Synthesis of dibenzothiophene-containing ladder polysilsesquioxane as a blue phosphorescent host material

Chemistry : a European Journal
Zhongjie RenShouke Yan

Abstract

A ladder polysilsesquioxanes with side chain of dibenzothiophene groups (BS-LPSQ) was successfully synthesized. The ladder structure of BS-LPSQ was characterized by MALDI-TOF MS, XRD, and (1)H NMR spectroscopy. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), atomic force microscopy (AFM), and spectroscopic analyses revealed that the BS-LPSQ has good film-forming ability, high thermal and morphological stability, and good miscibility to the dopant iridium bis(4,6-difluorophenyl)pyridinato-N,C(2)-picolinate (FIrpic), high triplet energy, and a wide bandgap. In addition, compared with the ringed polysiloxane BS-PSQ phosphorescent host material reported previously, the ladder structure of BS-LPSQ has not only a higher thermal resistance, but also could prevent molecular aggregation and effectively avoid quenching of fluorescence. Thus, the BS-LPSQ may be used as a better host for the blue-light-emitting iridium complex FIrpic. The performance of the electrophosphorescent device, based on the ladder BS-LPSQ as the active layer, is superior to that of ringed BS-PSQ and any other polyhedral oligomeric silsesquioxane (POSS)-based or polymer host materials.

References

Apr 13, 2007·Journal of the American Chemical Society·Mee Yoon LoAlan Sellinger
Feb 21, 2009·Chemical Reviews·Andrew C GrimsdaleAndrew B Holmes
Mar 11, 2010·Advanced Materials·Madhusudan SinghGhassan E Jabbour

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Citations

Aug 12, 2014·Chemistry : a European Journal·Seiji WataseKimihiro Matsukawa
Mar 5, 2014·Angewandte Chemie·Bo PengNuno Maulide
Nov 24, 2021·The Journal of Physical Chemistry Letters·Lingtai YueWenjun Yang

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