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Combining a carbazole electron donor with high triplet energy, and a pyridine electron acceptor with high electron affinity, 3,5-bis(3-(carbazol-9-yl)phenyl)pyridine (35DCzPPy) is one of the most common bipolar host materials used in organic light-emitting diodes.
35DCzPPy is an isomer of 26DCzPPy, differing in the position of functionalisations of the central pyridine ring. 35DCzPPy is more electron-rich, so 26DCzPPy has a more balanced hole and electron injection and transport than 35DCzPPy.
Bipolar host materials are the molecules composed of an electron-donating moiety, capable of mediating hole injection and transportation; and an electron-withdrawing moiety capable of mediating electron injection and transportation.
High-efficiency red, green and blue phosphorescent homojunction organic light-emitting diodes based on bipolar host materials, C. Cai et al., Org. Electronics 12, 843-850 (2011); doi:10.1016/j.orgel.2011.01.021.
Pyridine-Containing Bipolar Host Materials for Highly Efficient Blue Phosphorescent OLEDs, S. Su et al., Chem. Mater., 20, 1691–1693 (2008); DOI: 10.1021/cm703682q.
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