Measurements of photoluminescence yield over a wide range of excitation power in rubrene single crystals reveal a transition between a low-yield region and a region with a yield more than an order of magnitude larger. This transition occurs at an excitation density of 3 × 1020 cm−3 absorbed photons per second. This power dependence is predicted in case of an extremely efficient conversion between singlet and triplet excitons through fission and fusion. Triplet fusion starts contributing to rubrene's photoluminescence already at intensities of a few mW/cm2 at room temperature, corresponding to triplet densities of ∼1016 cm−3.
REFERENCES
1.
M.
Pope
and C.
Swenberg
, Electronic processes in organic crystals and polymers
,” Monographs on the Physics and Chemistry of Materials (Oxford University Press
, 1999
).2.
J. L.
Hall
, D. A.
Jennings
, and R. M.
McClintock
, Phys. Rev. Lett.
11
, 364
(1963
).3.
R. G.
Kepler
, J. C.
Caris
, P.
Avakian
, and E.
Abramson
, Phys. Rev. Lett.
10
, 400
(1963
).4.
A.
Ryasnyanskiy
and I.
Biaggio
, Phys. Rev. B
84
, 193203
(2011
).5.
V.
Podzorov
, V.
Pudalov
, and M.
Gershenson
, Appl. Phys. Lett.
82
, 1739
(2003
).6.
V.
Podzorov
, E.
Menard
, A.
Borissov
, V.
Kiryukhin
, J. A.
Rogers
, and M. E.
Gershenson
, Phys. Rev. Lett.
93
, 086602
(2004
).7.
V.
Podzorov
and M.
Gershenson
, Phys. Rev. Lett.
95
, 016602
(2005
).8.
V. C.
Sundar
, J.
Zaumseil
, V.
Podzorov
, E.
Menard
, R. L.
Willett
, T.
Someya
, M. E.
Gershenson
, and J. A.
Rogers
, Science
303
, 1644
(2004
).9.
H.
Najafov
, I.
Biaggio
, V.
Podzorov
, M. F.
Calhoun
, and M. E.
Gershenson
, Phys. Rev. Lett.
96
, 056604
(2006
).10.
H.
Najafov
, B.
Lyu
, I.
Biaggio
, and V.
Podzorov
, Phys. Rev. B
77
, 125202
(2008
).11.
H.
Najafov
, B.
Lyu
, I.
Biaggio
, and V.
Podzorov
, Appl. Phys. Lett.
96
, 183302
(2010
).12.
I.
Biaggio
, in Handbook of Organic Materials for Optical and (Opto)Electronic Devices: Properties and Applications
, edited by O.
Ostroverkhova
(Woodhead Publishing
, 2013
) Chap. 12, pp. 356
–376
.13.
P.
Irkhin
and I.
Biaggio
, Phys. Rev. Lett.
107
, 017402
(2011
).14.
P.
Irkhin
, A.
Ryasnyanskiy
, M.
Koehler
, and I.
Biaggio
, Phys. Rev. B
86
, 085143
(2012
).15.
L.
Ma
, K.
Zhang
, C.
Kloc
, H.
Sun
, M. E.
Michel-Beyerle
, and G. G.
Gurzadyan
, Phys. Chem. Chem. Phys.
14
, 8307
(2012
).16.
V.
Ern
, J.
Saint-Clair
, M.
Schott
, and G.
Delacote
, Chem. Phys. Lett.
10
, 287
(1971
).17.
R.
de Boer
, M.
Gershenson
, A.
Morpurgo
, and V.
Podzorov
, Phys. Status Solidi A
201
, 1302
(2004
).© 2013 AIP Publishing LLC.
2013
AIP Publishing LLC
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