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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- Sung-Ho Jin
- 발행연도
- 2018
- 저작권
- 부산대학교 논문은 저작권에 의해 보호받습니다.
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이 논문의 연구 히스토리 (13)
2018
Highly Efficient Solution-Processed Green Phosphorescent Organic Light-Emitting Diodes by Employing a New Bipolar Host Material
조우섬
,
아티싼 마헤쉬와란
,
제갈영순
외 1명
한국고분자학회 학술대회 연구논문 초록집
2018.10
학술대회자료
All Solution-Processable Phosphorescent Organic Light-Emitting Diodes Using Cross-linkable Iridium(III) Complex
조우섬
,
박호열
,
제갈영순
외 1명
한국고분자학회 학술대회 연구논문 초록집
2018.04
학술대회자료
Efficiency Enhancement of Solution-Processable Phosphorescent Organic Light-Emitting Diodes Using Ir(III) Complexes with Functional Group
조우섬
화학소재학과
2018.01
학위논문
2017
Improving the Performance of Single Emissive Layer White Organic Light-Emitting Diodes using Solution Processed Multifunctional Iridium(III) Complexes
조우섬
,
제갈영순
,
진성호
한국고분자학회 학술대회 연구논문 초록집
2017.10
학술대회자료
Improving the Performance of Solution-Processed Orange Phosphorescent Organic Light-Emitting Diodes using Multifunctional Iridium(III) Complexes
조우섬
,
간구리 사라다
,
제갈영순
외 1명
한국고분자학회 학술대회 연구논문 초록집
2017.04
학술대회자료
2015
Highly Efficient Solution-Processed Red Phosphorescent Organic Light-Emitting Diodes based on Multifunctional Iridium(III) Complexes
조우섬
,
진성호
한국고분자학회 학술대회 연구논문 초록집
2015.10
학술대회자료
Obtaining Highly Efficient Single Emissive Layer White Organic Light-Emitting Diodes Based on Solution Processed Two Iridium Complexes
조우섬
,
Gangu
,
i Sa
외 2명
한국고분자학회 학술대회 연구논문 초록집
2015.04
학술대회자료
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초록· 키워드
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The aim of this research is to design and evaluate Ir(III) complexes by introducing a functional group into the ancillary ligand of Ir(III) complexes and to fabricate PhOLED devices using the synthesized compound.
Multi-functional red, orange and blue Ir(III) complexe were designed by attaching a oxadiazole (OXD)-based electron transport (ET) group and carbazole (mCP)-based hole transport (HT) group to parent Ir(III) complexes. The synthesized materials were evaluated by characterising NMR, UV-vis, PL spectra, TGA, and CV. From the results, the newly altered multi-functional Ir(III) complexes were confirmed that the optical and electrochemical characteristics were similar even when the functional group (electron / electron transport) was introduced into the ancillary ligand as compared with the parent Ir(III) complexes. The devices were fabricated under same conditions, and the electro-optical characteristics were studied and evaluated. The attachment of additional functional groups facilitated in the improvement of device efficiency by 66% in red, 25% in orange and 13% in blue emitting devices.
It was confirmed that the spectrum of the emitted light was not different from the parent Ir(III) complexes. However, there was an increase in the efficiency of the newly designed multi-functional Ir(III) complexes. The reason for attaching an mCP-based HT unit and an OXD-based ET group to the parent Ir(III) complexes is to achieve a good charge balance in EML by improving the HT and ET properties of multi-functional Ir(III) complexes compared to the parent Ir(III) complexes. Following, WOLEDs were fabricated through the synthesized multi-functional Ir(III) complexes. It was also found that the device performance of a WOLEDs was increased by using multi-functional Ir(III) complexes, and a notable CRI = 74 was obtained. Additionally, new molecules were designed and synthesized by attaching thermally cross-linked groups to the main ligand of the red Ir(III) complex. In order to achieve all solution processed device, thermal cross-linking was undertaken, because the EML was cross-linked through UV will leave impurities while thermal does not and also to prevent the damage from the organic solvent used in the ETL.
Multi-functional red, orange and blue Ir(III) complexe were designed by attaching a oxadiazole (OXD)-based electron transport (ET) group and carbazole (mCP)-based hole transport (HT) group to parent Ir(III) complexes. The synthesized materials were evaluated by characterising NMR, UV-vis, PL spectra, TGA, and CV. From the results, the newly altered multi-functional Ir(III) complexes were confirmed that the optical and electrochemical characteristics were similar even when the functional group (electron / electron transport) was introduced into the ancillary ligand as compared with the parent Ir(III) complexes. The devices were fabricated under same conditions, and the electro-optical characteristics were studied and evaluated. The attachment of additional functional groups facilitated in the improvement of device efficiency by 66% in red, 25% in orange and 13% in blue emitting devices.
