Abstract
We report on the demonstration of liquid organic dye lasers based on 9-(2-ethylhexyl)carbazole (EHCz), so-called liquid carbazole, doped with green- and red-emitting laser dyes. Both waveguide and Fabry-Perot type microcavity fluidic organic dye lasers were prepared by capillary action under solvent-free conditions. Cascade Förster-type energy transfer processes from liquid carbazole to laser dyes were employed to achieve color-variable amplified spontaneous emission and lasing. Overall, this study provides the first step towards the development of solvent-free fluidic organic semiconducting lasers and demonstrates a new kind of optoelectronic applications for liquid organic semiconductors.
Highlights
In recent years, liquid organic semiconductors have emerged as a promising class of materials for organic optoelectronics [1,2,3]
We report on the demonstration of liquid organic dye lasers based on 9-(2-ethylhexyl)carbazole (EHCz), so-called liquid carbazole, doped with green- and red-emitting laser dyes
We examined the amplified spontaneous emission and lasing properties of the liquid carbazole EHCz blended with the laser dyes Coumarin 153 and DCM
Summary
Liquid organic semiconductors have emerged as a promising class of materials for organic optoelectronics [1,2,3]. Microfluidic OLEDs were recently reported in which fresh liquid organic semiconductors could be continuously supplied to the emitting layer [7] Such a convectional circulation of a liquid organic semiconducting material can be applied to the development of degradation-free organic optoelectronic devices. Over the past few years, optofluidic dye lasers have gained interest as miniature coherent light sources for integrated optics and lab-on-a-chip applications [10] These devices have been shown to be very promising for high sensitivity chemical and biosensing [11]. Previous work has shown that EHCz, so-called liquid carbazole, is liquid at room temperature with a glass transition temperature well below 0°C [1] This liquid organic semiconductor is a blue fluorescent emitter, exhibits good hole transport properties and has been successfully used as a liquid hole transport matrix for rubrene in OLEDs [5] and silver nanoparticles in bistable memories [9]. The possibility to integrate liquid organic semiconductors with tunable optoelectronic properties into solvent-free optofluidic devices opens new alternatives for the generation of liquid organic optoelectronic devices
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