2 research outputs found
Novel Strategy for Photopatterning Emissive Polymer Brushes for Organic Light Emitting Diode Applications
A light-mediated
methodology to grow patterned, emissive polymer
brushes with micron feature resolution is reported and applied to
organic light emitting diode (OLED) displays. Light is used for both
initiator functionalization of indium tin oxide and subsequent atom
transfer radical polymerization of methacrylate-based fluorescent
and phosphorescent iridium monomers. The iridium centers play key
roles in photocatalyzing and mediating polymer growth while also emitting
light in the final OLED structure. The scope of the presented procedure
enables the synthesis of a library of polymers with emissive colors
spanning the visible spectrum where the dopant incorporation, position
of brush growth, and brush thickness are readily controlled. The chain-ends
of the polymer brushes remain intact, affording subsequent chain extension
and formation of well-defined diblock architectures. This high level
of structure and function control allows for the facile preparation
of random ternary copolymers and red–green–blue arrays
to yield white emission
Highly Photoluminescent Nonconjugated Polymers for Single-Layer Light Emitting Diodes
The
design, synthesis, and characterization of solution-processable polymers
for organic light emitting diode (OLED) applications are presented.
Theoretical calculations were employed to identify a carbazole-pyrimidine
based building block as an optimized host material for the emissive
layer of an idealized OLED stack. Efficient, free radical homopolymerization
and copolymerization with a novel methacrylate-based heteroleptic
iridiumÂ(III) complex leads to a library of nonconjugated polymers
with pendant semiconductors. Optoelectronic characterization reveals
impressive photoluminescence quantum yield (PLQY) values exceeding
80% and single-layer OLEDs show optimal performance for copolymers
containing 6 mol % of iridium comonomer dopant