표제지
목차
초록 9
Abstract 10
제1장 서론 11
제2장 이론적 배경 13
2.1. OLEDs의 발광 원리 13
2.2. TADF (Thermally Activated Delayed Fluorescence) 16
2.3. EQE (External Quantum Efficiency) 21
제3장 실험방법 24
3.1. TADF-OLEDs 유기물 설계 및 합성 24
3.2. 유기 박막 증착 및 PL 분석 24
3.3. TADF 소자 제작 및 J-V-L 측정 25
3.4. 시뮬레이션을 이용한 수치 계산 26
제4장 결과 및 고찰 29
4.1. TADF 발광 특성 및 결과 29
4.2. OLED 특성 및 결과 37
4.3. 시뮬레이션을 이용한 OLED 광학 특성 결과 41
제5장 결론 46
제6장 참고문헌 47
Table. 4.1. Photophysical Data and Rate Constants of Compounds 36
Table. 4.2. Device Performance of The TADF-OLEDs 40
Figure. 1. (a) LG Flexible Display (b) BOE Flexible OLED display (c) Hyundai MOBIS rollable Display Navigation 12
Figure. 2.1. The structure and recombination principle of OLEDs. 15
Figure. 2.2. The operating principle of (a) Fluorescence, (b) Phosphorescence and (c) Thermally Activated Delayed Fluorescence 20
Figure. 2.3. Light out-coupling principle 23
Figure. 3.1. (a) Chemical structures of 1-3. (b) X-ray crystal structure of 3. (c) UV-vis absorption (left) and PL (right) spectra of 1-3 in toluene (2.0 × 10-5 M). 27
Figure. 3.2. (a) Device structure and energy-level diagram (eV) of the TADF-OLEDs (b) Chemical structure consisting of the device. 28
Figure. 4.1. UV/Vis absorption spectra of PXZH, HBAO, HBTO, and HBPO in toluene (20 μM) at 298 K. 32
Figure. 4.2. UV/Vis absorption spectra of PXZBAO (1), PXZBTO (2), and PXZBPO (3) in toluene 20 μM) at 298 K. 33
Figure. 4.3. Fluorescence and phosphorescence spectra of (a) PXZBAO, (b) PXZBTO, and (c) PXZBPO in toluene at 77K. 34
Figure. 4.4. Temperature-dependent transient PL decay of the mCBP host films doped with 5 wt% of (a) PXZBAO, (b) PXZBTO and (c) PXZBPO. 35
Figure. 4.5. (a) EL spectra of D1(PXZBAO), D2(PXZBTO), D3(PXZBPO). (b) Current density-voltage-luminance (J-V-L) characteristics of D1-D3. (c)... 39
Figure. 4.6. (a) External quantum efficiency-luminance (ηEQE-L) characteristics of PXZBAO, PXZBTO, PXZBPO. (b) Angle-dependent PL...[이미지참조] 43
Figure. 4.7. Frontier molecular orbitals of PXZBAO (1), PXZBTO (2), and PXZBPO (3) (isovalue=0.03 e/ų) at their ground-state (S₀) geometries... 44
Figure. 4.8. Natural transition orbitals (NTOs) of compounds, PXZBAO (1), PXZBTO (2), and PXZBPO (3), for their lowest-lying 3nπ* and 3ππ*... 45