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      https://www.ias.ac.in/article/fulltext/jcsc/131/09/0094

    • Keywords

       

      Acridone; thermally activated delayed fluorescence; organic light-emitting devices

    • Abstract

       

      Acridone (acceptor) and naphthylamine (donor) based Donor-Acceptor-Donor (D-A-D) compound (1) was synthesised, characterised and its thermally-activated delayed fluorescence (TADF) properties were studied in detail. Compound 1 is fluorescent and emits in the green region (550 nm). The energy gapbetween the ground and the lowest excited singlet (S1) state is estimated to be 2.55 eV. The energy gap between the CT singlet and triplet states (ΔEST) was found to be ~0.3 eV. Small ΔES1-T1 is one of the important criteria for TADF to take place in a molecule and thus detailed photophysics has been studied.Transient lifetime measurements showed an increase in the fluorescence lifetime (s) on purging with N2, as compared with that in air-saturated solution, indicating the involvement of the triplet state in emission. Emission at 550 nm was also observed with a delay of 100 ls which corresponded to the delayed fluorescencein 1. The lifetime of TADF was found to be 176 ls. Applications of TADF materials in organic lightemitting devices (OLEDs) has gotten attention as TADF materials utilise the triplet excitons which helps in increasing internal quantum efficiency of device. Air-saturated based on 1 were fabricated and their intensity was found to be nearly as high as 17,000 Cd/m2 at 25 mA/cm2 which was comparable to many of the known TADF emitters.

    • Author Affiliations

       

      ANKUR A AWASTHI1 NIKITA GUPTA1 QAMAR T SIDDIQUI1 2 PRADNYA PARAB3 DIPAK K PALIT1 SANGITA BOSE3 NEERAJ AGARWAL1

      1. School of Chemical Sciences, UM-DAE Centre for Excellence in Basic Sciences, University of Mumbai, Kalina, Santacruz (E), Mumbai 400 098, Maharashtra, India
      2. Department of Chemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
      3. School of Physical Sciences, UM-DAE Centre for Excellence in Basic Sciences, University of Mumbai, Kalina, Santacruz (E), Mumbai 400 098, Maharashtra, India
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