표제지
목차
초록 9
Abstract 10
제1장 서론 11
제2장 이론적 배경 13
2.1. 유기발광다이오드 (OLED) 13
2.2. 엑시플렉스 (Exciplex) 15
2.3. 발광 방식 17
2.4. 외부 양자 효율 (EQE) 21
제3장 실험방법 25
3.1. Exciplex host 설계 및 선택 25
3.2. Organic thin film 제작 및 정면 PL spectrum 분석 25
3.3. Exciplex formation OLEDs 제작 25
3.4. Exciplex formation OLEDs 분석 26
제4장 결과 및 고찰 29
4.1. Exciplex host 특성 및 결과 29
4.2. Exciplex 형성에 따른 PL spectrum 분석 및 결과 34
4.3. Exciplex formation OLEDs의 특성 및 결과 36
제5장 결론 47
제6장 참고문헌 48
Table 4.1.1. UV/Vis absorption, λ (wavelength), bandgap of the host molecules 32
Table 4.1.2. Energy levels and photophysical properties of the host molecules. 33
Table 4.3.1. λ (wavelength)/FWHM and color coordinates of each blue-emitting PhOLEDs 40
Table 4.3.2. Device performance of each blue-emitting PhOLEDs 41
Figure 1.1.1. (a) Samsung Galaxy Z flip. (b) Digital cockpit made with OLEDs for vehicles(CES2023). (c) LG rollable OLED display (LG Display) 12
Figure 2.1.1. Multilayer structure and recombination principle of an OLEDs 14
Figure 2.2.1. Process of the exciplex as the (a) Emitter (b) Host 16
Figure 2.3.1. Luminescence mechanisms of (a) Fluorescence (b) Phosphorescence 19
Figure 2.3.2. Dopant molecular structure of (a) Fluorescence (b) Phosphorescence 20
Figure 2.4.1. Factors affecting outcoupling efficiency and their magnitudes 23
Figure 2.4.2. Horizontal dipole ratio analysis of OLEDs 24
Figure 3.1.1. Summary of host molecule structures and synthesis m ethods. 27
Figure 3.2.1. Device structure and band diagram of (a) D1 (b) D2 (c) D3 (d) D4. 28
Figure 4.1.1. Summary of host molecule structures and synthesis methods 31
Figure 4.2.1. Normalized PL intensity vs. wavelength characteristics of thin films using four different mixed hosts (dotted lines) and five different single... 35
Figure 4.3.1. Optoelectrical properties of each four different blue emitting PhOLEDs. (a) J-V V-L characteristics. (b) EQE-J characteristics. (c) 38
Figure 4.3.2. J-V characteristics of (a) hole-only devices, and (b) electron-only devices 39
Figure 4.3.3. Transient electroluminescence (Tr-EL) characteristics of blue-emitting PhOLEDs. (Upper panel) Tr-EL characteristics of PhOLEDs in the full... 44
Figure 4.3.4. Capacitance-voltage-luminance curves of each PhOLEDs. 46