[7a-A203-1~12] 12.4 Organic light-emitting devices and organic transistors

[7a-A203-1] Gain-narrowing in a light-emitting organic field-effect transistor

〇Hidekazu Shimotani¹, Thangavel Kanagasekaran², Keiichiro Kasai¹, Shun Onuki¹, Katsumi Tanigaki^1,2 (1.Dept. Phys., Tohoku Univ., 2.AIMR, Tohoku Univ.)

Keywords:organic field-effect transistor, luminescence

One of the big challenge left for organic electronics is realization of current-induced semiconductor lasers. Thanks to the variety of organic semiconductors, lasers of any wavelength will be available if the target is achieved. However, low carrier mobilities in organic semiconductors prevent sufficient accumulations of excited molecule in organic semiconductors. To solve the problem, several device structures have been proposed and single-crystalline organic field-effect transistors are believed to be one of the most promising devices to realize current-induced laser. In the transistor, two electrodes on a single-crystalline organic semiconductor are negatively and positively biased with respect to the gate electrode, and electron- and hole-channels are formed in regions of semiconductor, which are close to the two electrodes, respectively. Electrons and holes injected to the channels are recombined in the semiconductor and emit light. Many researchers[1] have been tried to enhance a current density and a luminescent efficiency to realize a laser including our group. [2] However, there has been no report of laser oscillation so far. Here, we report a gain-narrowing, which indicate amplification of light, in field-effect transistors in a single-crystalline organic semiconductor, and compare it with gain-narrowing properties of their photoluminescence spectra.
References
[1] S. Z. Bisri C. Piliego, J. Gao, M. A. Loi, Adv. Mater. 26, 1176-1199 (2014).
[2] H. Shang, H. Shimotani, S. Ikeda, T. Kanagasekaran, K. Oniwa, T. Jin, N. Asao, Y. Yamamoto, H. Tamura, K. Abe, M. Kanno, M. Yoshizawa,K. Tanigaki, J. Phys. Chem. C 121, 2364–2368, (2017); T. Kanagasekaran, H. Shimotani, S. Ikeda, H. Shang, R. Kumashiro, K. Tanigaki, Appl. Phys. Lett. 107, 043304 (2015); K. Oniwa, T. Kanagasekaran, T. Jin, Md. Akhtaruzzaman, Y. Yamamoto, H. Tamura, I. Hamada, H. Shimotani, N. Asao, S. Ikeda, K. Tanigaki, J. Mater. Chem. C 1, 4163-4170 (2013).