High current density in light-emitting transistors of organic single crystals.
We measured the external electroluminescence quantum efficiency (eta(ext)) in light-emitting field-effect transistors (LETs) made of organic single crystals and found that, in the ambipolar transport region, eta(ext) is not degraded up to several hundreds A/cm(2) current-density range, which is 2 orders of magnitude larger than that achieved in conventional organic light-emitting diodes. The present result indicates the single-crystal organic LET is a promising device structure that is free from various kinds of nonradiative losses such as exciton dissociation near electrodes and exciton annihilations.
Takenobu
Taishi
T
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan. takenobu@imr.tohoku.ac.jp
Bisri
Satria Zulkarnaen
SZ
Takahashi
Tetsuo
T
Yahiro
Masayuki
M
Adachi
Chihaya
C
Iwasa
Yoshihiro
Y