-tiyenil)-2,1,3-benzoselenidiazol-4-il]-2,2'-bitiyen-5-il}-5-(5'-metil-2,2'-bitiyen-5-il)-1H-pirol-1-il]fenil}-9H-carbazole (SNS-TBSeT), 4-[5-(9,9-dioktil-7-fenil-9H-fluoren-2-il)-4-hekil-2-tiyenil]-7-(4-hekzil-5-fenil-2-tiyenil)- 2,1,3-benzotiyadiazol (F8-TBT), 4-[5-(9,9-dioktil-7-fenil-9H-fluoren-2-il)-4-hekzil-2-tiyenil]-7-(4-hekzil-5-fenil-2-tiyenil)- 2,1,3-benzoselenidiazol (F8-TBSeT), 4-[4-hekzil-5-(7'-fenilspiro[siklododekan-1,9'-fluoren]-2'-il)-2-tiyenil]-7-(4-hekzil-5-fenil-2-tiyenil)-2,1,3-benzotiyadiazol (SF12-TBT), 4-[4-hekzil-5-(7'-fenilspiro[siklododekan-1,9'-fluoren]-2'-il)-2-tiyenil]-7-(4-hekzil-5-fenil-2-tiyenil)-2,1,3-benzotiyadiazol (SF12-TBSeT) Sentezlenen donör-akseptör yapılar hacimsel heteroeklem güneş hücresinde donör bileşen olarak kullanılmıştır. Üretilen hücre yapıları ITO/PEDOT:PSS/POLİMER-PC71BM/LiF/Al dizini şeklinde hazırlanmıştır. Hücrelerin standart ölçüm şartlarında akım-gerilim (I-V) eğrileri kullanılarak ve gelen ışığın akıma dönüşüm verim (IPCE)`leri belirlenerek fotovoltaik parametreleri belirlenmiştir. Sonuç olarak en yüksek verimi SF12-TBT (% 3,76), en düşük verimi ise SNS-TBT (% 0,082) bileşiklerinin verdiği belirlenmiştir.;Conducting polymer, Bulk heterojunction solar cell, cyclic voltammetry, donor-acceptor type polymers.;İletken polimer, hacimsel heteroeklem organik güneş hücresi, PEDOT:PSS, ITO, döngüsel voltammetri, donör-akseptör.Öğe Effect of a pi-bridging unit in triphenylamine-benzothiadiazole based donor acceptor chromophores for dye-sensitized solar cells(Pergamon-Elsevier Science Ltd, 2014) Yigit, Mesude Zeliha; Bilgili, Hakan; Sefer, Emre; Demic, Serafettin; Zafer, Ceylan; Can, Mustafa; Koyuncu, SermetTwo new metal free sensitizers based on triphenylamine-benzothiadiazole were synthesized and used in dye sensitized solar cells (DSSCs). Electrochemical and optical properties of the dyes were studied by cyclic voltammetry, UV-vis absorption and fluorescence spectroscopy. A red shift was observed by the attachment of a thiophene (MZ-259) instead of a phenylene (MZ-255) bridge. The reverse effect was observed in the electrochemical properties because of the more electron-donating thiophene incorporated into the cyanoacrylic acid as an anchoring-acceptor unit in this system resulted in a higher LUMO level. The charge distribution of the dyes was also proved by DFT calculations using the Spartan10 program with the parameters of B3LYP and 6-31G** basis set. Finally the photovoltaic performances were investigated under standard AM 1.5 illumination with a power of 100 mW/cm(2) using an ionic liquid based electrolyte. The power conversion efficiencies, eta, were increased from 3.16% to 3.81% by using thiophene instead of phenylene as a pi-bridge unit. (C) 2014 Elsevier Ltd. All rights reserved.Öğe Electrochemical and optical properties of biphenyl bridged-dicarbazole oligomer films: Electropolymerization and electrochromism(Pergamon-Elsevier Science Ltd, 2009) Koyuncu, Sermet; Gultekin, Burak; Zafer, Ceylan; Bilgili, Hakan; Can, Mustafa; Demic, Serafettin; Kaya, Ismet; Icli, Siddik4,4'-Di(N-carbazoyl)biphenyl monomer (CBP) was synthesized and coated onto ITO-glass surface by electrochemical oxidative polymerization. Its CV shows two distinct one-electron and stepwise oxidation processes occurred at 1.29 and 1.61 V. By using this property, the monomer was electrochemically polymerized separately at these oxidation states and thus, two different oligomer films were obtained afterwards. Their spectro-electrochemical and electrochromic properties were also investigated. Switching ability of the oligomers was evaluated by kinetic studies upon measuring the percent transmittance (%T) at their maximum contrast point, indicating that these oligomers were found to be suitable material for electrochromic devices. (C) 2009 Elsevier Ltd. All rights reserved.