We present time-resolved photoluminescence measurements on a range of poly- and oligofluorenes with different molecular weights in both dilute solution and thin films. The commonly observed parasitic broad green emission band, which has previously been attributed to an excimer, is identified in all solution and film samples and assigned to an on-chain emissive defect. By comparison of the luminescence decay in the solid state at different temperatures it is shown that, at room temperature, intramolecular relaxation is faster in these polyphenylenes than intermolecular exciton diffusion.

1.
M. Pope and C. E. Swenberg, Electronic Processes in Organic Crystals and Polymers, 2nd ed. (Oxford University Press, Oxford, U.K., 1999).
2.
I. D. W. Samuel, G. Rumbles, and R. H. Friend, in Primary Photoexcitations in Conjugated Polymers: Molecular Exciton Versus Semiconductor Band Model, edited by N. S. Sariciftci (World Scientific, Singapore, 1997).
3.
A. W.
Grice
,
D. D. C.
Bradley
,
M. T.
Bernius
,
M.
Inbasekaran
,
W. W.
Wu
, and
E. P.
Woo
,
Appl. Phys. Lett.
73
,
629
(
1998
).
Google Scholar
 
4.
V. N.
Bliznyuk
,
S. A.
Carter
,
J. C.
Scott
,
G.
Klärner
,
R. D.
Miller
, and
D. C.
Miller
,
Macromolecules
32
,
361
(
1999
).
Google Scholar
 
5.
M.
Gross
,
D. C.
Müller
,
H. G.
Nothofer
,
U.
Scherf
,
D.
Neher
,
C.
Bräuchle
, and
K.
Meerholz
,
Nature (London)
405
,
661
(
2000
).
Google Scholar
 
6.
D.
Sainova
,
T.
Miteva
,
H. G.
Nothofer
,
U.
Scherf
,
I.
Glowacki
,
J.
Ulanski
,
H.
Fujikawa
, and
D.
Neher
,
Appl. Phys. Lett.
76
,
1810
(
2000
).
Google Scholar
 
7.
K. H.
Weinfurtner
,
H.
Fujikawa
,
S.
Tokito
, and
Y.
Taga
,
Appl. Phys. Lett.
76
,
2502
(
2000
).
Google Scholar
 
8.
Y.
Yang
and
Q.
Pei
,
Appl. Phys. Lett.
79
,
629
(
1996
).
Google Scholar
 
9.
M.
Grell
,
D. D. C.
Bradley
,
G.
Ungar
,
J.
Hill
, and
K. S.
Whitehead
,
Macromolecules
32
,
5810
(
1999
).
Google Scholar
 
10.
C. J.
Xia
and
R. C.
Advincula
,
Macromolecules
34
,
5854
(
2001
).
Google Scholar
 
11.
T.
Miteva
,
A.
Meisel
,
W.
Knoll
,
H. G.
Nothofer
,
U.
Scherf
,
D. C.
Müller
,
K.
Meerholz
,
A.
Yasuda
, and
D.
Neher
,
Adv. Mater.
13
,
565
(
2001
).
Google Scholar
 
12.
S.
Setayesh
,
A. C.
Grimsdale
,
T.
Weil
,
V.
Enkelmann
,
K.
Müllen
,
F.
Meghdadi
,
E. J. W.
List
, and
G.
Leising
,
J. Am. Chem. Soc.
123
,
946
(
2001
).
Google Scholar
 
13.
L. M.
Herz
and
R. T.
Phillips
,
Phys. Rev. B
61
,
13691
(
2000
).
Google Scholar
 
14.
L. M.
Herz
,
C.
Silva
,
R. T.
Phillips
,
S.
Setayesh
, and
K.
Müllen
,
Chem. Phys. Lett.
347
,
318
(
2001
).
Google Scholar
 
15.
E. J. W.
List
,
R.
Guentner
,
P. Scanducci
de Freitas
, and
U.
Scherf
,
Adv. Mater.
14
,
374
(
2002
).
Google Scholar
 
16.
J. I.
Lee
,
G.
Klaerner
, and
R. D.
Miller
,
Chem. Mater.
11
,
1083
(
1999
).
Google Scholar
 
17.
M.
Yan
,
L. J.
Rothberg
,
F.
Papadimitrakopoulos
,
M. E.
Galvin
, and
T. M.
Miller
,
Phys. Rev. Lett.
73
,
744
(
1994
).
Google Scholar
 
18.
J. M.
Lupton
,
Appl. Phys. Lett.
80
,
186
(
2002
).
Google Scholar
 
19.
T. Q.
Nguyen
,
J. J.
Wu
,
V.
Doan
,
B. J.
Schwartz
, and
S. H.
Tolbert
,
Science
288
,
652
(
2000
).
Google Scholar
 
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