Influence of integrated alkyl-chain length on the mesogenic and photophysical properties of platinum-based metallomesogens and their application for polarized white OLEDs

Yafei Wang, Jiang Fan, Junwei Shi, Hongrui Qi, Etienne Baranoff, Guohua Xie, Qingguo Li, Hua Tan, Yu Liu, Weiguo Zhu

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)
179 Downloads (Pure)

Abstract

In this context, a series of platinum complexes containing a triphenylene unit, namely Pt5single bondPt8, was prepared and characterized. Platinum complex Pt6 shows a clearly column liquid crystalline property, confirmed by differential scanning calorimetry, polarized optical microscopy and X-ray diffraction. These platinum complexes only display monomolecular emission both in solution and in neat film, an effect attributed to the presence of carbazole as a bulky group disfavoring aggregation of the complexes. Hole mobilities in the range of 10−5–10−6 cm2 V−1 s−1 were obtained for the annealed platinum complexes films. It was found that the method to align the emissive layer has a crucial role on the performance of the devices. The first example of polarized phosphorescent white organic light-emitting diode (OLED) with polarized ratio of 1.4 was achieved in Pt6-based device. This research opens up a new aspect of phosphorescent metallomesogens application for polarized white light emission.
Original languageEnglish
Pages (from-to)238-247
JournalDyes and Pigments
Volume133
Early online date2 Jun 2016
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • Platinum metallomesogens
  • Triphenylene unit
  • Luminescence
  • Polarized OLEDs

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