Photoluminescence in a Thermally Activated Delayed Fluorescence Emitter for Organic Light-emitting Diodes

DOI Web Site 3 Citations
  • NIWA Akitsugu
    Department of Physics and Electronics, Osaka Prefecture University
  • TAKAKI Kensho
    Department of Physics and Electronics, Osaka Prefecture University
  • KOBAYASHI Takashi
    Department of Physics and Electronics, Osaka Prefecture University The Research Institute for Molecular Electronic Devices (RIMED)
  • NAGASE Takashi
    Department of Physics and Electronics, Osaka Prefecture University The Research Institute for Molecular Electronic Devices (RIMED)
  • GOUSHI Kenichi
    Center for Organic Photonics and Electronics Research (OPERA), Kyushu University JST, ERATO, Adachi Molecular Exciton Engineering Project International Institute for Carbon Neutral Energy Research (WPI-I<sup>2</sup> CNER), Kyushu University
  • ADACHI Chihaya
    Center for Organic Photonics and Electronics Research (OPERA), Kyushu University JST, ERATO, Adachi Molecular Exciton Engineering Project International Institute for Carbon Neutral Energy Research (WPI-I<sup>2</sup> CNER), Kyushu University
  • NAITO Hiroyoshi
    Department of Physics and Electronics, Osaka Prefecture University The Research Institute for Molecular Electronic Devices (RIMED)

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Description

Thermally activated delayed fluorescence (TADF) has attracted much attention for realization of highly-efficient and low-cost organic light emitting diodes (OLEDs). OLEDs based on 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN), which is one of highly-efficient TADF emitters, have been demonstrated to exhibit external quantum efficiency more than 19%. To study the decay rates from excited states of 4CzIPN, the temperature dependence of photoluminescence quantum efficiency (PLQE) has been measured in the weak photoexcitation limit in 4CzIPN-doped 1,3-bis(9-carbazolyl)benzene thin films. Characteristic features of the temperature dependence of PLQE in the weak photoexcitation limit are found, and examined by using rate equations of singlet and triplet densities.

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