Öğe Electrochemical and optical properties of biphenyl bridged-dicarbazole oligomer films: Electropolymerization and electrochromism(Pergamon-Elsevier Science Ltd, 2009) Koyuncu, Sermet; Gultekin, Burak; Zafer, Ceylan; Bilgili, Hakan; Can, Mustafa; Demic, Serafettin; Kaya, Ismet; Icli, Siddik4,4'-Di(N-carbazoyl)biphenyl monomer (CBP) was synthesized and coated onto ITO-glass surface by electrochemical oxidative polymerization. Its CV shows two distinct one-electron and stepwise oxidation processes occurred at 1.29 and 1.61 V. By using this property, the monomer was electrochemically polymerized separately at these oxidation states and thus, two different oligomer films were obtained afterwards. Their spectro-electrochemical and electrochromic properties were also investigated. Switching ability of the oligomers was evaluated by kinetic studies upon measuring the percent transmittance (%T) at their maximum contrast point, indicating that these oligomers were found to be suitable material for electrochromic devices. (C) 2009 Elsevier Ltd. All rights reserved.Öğe ITO yüzeyinin SAM tekniği ile modifikasyonu:(Ege Üniversitesi, 2014) Havare, Ali Kemal; Bilgili, Hakan; Can, Mustafa; Demiç, Şerafettin[Abstract Not Available]Öğe A narrow range multielectrochromism from 2,5-di-(2-thienyl)-1H-pyrrole polymer bearing pendant perylenediimide moiety(Elsevier Sci Ltd, 2015) Sefer, Emre; Bilgili, Hakan; Gultekin, Burak; Tonga, Murat; Koyuncu, SermetA new 2,5-di-(2-thienyl)-1H-pyrrole (SNS) moiety containing perylenediimide (PDI) acceptor as pendant side chain has been synthesized for an electroactive monomer and then directly deposited onto ITO/glass surface via electrochemical polymerization process. The observed electronic interaction only at the excited state due to the presence of phenylene spacer between SNS-donor and PDI-acceptor moiety leads to efficient fluorescence quenching. This charge separation behavior was also proved by theoretical DFT calculations. Thin films of the polymer electropolymerized onto transparent electrode exhibited ambipolar multi-electrochromic behavior including purple, violet-red-khaki-blue colors in both anodic and cathodic regime only between -1.2 and 1.0 V. We further demonstrated that this polymer film has a high contrast ratio (Delta T = 45% at 900 nm), a faster response (0.5 s), high coloration efficiency (254 cm(2) C-1) and retained its performance by 92% even after 5000 cycles. (C) 2014 Elsevier Ltd. All rights reserved.Öğe A new processable donor-acceptor polymer displaying neutral state yellow electrochromism(Elsevier Sci Ltd, 2013) Oguzhan, Eda; Bilgili, Hakan; Koyuncu, Fatma Baycan; Ozdemir, Eyup; Koyuncu, SermetWe report here the synthesis of a new solution processable neutral state yellow polymeric electrochromic material containing 2,5-bis-dithienyl-1H-pyrrole (SNS)-donor and 1,8 naphthalimide-acceptor (SNS-NI) as a subunit. The electrochemical and optical properties were investigated via cyclic voltammetry (CV), UV Vis absorption and fluorescence emission measurements, respectively. Besides, electrochromic performance of poly(SNS NI) has been compared to the both the film preparation method and poly(1-phenyl-2,5-dithiophen-2-ylpyrrole) [poly(SNS-P)] as a standard polymer. In the poly(SNS-NI), yellow color of the polymer film at neutral state converted to green and then dark blue upon the polymer film fully oxidized in the positive regime. SNS NI polymer film prepared via spin casting process exhibits a high contrast ratio in the near-IR region (Delta T% = 56% at 890 nm), a response time of about 1 s, high coloration efficiency (299 cm(2) C-1) and retained its performance by 98.6% even after 5000 cycles. Finally, the results clearly indicate that both electronic nature of the molecule and film preparation method have a major impact on electrochromic performance of these polymers. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.Öğe Push-pull type material having spirobifluorene as pi-spacer for dye sensitized solar cells(Pergamon-Elsevier Science Ltd, 2016) Can, Mustafa; Bilgili, Hakan; Demirak, Kadir; Gultekin, Burak; Koyuncu, Sermet; Kus, Mahmut; Zafer, Ceylan; Demic, Serafettin; Icli, SiddikTwo organic dyes for dye-sensitized solar cells (DSSC) based on spirobifluorene were synthesized and characterized. Electrochemical, spectroscopic and photovoltaic properties of the dyes have been investigated. Hexyloxy substituted triarylamine was used as electron donating moiety in the molecule while spirobifluorene and cyanoacrylic acid were used as pi-bridge and acceptor groups, respectively. MK162-sensitized solar cells exhibited a short-circuit current (I-SC) of 4,92 mA cm(-2), an open-circuit voltage (V-OC) of 520 mV and a fill factor (FF) of 0.59, resulting an overall power conversion efficiency of 1,52 where the reference cell, Z907 was yielded an overall conversion efficiency of 4.08% efficiency with 620 mV of V-OC and 14.51 mA cm(-2) of Isc under standard AM 1.5 illumination. