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

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±0.05μJ∕cm2. We ob...

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Veröffentlicht in:	Applied physics letters 2005-02, Vol.86 (7)
Hauptverfasser:	Aimono, Takanori, Kawamura, Yuichiro, Goushi, Kenichi, Yamamoto, Hidetoshi, Sasabe, Hiroyuki, Adachi, Chihaya
Format:	Artikel
Sprache:	eng
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Zusammenfassung:	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±0.05μJ∕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±0.1ns, leading to a large radiative decay rate of kr=1×109s−1. We demonstrated that the extremely low ASE threshold originated from the large radiative decay rate of BSB-Cz.
ISSN:	0003-6951 1077-3118
DOI:	10.1063/1.1867555