|
|
| Type |
Poster Presentation |
| Area |
Inorganic Chemistry |
| Room No. |
Exhibition Hall 2+3 |
| Time |
10월 19일 (목요일) 11:00~12:30 |
| Code |
INOR.P-10 |
| Subject |
Manipulating the Number of o-Carboranyl Ligands of Iridium(III) Cyclometalates for the Improved Photophysical and Electroluminescent Properties |
| Authors |
NGHIA NGUYEN, HeeChai Lee, AJAY KUMAR, Min Hyung Lee*
Department of Chemistry, University of Ulsan, Korea
|
| Abstract |
A series of iridium(III) cyclometalates with mono-, bis-, and tris-o-carboranyl ligands, fac-[m-(2-MeCB)ppy]nIr(ppy)3-n (n = 1–3, m = 5 (3a-5a); m = 4 (3b-5b); 2-MeCB = 2-methyl-o-carboran-1-yl; ppy = 2-phenylpyridinato-C2,N), was prepared to investigate the impact of the number of o-carboranyl ligands on the photophysical and electroluminescent properties. While the phosphorescence wavelengths of 3a-5a and 3b-5b were blue-shifted or red-shifted with respect to that of fac-Ir(ppy)3 (6), respectively, both series underwent gradual hypsochromic shifts as the number of carboranyl ligands was increased. All of the complexes exhibited moderate to high phosphorescence quantum efficiencies in toluene and the quantum efficiency increased as the number of carboranyl ligands increased. Solution-processed green phosphorescent organic light-emitting diodes (PhOLEDs) incorporating the 5-substituted complexes (3a-5a) as emitters exhibited a similar level of high performance, of which the best performance was observed for devices based on 4a. Furthermore, vacuum-deposited devices were successfully fabricated with mono- and bis-carboranyl complexes, 3a and 4a. The resulting devices showed excellent performance, which was improved by ca. 40% compared to those of the solution-processed devices.
|
| E-mail |
tashi@naver.com |
|
120th General Meeting of the KCS