Large enhancement of intersystem crossing in polyfluorenes by iridium-complex doping

Hua Hsien Liao, Chia Ming Yang, Chi Hui Wu, Sheng Fu Horng, Wei Shan Lee, Hsin-Fei Meng*, Jow Tsong Shy, Chain-Shu Hsu

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

Photoinduced absorption is used to study the intersystem crossing (ISC) rate of two polyfluorenes doped with iridium (III) tris[2-(4-totyl)pyridinato- N,C2]. It is found that the triplet exciton lifetime of polyfluorene is reduced by the dopants. But instead of decreasing, the population density of polyfluorene triplet exciton increases by almost one order of magnitude. The finding shows that the ISC rate can increase over 100 times due to the spin-orbital interaction with the Ir ion even though it is covered by the ligands. Specifically, the ISC lifetime changes from the intrinsic value of 62 ns to as short as 0.28 ns upon 10% doping.

Original languageEnglish
Article number013504
JournalApplied Physics Letters
Volume90
Issue number1
DOIs
StatePublished - 15 Jan 2007

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