Citation: Wang Xu-chao, Bai Ke-yan, Ding Jun-qiao, Wang Li-xiang. Synthesis and Characterization of Bipolar Blue-emitting Poly(spirobifluorene)s Containing Carbazole and Arylphosphine Oxide[J]. Acta Polymerica Sinica, ;2018, (2): 239-247. doi: 10.11777/j.issn1000-3304.2018.17193 shu

Synthesis and Characterization of Bipolar Blue-emitting Poly(spirobifluorene)s Containing Carbazole and Arylphosphine Oxide

1.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022
2.
University of Chinese Academy of Sciences, Beijing 100049

Corresponding author: Ding Jun-qiao, junqiaod@ciac.ac.cn Wang Li-xiang, lixiang@ciac.ac.cn
Received Date: 21 July 2017
Revised Date: 22 August 2017

A series of bipolar blue-emitting poly(spirobifluorene)s, named PSFCzPO10, PSFCzPO20 and PSFCzPO30, have been designed and synthesized via Suzuki polycondensation, where carbazole and arylphosphine oxide are incorporated as the hole-and electron-transporting units, respectively. These resultant poly(spirobifluorene)s are thermally stable with decomposition temperatures up to 380 ℃ and no glass transition or melting behaviors are observed in the range of 25-280 ℃, which are beneficial for the fabrication of long-trem PLEDs. Moreover, compared to the reference polymer Cz-PSF only containing carbazole, the introduction of the arylphosphine oxide unit does not obviously affect their photoluminescence (PL) and the corresponding PL quantum yields of PSFCzPO10-PSFCzPO30 in solid states. However, with increasing content of the arylphosphine oxide, the lowest unoccupied molecular orbital (LUMO) levels are lowered from -2.22 eV for Cz-PSF to -2.68 eV for PSFCzPO30, whereas the highest occupied molecular orbital (HOMO) levels remain nearly unchanged (-5.39~-5.40 eV). This trend implies the favored electron injection and transporting although the hole injection barriers seem to be the same for all the polymers. That is, the bipolar transporting and thus charge balance to some degree are within our expectation for PSFCzPO10-PSFCzPO30. Among them, PSFCzPO10 exhibits the best current efficiency of 1.19 cd A^-1 based on a single-layer device structure, which is about twofolds higher than that of Cz-PSF (0.39 cd A^-1). In addition, with PSFCzPO10 as the emitting layer and TPPO as the alcohol-soluble electron-transporting layer, the corresponding all-solution-processed multilayer device is successfully assembled through orthogonal sequential solvent processing. And its current efficiency is further up to 1.93 cd A^-1 together with CIE coordinates of (0.16, 0.14). Meanwhile, the electroluminescence is nearly independent of the driving voltages, indicative of the good blue spectral stability. These results clearly demonstrate that the bipolar design is a promising strategy to improve the efficiency and stability of blue-emitting poly(spirobifluorene)s applied in PLEDs.
- Poly (spirobifluorenen) s,
- Bipolar transporting,
- Carbazole,
- Arylphosphine oxide,
- PLEDs
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