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논문 기본 정보

자료유형
학위논문
저자정보

윤승희 (고려대학교, 고려대학교 대학원)

지도교수
최동훈
발행연도
2014
저작권
고려대학교 논문은 저작권에 의해 보호받습니다.

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이 논문의 연구 히스토리 (3)

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Organic light-emitting diodes (OLEDs) are of current scientific and commercial interests for applications in full-color display panels, flexible displays, and solid-state lighting. Compared to fluorescent OLEDs, considerable efforts have been made in developing phosphorescent OLEDs (Ph-OLEDs). Although green and red-emitting Ph-OLEDs have been intensely studied in the past, blue Ph-OLEDs are still challenging whether vacuum deposition or solution process.
At a first, background of organic electroluminescence was examined. recent progress in electophosphorescent material will be also emphasized, especially in blue phosphorescence. To figure out the trend of Ph-OLED development, I organize them according to function of material in Ph-OLED.
Second, novel photo-crosslinkable hole-transport and host polymers were demonstrated in this part. The oxetane-containing copolymers, which function as hole-transport layers (HTL), could be cured by UV irradiation in the presence of a cationic photoinitiator. The composition of the two monomers were varied to yield three different hole-transporting copolymers, (P(mCP-Ox)-I, -II, and -III). P(mCP-Ox)-III, the largest amount mCP unit composition, exhibited better performance than the other devices, which is attributed to the copolymer inducing more balanced charge carriers and carrier recombination in the emissive layer.
Finally, The small host materials, pPCB2CZ and mPCB2CZ, were synthesized and the examined materials properties. All host materials showed high triplet energy over 2.9 eV. The device of pPCB2CZ exhibited current efficiency of 46.5 cd /A, power efficiency of 41.8 lm/W and external quantum efficiency of 28.3 %.

목차

CHAPTER 1: Introduction to Organic Light-Emitting Diode 1
INTRODUCTION 2
1.1 Background of Organic Electroluminescence 2
1.2 Materials for Organic Light-Emitting Diode 3
1.2.1 Hole Transport Materials 6
1.2.2 Phosphorescent Emitting Materials 9
1.2.3 Host Materials for Phosphorescent Emitters 12
1.2.4 Electron Transport Materials 15
REFERENCES 18
CHAPTER 2: Photo-crosslinkable Carbazole-based Hole Transport Materials for Blue Phosphorescent Polymer Light-Emitting Diode 21
INTRODUCTION 22
EXPERIMENTAL SECTION 25
2.1 Materials 25
2.2 Synthesis of Hole Transport and Host Materials 25
2.3 Characterization and Measurements 29
2.3.1 Instrumental Analysis 29
2.3.2 Solvent Resistance of Hole Transport Materials 30
2.3.3 Measurement of Performances of Blue Phosphorescence Polymer Light-Emitting Diodes (Ph-PLEDs) 31
RESULT AND DISCUSSION 33
2.4 Synthesis and Characterization of Hole Transport and Host Materials 33
2.4.1 Synthesis of Hole Transport and Host Materials 33
2.4.2 Thermal Analysis of Hole Transport and Host Materials 40
2.4.3 Optical Analysis of Hole Transport and Host Materials 43
2.4.4 Electrochemical Analysis of Hole Transport and Host Materials 47
2.4.5 Solvent Resistance of the Hole Transport Materials 50
2.5 Devices Performance of Blue Ph-PLEDs 53
CONCLUSION 60
REFERENCES 61
CHAPTER 3: Carbazole and Carboline-based Host Materials for High Efficiency Blue Phosphorescent Organic Light-Emitting Diode 64
INTRODUCTION 65
EXPERIMENTAL SECTION 67
3.1 Materials 67
3.2 Synthesis of Host Materials 67
3.3 Characterization and Measurements 72
3.3.1 Instrumental Analysis 72
3.3.2 Measurement of Performances of Blue Phosphorescence Organic Light-Emitting Diodes (Ph-OLEDs) 72
RESULT AND DISCUSSION 74
3.4 Synthesis and Characterization of Host Materials 74
3.4.1 Synthesis of Host Materials 74
3.4.2 Thermal Analysis of Host Materials 78
3.4.3 Optical Analysis of Host Materials 80
3.4.4 Theoretical and Electrochemical Analysis of Host Materials 83
3.5 Devices Performance of Blue Ph-OLEDs 88
CONCLUSION 95
REFERENCES 96

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