Abstract
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/cm2 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/cm2. This is the broadest tuning range (51 nm) reported for organic deep-blue/blue lasing materials.
Original language | English |
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Pages (from-to) | 1397-1400 |
Number of pages | 4 |
Journal | SYNTHETIC METALS |
Volume | 160 |
Issue number | 13-14 |
DOIs | |
Publication status | Published - 1 Jul 2010 |
Keywords
- Amplified spontaneous emission
- Distributed feedback
- Fluorene
- Oligomers
- Organic semiconductor