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Öğe Structure-Property Relationship in pi-Conjugated Bipyridine Derivatives: Effect of Acceptor and Donor Moieties on Molecular Behavior(Amer Chemical Soc, 2019) Demir, Nuriye; Yakali, Gul; Karaman, Merve; Gokpek, Yenal; Denizalti, Serpil; Bilgili, Hakan; Dindar, Bircan; Demic, Seraffetin; Can, MustafaHere, we reported the photophysical studies, single-crystal X-ray crystallography, and density functional theory (DFT) calculations of two bipyridine derivative molecules. In addition, thermal gravimetric analysis and cyclic voltammetry studies were also performed for both compounds. According to crystallographic data, the pi-conjugated molecules have high-quality crystal structures as a result of intramolecular and intermolecular hydrogen bonds occurring through the molecules of the compound. It was determined that when the functional groups (F- and CH3O-) were introduced to the para positions, the molecules adopted slipped stacking (J-aggregate) and antiparallel cofacial stacking (H-aggregate). It was observed that these two bipyridine derivatives disclose the relationship between molecular conformation-molecular packing modes and photophysical behavior of organic solids. The results of DFT calculations supported the structural, spectroscopic, and photophysical data and confirmed the compositions of frontier molecular orbitals in both molecules.Öğe Synthesis, characterization, aggregation-induced enhanced emission and solvatochromic behavior of dimethyl 4 '-(diphenylamino)biphenyl-3,5-dicarboxylate: experimental and theoretical studies(Royal Soc Chemistry, 2020) Karaman, Merve; Demir, Nuriye; Bilgili, Hakan; Yakali, Gul; Gokpek, Yenal; Demic, Serafettin; Can, MustafaA novel triarylamine derivative dimethyl-4 '-(diphenylamino)biphenyl-3,5-dicarboxylate was synthesized and characterized using spectroscopic and single crystal X-ray diffraction analysis. in addition, theoretical studies, thermogravimetric analysis, cyclic voltammetry and solvent effect studies were also investigated. As a result of solvatochromism, the molecule shows an emission depending on the solvent polarity. Increased polarity caused a red shift of the emission wavelength by 149 nm. in addition, we investigated the intramolecular charge transfer (ICT) and aggregation emission properties with respect to the packing structure of crystalline aggregates. the molecule demonstrates aggregation-induced enhanced emission (AIEE) when the water proportion is greater than 40% in an acetone/water mixture. the maximum emission intensity of the molecule was 2 times higher in an 80% water/acetone mixture. As evidenced by the crystallographic results, the phenyl ring of the compound causes steric hindrance and this hindrance prevents undesirable face to face pi MIDLINE HORIZONTAL ELLIPSIS pi stacking interactions that would inevitably have an adverse effect on the fluorescence efficiency. the crystal packing of the molecule illustrates J-type stacking, which ensures that the crystal is highly fluorescent with a rigid planar structure. the results of DFT calculations are in good agreement with structural and spectroscopic data and verified the compositions of frontier molecular orbitals in similar compounds.Öğe Triarilaminlerin sentezleri ve elektrokimyasal özelliklerinin incelenmeleri(Ege Üniversitesi, 2010) Bilgili, Hakan; Demiç, ŞerafettinBu tezde, kopolifluoren türevlerinin sentezinde kullanılmaya uygun 4 adet spirofluoren monomerleri [2,7-dibromospiro(siklododekan-1,9'-fluoren), 2,7- dibromospiro(siklohekzan-1,9'-fluoren), 2,7-dibromospirobifluoren, 2,7-dibromo-4,5- diazaspirobifluoren ve 2,7-dibromo-4,5-diazaspirobifluoren] sentezlenmistir. Monomerlerin ve ara ürünlerin, sentezleri ayrıntılı olarak gösterilmis, moleküler yapıları 1H ve 13C NMR spektroskopisi kullanılarak aydınlatılmıstır. Sentezlenen türevlerin uygun yöntemler kullanılarak polimerlestirilmesinden elde edilecek olan kopolifluoren türevlerinin özellikle ısık yayan organik diyotlarda (OLED) ve diger fotoelektronik ve optoelektronik alanlarında kullanılmaları mümkündür.;s-conjugated polymer, copolyfluorene, spiroalkylfluorene, organic light emitting diods.;s-konjuge polimer, kopolifluoren, ısık yayan organik diyot, spiroalkilfluoren.
