Takenobu Taishi, Bisri Satria Zulkarnaen, Takahashi Tetsuo, Yahiro Masayuki, Adachi Chihaya, Iwasa Yoshihiro
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
Phys Rev Lett. 2008 Feb 15;100(6):066601. doi: 10.1103/PhysRevLett.100.066601. Epub 2008 Feb 13.
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.
我们测量了由有机单晶制成的发光场效应晶体管（LETs）的外部电致发光量子效率（eta(ext)），发现在双极性传输区域，eta(ext)在高达数百A/cm(2)的电流密度范围内不会降低，这比传统有机发光二极管实现的电流密度范围大2个数量级。目前的结果表明，单晶有机LET是一种有前景的器件结构，它不存在各种非辐射损耗，如电极附近的激子解离和激子湮灭。
