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Broadly tunable deep blue laser based on a star-shaped oligofluorene truxene

Wang, Yue and Tsiminis, Georgios and Yang, Ying and Ruseckas, Arvydas and Kanibolotsky, Alexander L. and Perepichka, Igor F. and Skabara, Peter and Turnbull, Graham A. and Samuel, Ifor D. W. (2010) Broadly tunable deep blue laser based on a star-shaped oligofluorene truxene. Synthetic Metals, 160 (13-14). pp. 1397-1400. ISSN 0379-6779

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We report amplified spontaneous emission (ASE) and optically pumped deep-blue-emitting distributed feedback (DFB) lasers based on a star-shaped oligofluorene truxene molecule. A low ASE threshold of 2.1 kW/cm(2) at 439 nm was achieved. The material exhibits a high net gain of 38 cm(-1) and also low optical loss coefficient of 3.5 cm(-1). Second-order DFB lasers show tuning of the emission wavelength from 422 to 473 nm, and a minimum threshold density of 515 W/cm(2). This is the broadest tuning range (51 nm) reported for organic deep-blue/blue lasing materials. (C) 2010 Elsevier B.V. All rights reserved.