Photophysics of Zinc 2,11,20,29-Tetra- tert-butyl-2,3-Naphthalocyanine: Aggregation-Induced S2Emission and Rapid Intersystem Crossing in the Solid State

Carolyn E. Ramirez, Robert Jacobberger, Ryan M. Young*, Michael R. Wasielewski*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Aggregation can dramatically alter the photophysics of organic chromophores by modulating their electronic properties. Zinc 2,11,20,29-tetra-tert-butyl-2,3-naphthalocyanine (t-Bu-ZnNc) in thin films emits primarily from its second excited singlet state (S2), while t-Bu-ZnNc in solution obeys the well-known Kasha rule and emits from S1. This behavior most likely results from the hindered motion of the t-butyl groups in the rigid, closely packed thin films. This is corroborated by the observation of enhanced S2 emission in low-temperature glassy solutions. The t-Bu-ZnNc films also show rapid intersystem crossing to form a long-lived triplet excited state an order of magnitude faster than in solution due to the enhanced density of triplet states and the concomitant reduced singlet-triplet energy gap between the broadened excited state manifolds in the closely packed solid.

Original languageEnglish (US)
Pages (from-to)11680-11689
Number of pages10
JournalJournal of Physical Chemistry C
Volume126
Issue number28
DOIs
StatePublished - Jul 21 2022

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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