Temperature dependence of photoluminescence properties in a thermally activated delayed fluorescence emitter

Akitsugu Niwa, Takashi Kobayashi, Takashi Nagase, Kenichi Goshi, Chihaya Adachi, Hiroyoshi Naito

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Using steady-state and time-resolved photoluminescence (PL) spectroscopy, we have investigated the temperature dependence of PL properties of 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyano-benzene (4CzIPN), which have a small energy gap between its singlet and triplet excited states and thus exhibits efficient thermally activated delayed fluorescence [H. Uoyama et al., Nature 492, 235 (2012)]. Below around 100 K, PL quantum efficiency of 4CzIPN thin films is largely suppressed and strong photoexcitation intensity dependence appears. These features can be explained by using rate equations for the densities of singlet and triplet excited states considering a triplet-triplet annihilation process.

Original languageEnglish
Article number213303
JournalApplied Physics Letters
Volume104
Issue number21
DOIs
Publication statusPublished - May 26 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Temperature dependence of photoluminescence properties in a thermally activated delayed fluorescence emitter'. Together they form a unique fingerprint.

  • Cite this