Title Page
Contents
Abstract 6
요약 7
Ⅰ. Introduction 8
Ⅱ. Results and discussion 11
Ⅲ. Conclusions 29
Ⅳ. Experimental section 30
Ⅴ. References 32
Ⅵ. Supplementary Information 38
Synthesis of the materials 40
LC Mass spectra of HIC1-HIC4 complexes 49
¹H NMR and ¹³C spectra of HIC1-HIC4 complexes 50
Simulation of horizontal transition dipole ratio depending on dopant orientation. 54
Supplementary Figures 55
Ⅶ. Appendix 60
Table 1. Photophysical properties of the heteroleptic Ir complexes. 24
Table 2. Device characteristics of the red phosphorescent OLEDs. 26
Figure 1. (a) Molecular structures of the heteroleptic Ir complexes with brief descriptions of the molecule design strategies. (b) Calculated permanent dipole... 13
Figure 2. Spatial distribution and level of the frontier orbitals of the Ir complexes calculated from DFT calculation in optimized geometry. 15
Figure 3. Horizontal ratio analysis of the transition dipole moment from angle-dependent PL measurement. Scatters and lines correspond to experimental... 16
Figure 4. (a) Iso-surface of the electrostatic potential of (a) the heteroleptic Ir complexes and (b) the host molecules. (c) Prediction of horizontal dipole ratio... 18
Figure 5. UV-Vis absorption and PL spectra of the Ir complexes in the solution. 23
Figure 6. (a) Device structure, (b) EL spectra, (c) current density-voltage-luminance (J-V-L), and (d) EQE-luminance (EQE-L) characteristics of the OLEDs. 27
Figure 7. (a) 1931 CIE coordinates of the OLEDs employing the Ir complexes with a DCI-P3 color coverage diagram. (b) Horizontal dipole ratio and... 28