Sublimation not an innocent technique: A case of bis-cyclometalated iridium emitter for OLED

Research output: Contribution to journalArticlepeer-review


  • Etienne Baranoff
  • Stéphane Suàrez
  • Philippe Bugnon
  • Claudia Barolo
  • Roberto Buscaino
  • Rosario Scopelliti
  • Libero Zuppiroli
  • Michael Graetzel
  • Md K. Nazeeruddin

Colleges, School and Institutes

External organisations

  • Laboratory for Photonics and Interfaces
  • School of Basic Sciences
  • Swiss Federal Institute of Technology
  • Università Degli Studi di Torino
  • Laboratoire d'Optoélectronique des Matériaux Moléculaires
  • Dipartimento di Chimica Generale e Chimica Organica


Isomerization of a neutral bis-cyclometalated iridium(III) complex has been observed for the first time during the preparation of vacuum-processed organic light-emitting devices (OLEDs) and reproduced in solution. Isolation of the isomer revealed a cis organization of the two pyridine rings of the cyclometalating ligands. Photophysical studies show very similar emission properties of the two isomers. However, due to in situ isomerization, it is only possible to prepare vacuum-processed OLED devices having a mixture of isomers.


Original languageEnglish
Pages (from-to)6575-6577
Number of pages3
JournalInorganic Chemistry
Issue number15
Publication statusPublished - 4 Aug 2008

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