[19a-C212-1~10] 12.4 Organic light-emitting devices and organic transistors

▼ [19a-C212-7] Continuous Wave Operation Based on Solution-Processable Organic Thin Film Lasers

〇(D)ADIKARIMUDIYANSELAGE CHATHURANGANIE SENEVIRATHNE¹, Van T. N. Mai², Atul Shukla², Ilene Allison², Hyunsoo Lim², Romain Lepage², Sarah K. McGregor², Michael Wood², Evan G. Moore², Elizabeth H. Krenske², Ebinazar B. Namdas², Shih-Chun Lo², Toshinori Matsushima^1,3, Atula S. D. Sandanayaka^1,3, Chihaya Adachi^1,3 (1.OPERA, Kyushu Univ., 2.COPE, Univ. of Queensland, Australia, 3.JST,ERATO)

Keywords:Organic semiconductor lasers, Distributed feedback resonators, Continuous wave operation

Novel fluorene-based semiconductors dyes, SFCz, BSFCz, and BSTFCz (Fig. 1a) which showed excellent photophysical properties were investigated in terms of their amplified spontaneous emission (ASE) and surface emission laser thresholds using a mixed-order or second-order distributed feedback resonator structure, and under continuous-wave (CW) regime. Films of SFCz, BSFCz, and BSTFCz, which were blended with tris(4-carbazoyl-9-ylphenyl)amine (TCTA) at 6 wt.%, showed photoluminescence quantum yield values of 71, 76, and 80%, respectively. The radiative decay constants of these films were in the range of 10⁹ s^-1. The lowest ASE threshold of 0.7 µJ cm^-2 and surface emission laser threshold of 0.5 µJ cm^-2 were obtained from a BSTFCz based device. Among these dyes, BSFCz exhibited CW lasing profiles with good stability up to 10 ms (Figs. 1b and 1c). To the best of our knowledge, this is the first ever demonstration of solution processable organic lasers which work under CW regime¹.
1. A. S. D. Sandanayaka et al. Sci. Adv. 2017, 3, e1602570.