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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/120/04/0355-0362

    • Keywords

       

      Fluorene; DFT calculation; blue emitters; HOMO level and OLED.

    • Abstract

       

      A new class of highly fluorescent 9,9'-bis-(alkyl)-2,7-diarylfluorene having electron withdrawing or electron donating groups on the 𝑝-phenyl positions were synthesized and characterized. The highly luminescent fluorene derivatives, 1-6 showed blue emission (376-416 nm), narrow FWHM (∼ 50 nm), high quantum yield ($\phi_{\text{F}} = 0.12-0.87$) and short fluorescence lifetimes, $\tau_{\text{F}} = 0.23-1.14$ ns. The HOMO levels of 9,9'-bis-(alkyl)-fluorene were tuned by the p-substituents at 2,7-phenyl group. Hammett correlation with $E_{\text{HOMO}}$ of these new molecules provides an effective tool to predict the HOMO level of similar molecules prior to the synthesis. These data indicate that they are useful as emitting materials for organic light emitting devices, OLEDs.

    • Author Affiliations

       

      Neeraj Agarwal1 Pabitra K Nayak1 N Periasamy1

      1. Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005

    • Dates

       
      Published
      July 2008
      Manuscript received
      8 May 2008
      Manuscript revised
      16 June 2008

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