6. 4-SBF with electron-rich substituent
To the best of our knowledge, there are only five examples in the literature of SBF derivatives substituted in position 4 with an electron-donating group being used as PhOLED host materials; they are shown in figure 14 . These molecules are derived from SBF substituted in C4 by a dibenzofuran (4-DBF-SBF) , dibenzothiophene (4-DBT-SBF)
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4-SBF with electron-rich substituent
Other 4-SBFs used in organic electronics
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