Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 135, Issue 38, Pages 14321-14328Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja4065188
Keywords
-
Categories
Funding
- Industrial Strategic Technology Development Program [10035225]
- MKE/KEIT
- Nanomaterial Technology of NRF [2012049647]
- Samsung display
- National Research Foundation of Korea [2012M3A7B4049645] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
The new deep-blue iridium(III) complexes, (TF)(2)Ir(pic), (TF)(2)Ir(fptz), (HF)(2)Ir(pic), and (HF)(2)Ir(fptz), consisting of 2 ',4 ''-difluororpheny1-3-methylpyridine with trifluoromethyl carbonyl or heptafluoropropyl carbonyl at the 3 ' position as the main ligand and a picolinate or a trifluoromethylated-triazole as the ancillary ligand, were synthesized and characterized for applications in organic light-emitting diodes (OLEDs). Density function theory (DFT) calculations showed that these iridium complexes had a wide band gap, owing to the introduction of the strong electron withdrawing perfluoro carbonyl group. Time-dependent DFT (TD-DFT) calculations suggested that their lowest triplet excited state was dominated by a HOMO -> LUMO transition and that the contribution of the metal-to-ligand charge transfer (MLCT) was higher than 34% for all four complexes, indicating that strong spin orbit coupling exists in the complexes. The 10 wt % (TF)(2)Ir(pic) doped 9-(3-(9H-carbazole-9-yl)phenyl)-3-(dibromophenylphosphoryl)-9H-carbazole (mCPPO1) film exhibited the highest photoluminescence quantum yield of 74 +/- 3% among the films based on the four complexes. Phosphorescent OLEDs based on (TF)(2)Ir(pic) and (TF)(2)Ir(fptz) exhibited maximum external quantum efficiencies of 17.1% and 8.4% and Commission Internationale de l'Eclairage (CIE) coordinates of (0.141, 0.158) and (0.147, 0.116), respectively. These CIE coordinates represent some of the deepest blue emissions ever achieved from phosphorescent OLEDs with considerably high EQEs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available