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Efficient blue emitting organic light emitting diodes based on fluorescent solution processable cyclic phosphazenes

Authors
Journal
Organic Electronics
1566-1199
Publisher
Elsevier
Publication Date
Volume
9
Issue
2
Identifiers
DOI: 10.1016/j.orgel.2007.10.005
Keywords
  • Dendrimer
  • Oled
  • Blue Fluorescence

Abstract

Abstract Solution processable blue fluorescent dendrimers based on cyclic phosphazene (CP) cores incorporating amino-pyrene moieties have been prepared and used as emissive layers in organic light emitting diodes (OLEDs). These dendrimers have high glass transition temperatures, are monodisperse, have high purity via common chromatographic techniques, and form defect-free amorphous films via spin/dip coating. The solution processable blue light emitting OLEDs reach current efficiencies of 3.9 cd/A at brightness levels near 1000 cd/m 2. Depending on the molecular bridge used to attach the fluorescent dendron to the inorganic core, the emission wavelength changes from 470 to 545 nm, corresponding to blue and green light respectively. Via dilution experiments we show that this shift in emission wavelength is likely associated with molecular stacking of the amino-pyrene units.

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