It was confirmed that the spectrum of the emitted light was not different from the parent Ir(III) complexes. However, there was an increase in the efficiency of the newly designed multi-functional Ir(III) complexes. The reason for attaching an mCP-based HT unit and an OXD-based ET group to the parent Ir(III) complexes is to achieve a good charge balance in EML by improving the HT and ET properties of multi-functional Ir(III) complexes compared to the parent Ir(III) complexes. Following, WOLEDs were fabricated through the synthesized multi-functional Ir(III) complexes. It was also found that the device performance of a WOLEDs was increased by using multi-functional Ir(III) complexes, and a notable CRI = 74 was obtained. Additionally, new molecules were designed and synthesized by attaching thermally cross-linked groups to the main ligand of the red Ir(III) complex. In order to achieve all solution processed device, thermal cross-linking was undertaken, because the EML was cross-linked through UV will leave impurities while thermal does not and also to prevent the damage from the organic solvent used in the ETL.
목차
Chapter 1. Introduction 11.1 Introduction of OLEDs and its applications 11.2 Luminescence 51.3 Luminescence mechanism 51.3.1 Fluorescence 51.3.2 Phosphorescence 51.3.3 TADF 61.4 Structure and working principle of OLEDs 71.5 Basic parameters of OLEDs 91.5.1 Turn-on Voltage (Von) 91.5.2 Luminance (L) 91.5.3 Current efficiency (CE) 91.5.4 Power efficiency (PE) 91.5.5 External quantum efficiency (EQE) 91.5.6 Commission international del''clairage (CIE) coordinates 101.5.7 Color rendering index (CRI) 101.6 Reference 10Chapter 2. Solution-Processable Highly Efficient Red PhOLED Based on Multi-Functional Ir(III) Complexes 122.1 Introduction 122.2 Experimental 132.2.1 General information 132.2.2 Synthesis of (4-phenyl-2-(thiophen-2-yl)quinoline) (TPQ) 142.2.3 Synthesis of (9-(3-(9H-carbazol-9-yl)-9H-carbazol-3-yl)methanol (mCP) 142.2.4 Synthesis of Ir(III) dimer 152.2.5 Synthesis of TPQIr-mCP 152.2.6 Device fabrication and measurements 172.3 Results and discussion 182.4 Conclusions 362.5 References 36Chapter 3. Enhanced Efficiency of Solution-Processable Orange PhOLEDs Using Multi-Functional Ir(III) Complexes 383.1 Introduction 383.2 Experimental 393.2.1 General information 393.2.2 Synthesis of bi[4-phenyl-2-(3-(trifluoromethyl)phenyl)quinoline]-iridium-piconlinate hydroxyl (m-CF3DPQIr-OH) 393.2.3 Synthesis of bi[4-phenyl-2-(3-(trifluoromethyl)phenyl)quinoline]-iridium(9-(3-(9Hcarbazol-9-yl)-9H-carbazol-3-yl) piconlinate (m-CF3DPQIr-mCP). 393.2.4 Synthesis of bi[4-phenyl-2-(3-(trifluoromethyl)phenyl)quinoline]-iridium4-(4-(5-phenyl1,3,4- oxadiazol-2-yl)phenoxy)picolinate (m-CF3DPQIr -OXD) 403.2.5 Device fabrication 403.3 Results and discussion 413.4 Conclusions 633.5 References 63Chapter 4. Highly Efficient of Solution-Processable Blue PhOLEDs by Multi-FunctionalIr(III) Complexes 674.1 Introduction 674.2 Experimental 684.2.1 General procedure for synthesis of tBuCN-FIrpic-OXD and tBuCN-FIrpic -mCP 684.2.2 Device fabrication 704.3 Results and discussion 704.4 Conclusions 954.5 References 95Chapter 5. Improving the Performance of Single Emissive Layer White OLEDs Based on Solution-Processable Multi-Functional Ir(III) Complexes. 975.1 Introduction 975.2 Experimental 985.2.1 General information 985.2.2 Device fabrication 985.3 Results and discussion 995.4 Conclusions 1105.5 References 110Chapter 6. All Solution-Processed Deep-Red PhOLEDs Based on Thermal Cross-Linked Ir(III) Complex. 1136.1 Introduction 1136.2 Experimental 1146.2.1 Synthesis of Dimethyl 5-hydroxyisophthalate 1146.2.2 Synthesis of Dimethyl 5-(octyloxy)isophthalate 1156.2.3 Synthesis of 5-(Octyloxy)isophthalohydrazide 1156.2.4 Synthesis of N,N-bis(4-bromobenzoyl)-5-(octyloxy)isophthalohydrazide 1166.2.5 Synthesis of 5,5-(5-(Octyloxy)-1,3-phenylene)bis(2-(4-bromophenyl)-1,3,4-oxadiazole) 1166.2.6 Synthesis of 5,5-(5-(Octyloxy)-1,3-phenylene)bis(2-(4-vinyl-[1,1-biphenyl]-4-yl)-1,3,4-oxadiazole) (DV-OXD) 1166.2.7 Synthesis of 5-(4-phenylquinolin-2-yl)thiophene-2-carbaldehyde (TPQ-CHO) 1176.2.8 Synthesis of dimer 1186.2.9 Synthesis of TPQ-CHO-Ir-pic 1186.2.10 Synthesis of TPQ-OH-Ir-pic 1186.2.11 Synthesis of TPQ-O-styryl-Ir-pic (X-TPQIr) 1196.2.12 Device fabrication 1196.3 Results and discussion 1206.4 Conclusions 1366.5 Reference 136Appendix 139Abstract (Korean) 143
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