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Gain Properties and Distributed Feedback Laser Performance of 7F6/Poly(Styrene) Blend Films: Potential Core Material for Plastic Optical Fiber Expanding the Bandwidth to Visible Region

Abstract

Optical gain properties of blue emission oligomer 7‐unit 9,9‐dihexylfluorene (7F6) and its blends with polystyrene (PS) are reported. 7F6 demonstrates high photoluminescence quantum yield (65%), low amplified spontaneous emission threshold (EthASE = 0.6 kW cm−2), high gain coefficient (g = 90.9 cm−1), and extremely low distributed feedback laser threshold (Ethlaser = 86 W cm−2). Unlike polymer gain materials, the phase separation between 7F6 and PS is small even in a high blending ratio. The 70 and 50 wt% 7F6/PS blends display excellent gain properties with g = 70.7 and 64.3 cm−1, EthASE = 1.1 and 2.1 kW cm−2, and Ethlaser = 0.3 and 0.41 kW cm−2, respectively. The photostability and thermal stability are improved significantly by blending 7F6 into PS. These results promise 7F6/PS blends as a potential core material for expanding the bandwidth of plastic optical fiber.

7‐unit 9,9‐dihexylfluorene (7F6), exhibits excellent optical gain properties. Very weak phase separation is observed from 50–70 wt% 7F6 doped polystyrene (PS). High gain and low laser threshold of the 7F6/PS, together with improved photo and thermal stabilities, demonstrate 7F6 as a promising core material for plastic optical fibers, to expand the bandwidth to the visible region.

Authors:   Kang Zhang, Qi Zhang, Haoran Zhang, Jianping Shen, Qiaoli Niu, Ruidong Xia
Journal:   Macromolecular Chemistry and Physics
Year:   2018
Pages:   n/a
DOI:   10.1002/macp.201700527
Publication date:   17-Jan-2018
Facts, background information, dossiers
  • thermal stability
  • styrene
  • photoluminescence
  • optical fibers
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