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Low-threshold blue-emitting monolithic polymer vertical cavity surface-emitting lasers

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6 Author(s)
Persano, Luana ; National Nanotechnology Laboratory of INFM-CNR, c/o Palazzine Garrisi, Università degli Studi di Lecce, via Arnesano, I-73100 Lecce, Italy ; Camposeo, Andrea ; Del Carro, Pompilio ; Mele, Elisa
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The authors report on a monolithic vertical microcavity blue laser with a carbazole/fluorenyl derivative copolymer active film. The laser is realized by electron-beam deposition of the two dielectric mirrors on the bottom and on the top of the polymeric active layer. The devices exhibit a threshold fluence as low as 1.2 μJ/cm2, with a divergence of the emission beam of 2.8°. The measured lasing threshold and operational lifetimes (≫1.5×104 pulses at an excitation density 500 times larger than threshold) are among the best so far reported for blue-emitting polymer lasers, thus making these devices promising candidates for future electrical excitation.

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Applied Physics Letters  (Volume:89 ,  Issue: 12 )