Synthesis, Energy transfer, Electroluminescence and Electroluminescence of Iridium Complexes with Polyphenyl Ligands
Date Issued
2006
Date
2006
Author(s)
Chen, Hung-Chun
DOI
zh-TW
Abstract
Phosphorescent materials of iridium complexes had been attracted much attention in recent years. The device performance of the pure organic compounds could be scarcely comparable to the inorganic complexes. The red and green materials have progressed in OLED, while the results of blue materials were unsatisfied.
The research topic in this article is to tune the color of phosphorescent material of C^N2Ir(LX)b by using various C^Na ligand. Modification of the functional group, by replacing the hydrogen atom to fluoro group at the 2,4 position or CF3 at the 3,5 position on the phenyl ring, we could get emission from green to blue . We also introduce the polyphenyl group for the goal of energy transfer, and increase the steric hindrance to avoid the self quenching between iridium complexes.
In the results of the physical and chemical properties of these emitting materials, we observed: (1) They have good thermal stability between 200℃-300℃ by thermogravimetry analysis. (2) They also have good reversibility by the test of cyclic-voltammetry. (3) We could clearly distinguish the 1MLCT from 3MLCT absorption by the result of Ir(III)’s strong spin-orbital coupling effect. (4) In the photoluminescence, we found the emission could be tuned from green (510 nm) to blue (485 nm) by the modification of the substituents.
a：C^N = cyclometalating ligand
b：LX = monoanionic and bidentate ancillary ligand
Subjects
磷光
有機發光二極體
發光材料
銥金屬錯合物
OLED
Phosphorescence
Bis-Cyclometalated Iridium Comple
Type
thesis
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