100% fluorescence efficiency of 4, 4′ -bis[(N-carbazole)styryl] biphenyl in a solid film and the very low amplified spontaneous emission threshold

Takanori Aimono, Yuichiro Kawamura, Kenichi Goushi, Hidetoshi Yamamoto, Hiroyuki Sasabe, Chihaya Adachi

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

We examined the amplified spontaneous emission (ASE) characteristics of fluorescent styrylbenzene derivatives doped into a 4, 4′ -di(N-carbazolyl)biphenyl (CBP) host. In particular, 4, 4′ -bis[(N-carbazole)styryl]biphenyl (BSB-Cz) demonstrated an extremely low ASE threshold of Eth =0.32±0.05 μJ cm2. We observed that the 6 wt %-BSB-Cz:CBP film has an ultimate photoluminescence (PL) quantum efficiency of φPL =100% and a short transient lifetime of τf =1.0±0.1 ns, leading to a large radiative decay rate of kr =1× 109 s-1. We demonstrated that the extremely low ASE threshold originated from the large radiative decay rate of BSB-Cz.

Original languageEnglish
Article number071110
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume86
Issue number7
DOIs
Publication statusPublished - Feb 14 2005
Externally publishedYes

Fingerprint

carbazoles
spontaneous emission
fluorescence
decay rates
thresholds
photoluminescence
quantum efficiency
life (durability)

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

100% fluorescence efficiency of 4, 4′ -bis[(N-carbazole)styryl] biphenyl in a solid film and the very low amplified spontaneous emission threshold. / Aimono, Takanori; Kawamura, Yuichiro; Goushi, Kenichi; Yamamoto, Hidetoshi; Sasabe, Hiroyuki; Adachi, Chihaya.

In: Applied Physics Letters, Vol. 86, No. 7, 071110, 14.02.2005, p. 1-3.

Research output: Contribution to journalArticle

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AU - Aimono, Takanori

AU - Kawamura, Yuichiro

AU - Goushi, Kenichi

AU - Yamamoto, Hidetoshi

AU - Sasabe, Hiroyuki

AU - Adachi, Chihaya

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