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New blue phosphorescence from trifluorosulfonyl-substituted iridium complexes
- Authors
- Ha, Yeon Hee; Sohn, Sunyoung; Han, Seung-Hoon; Kim, Bong Gon; Ahn, Hyungju; Jung, Sungjune; Kwon, Soon-Ki; Kim, Yun-Hi
- Issue Date
- Apr-2019
- Publisher
- Elsevier BV
- Keywords
- Organic light emitting diodes; Blue phosphorescence; Iridium complex; Grazing incidence wide-angle X-ray diffraction; Preferential orientation along the out-of-plane direction
- Citation
- Dyes and Pigments, v.163, pp 684 - 691
- Pages
- 8
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- Dyes and Pigments
- Volume
- 163
- Start Page
- 684
- End Page
- 691
- ISSN
- 0143-7208
1873-3743
- Abstract
- For color-pure phosphorescence organic light emitting diodes (PHOLEDs), we synthesized the trifluorometh) sulfonyl substituted ligand and two new blue Iridium complexes with perfluoro-sulfonyl group (SOCF(3)pic an, SOCF(3)mpic). The both iridium complexes showed similar photophysical and thermal properties while the HON energy leves of two Iridium complexes slightly differnet to be -5.84 eV for SOCF(3)pic and -5.74 eV fa SOCF(3)mpic, respectively. The device with the SOCF(3)mpic dopant exhibited higher device efficiencies of 7.17 cd A and 3.7% compared to that with the SOCF(3)pic dopant (4.03 cd/A and 2.78%). Two-dimensional GIXD image of scattered X-ray intensity from surface to full depth for SOCF(3)pic-doped and SOCF(3)mpic-doped TCTA:4PTP films were characterized for preferential orientation along the out-of-plane direction.
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