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

Journal Article · Mon May 26 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4878397· OSTI ID:22300154

Niwa, Akitsugu ^[1]; Kobayashi, Takashi; Nagase, Takashi; Naito, Hiroyoshi ^[1]; Goushi, Kenichi; Adachi, Chihaya ^[2]

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1. Department of Physics and Electronics, Osaka Prefecture University, 1-1 Gakuencho, Nakaku, Sakai 599-8531 (Japan)
2. Center for Organic Photonics and Electronics Research, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395 (Japan)

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.

• OSTI ID: 22300154
• Journal Information: Applied Physics Letters, Vol. 104, Issue 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNIHILATION
BENZENE
ENERGY GAP
EXCITED STATES
FLUORESCENCE
PHOTOLUMINESCENCE
QUANTUM EFFICIENCY
SPECTROSCOPY
STEADY-STATE CONDITIONS
TEMPERATURE DEPENDENCE
THIN FILMS
TIME RESOLUTION