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Efficient Light‐Emitting Devices Based on Phosphorescent Polyhedral Oligomeric Silsesquioxane Materials
Author(s) -
Yang Xiaohui,
Froehlich Jesse D.,
Chae Hyun Sik,
Li Sheng,
Mochizuki Amane,
Jabbour Ghassan E.
Publication year - 2009
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200900050
Subject(s) - silsesquioxane , phosphorescence , materials science , quantum efficiency , optoelectronics , iridium , fluorescence , polymer , optics , organic chemistry , catalysis , physics , chemistry , composite material
Synthesis, photophysical, and electrochemical characterizations of iridium‐complex anchored polyhedral oligomeric silsesquioxane (POSS) macromolecules are reported. Monochromatic organic light‐emitting devices based on these phosphorescent POSS materials show peak external quantum efficiencies in the range of 5–9%, which can be driven at a voltage less than 10 V for a luminance of 1000 cd m −2 . The white‐emitting devices with POSS emitters show an external quantum efficiency of 8%, a power efficiency of 8.1 lm W −1 , and Commission International de'lÉclairage coordinates of (0.36, 0.39) at 1000 cd m −2 . Encouraging efficiency is achieved in the devices based on hole‐transporting and Ir‐complex moieties dual‐functionalized POSS materials without using host materials, demonstrating that triplet‐dye and carrier‐transporting moieties functionalized POSS material is a viable approach for the development of solution‐processable electrophosphorescent devices.