Low threshold blue conjugated polymer lasers with first- and second-order distributed feedback

C. Karnutsch, C. Gýrtner, V. Haug, U. Lemmer, T. Farrell, B. S. Nehls, U. Scherf, J. Wang, T. Weimann, G. Heliotis, C. Pflumm, J. C. Demello, D. D.C. Bradley

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We report on the fabrication of low threshold distributed feedback (DFB) polymer lasers based on a polyfluorene derivative containing statistical binaphthyl units (BN-PFO). First- and second-order feedback lasers have been realized. The emission was tuned in the wavelength range from 438 to 459 nm by varying the grating period and the film thickness. A threshold energy of 280 pJ /pulse was observed in second-order DFB structures, which could be further reduced to 160 pJ /pulse by employing first-order feedback in electron beam lithographically patterned structures with a period of 140 nm. In these first-order structures, laser oscillation at both edges of the photonic stop band was observed. These very low threshold values render BN-PFO a very promising material for future electrically pumped organic semiconductor laser diodes. © 2006 American Institute of Physics.
Original languageEnglish (US)
JournalApplied Physics Letters
Issue number20
StatePublished - Nov 23 2006
Externally publishedYes

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