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Columnar Iridium(III) Metallomesogens Based on Polycatenar Pyridyltetrazolate with Ambipolar Carrier Mobility Behavior
journal contribution
posted on 2018-12-13, 22:44 authored by Guo Zou, Li Zhao, Longwei Zeng, Kaijun Luo, Hailiang Ni, Haifeng Wang, Quan Li, Wenhao Yu, Xuelian LiIn
this paper, we have designed and synthesized a series of neutral
liquid-crystalline iridium(III) complexes based on polycatenar 2,5-diphenylpyridine
and pyridyltetrazolate derivatives. Iridium(III) complexes all display
highly emissive behavior with photoluminescence quantum yields in
the range of 0.45–0.66 and a maximum emission wavelength at
∼563 nm. Hexagonal columnar mesophases of iridium(III) complexes
can be obtained by changing the number and length of peripheral alkoxyl
chains attached to a 2,5-diphenylpyridine ligand (main ligand) and
a pyridyltetrazolate ligand (auxiliary ligand). Moreover, experimental
results of the charge transport properties for these iridium(III)
complexes, which were measured by the space charge limited-current
method, exhibit ambipolar carrier mobility behavior. In particular,
the liquid-crystalline iridium(III) complexes can self-organize into
one-dimensional (1D) nanostructure after thermal annealing treatment
in their liquid-crystalline phase. The devices based on liquid crystal
film display improved charge transport behavior compared with that
of the devices based on polycrystalline film, indicating 1D nanostructure
is beneficial to charge carrier injection and transportation.
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Keywords
pyridyltetrazolate ligandcharge carrier injectioncharge transport propertiesPolycatenar Pyridyltetrazolate1 D nanostructureHexagonal columnar mesophasesexhibit ambipolar carrier mobility behaviorphotoluminescence quantum yieldscrystal film displaypyridyltetrazolate derivativesAmbipolar Carrier Mobility Behaviorliquid-crystalline phasediphenylpyridinespace charge limited-current methodemissive behavioremission wavelengthIridiumiridiumcharge transport behaviorcomplexdevicealkoxyl chainsannealing treatment
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