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Journal of Chemical Sciences

, 131:94 | Cite as

Synthesis of acridone-naphthylamine derivative and its thermally-activated delayed fluorescence studies for application in OLEDs

  • ANKUR A AWASTHI
  • NIKITA GUPTA
  • QAMAR T SIDDIQUI
  • PRADNYA PARAB
  • DIPAK K PALIT
  • SANGITA BOSEEmail author
  • NEERAJ AGARWALEmail author
Regular Article
  • 228 Downloads

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 gap between 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 (∆EST) was found to be ~0.3 eV. Small ∆ES1-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 (τ) 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 µs which corresponded to the delayed fluorescence in 1. The lifetime of TADF was found to be 176 µs. Applications of TADF materials in organic light-emitting 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.

Graphic abstract

Acridone-amine derivatives was synthesized and its photophysical properties were carried out to establish TADF. It was also used in fabrication of OLEDs.

Keywords

Acridone thermally activated delayed fluorescence organic light-emitting devices 

Notes

Acknowledgement

We thank Swati Dixit for her assistance in cyclic voltammetric studies. We thank Tata Institute of Fundamental Research, Mumbai for NMR and MALDI-TOF. We also thank the Radiation and Photochemistry Division, Bhabha Atomic Research Centre for TCSPC. NA and SB thank the Department of Science and Technology for partial financial support (EMR/2017/000805).

Supplementary material

12039_2019_1667_MOESM1_ESM.pdf (978 kb)
Supplementary material 1 (PDF 978 kb)

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  • ANKUR A AWASTHI
    • 1
  • NIKITA GUPTA
    • 1
  • QAMAR T SIDDIQUI
    • 1
    • 2
  • PRADNYA PARAB
    • 3
  • DIPAK K PALIT
    • 1
  • SANGITA BOSE
    • 3
    Email author
  • NEERAJ AGARWAL
    • 1
    Email author
  1. 1.School of Chemical Sciences, UM-DAE Centre for Excellence in Basic SciencesUniversity of MumbaiMumbaiIndia
  2. 2.Department of ChemistryAligarh Muslim UniversityAligarhIndia
  3. 3.School of Physical Sciences, UM-DAE Centre for Excellence in Basic SciencesUniversity of MumbaiMumbaiIndia

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