Abstract
Organic semiconductor lasers were fabricated by UV-nanoimprint lithography with thresholds as low as 57 W/cm(2) under 4 ns pulsed operation. The nanoimprinted lasers employed mixed-order distributed feedback resonators, with second-order gratings surrounded by first-order gratings, combined with a light-emitting conjugated polymer. They were pumped by InGaN LEDs to produce green-emitting lasers, with thresholds of 208 W/cm(2) (102 nJ/pulse). These hybrid lasers incorporate a scalable UV-nanoimprint lithography process, compatible with high-performance LEDs, therefore we have demonstrated a coherent, compact, low-cost light source.
Highlights
Organic semiconductor lasers are compact visible sources which combine solution processability and wavelength tunability [1]
These hybrid lasers incorporate a scalable UV-nanoimprint lithography process, compatible with high-performance light emitting diodes (LEDs), therefore we have demonstrated a coherent, compact, low-cost light source
The very simple fabrication in combination with the low threshold and especially the possibility of light emitting diodes (LEDs) pumping is very important as it paves the way to low-cost tunable visible lasers
Summary
Organic semiconductor lasers are compact visible sources which combine solution processability and wavelength tunability [1]. Distributed feedback (DFB) periodic structures play a very important role in these high performance organic semiconductor lasers [1] Simple techniques such as solventassisted micro-molding [15], two-beam holography [16] and nanoimprinted lithography (NIL) [17,18,19,20] are used to introduce periodic corrugations, on either the organic gain medium or substrate. Among these patterning methods, NIL provides parallel processing with a high throughput, leading to low cost fabrication of large-area nano-structures (with resolution down to a few tens of nanometres) on various types of substrates [21, 22]. We use mixed-order DFB gratings [7], a composite structure with mixed orders allowing extremely low laser threshold with surface emission, which are capable of being pumped by inorganic LEDs reliably and routinely
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