Abstract
A well-known red fluorescent dye 4-(dicy-anomethylene)-2-t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) was codoped with an electron transport organic molecule tris(8-hydroxyquinoline) aluminum in a host matrix of polystyrene (PS), and the amplified spontaneous emission (ASE) was studied by optically pumping. It was found that the ASE performance was significantly improved by the introduction of . The blending thin films showed a low threshold and a high net gain coefficient compared with the pure DCJTB:PS system (threshold of and gain of ). The improvement of the ASE performance was considered to be attributable to the effective Föster energy transfer from to DCJTB. Our results demonstrate that the :DCJTB could be a promising candidate as gain medium for red organic diode lasers.
© 2007 Optical Society of America
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