Ultrafast intersystem-crossing in platinum containing π-conjugated polymers with tunable spin-orbit coupling

C. X. Sheng, S. Singh, A. Gambetta, T. Drori, M. Tong, S. Tretiak, Z. V. Vardeny

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

The development of efficient organic light-emitting diodes (OLED) and organic photovoltaic cells requires control over the dynamics of spin sensitive excitations. Embedding heavy metal atoms in π-conjugated polymer chains enhances the spin-orbit coupling (SOC), and thus facilitates intersystem crossing (ISC) from the singlet to triplet manifolds. Here we use various nonlinear optical spectroscopies such as two-photon absorption and electroabsorption in conjunction with electronic structure calculations, for studying the energies, emission bands and ultrafast dynamics of spin photoexcitations in two newly synthesized π-conjugated polymers that contain intrachain platinum (Pt) atoms separated by one (Pt-1) or three (Pt-3) organic spacer units. The controllable SOC in these polymers leads to a record ISC time of <∼1a ...ps in Pt-1 and ∼6a ...ps in Pt-3. The tunable ultrafast ISC rate modulates the intensity ratio of the phosphorescence and fluorescence emission bands, with potential applications for white OLEDs.

Original languageEnglish
Article number2653
JournalScientific Reports
Volume3
DOIs
Publication statusPublished - 2013
Externally publishedYes

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