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Optical Amplification at 637 and 1067 nm Based on Organic Molecule AQ(PhDPA) 2 and Nd III Complex Codoped Polymer Waveguides.

Yuyang HuangYi ManGuohua XieCe WangBaoping ZhangHui XuHongyan FuJiyun ZhuZiyue LvLeiying YingFeng XiaDan Zhang
Published in: Small methods (2023)
Based on the molecular energy transfer mechanism, relative gains at 1067 and 637 nm wavelengths are achieved in thermally activated delayed fluorescence molecule AQ(PhDPA) 2 and Nd complex with chelating phosphine oxide as ligands codoped polymer waveguides, with the excitation of low-power UV light-emitting diodes (LEDs) instead of traditional semiconductor lasers as pump sources. For AQ(PhDPA) 2 -Nd(DBTTA) 3 (DBFDPO) (DBTTA = dibenzotetrathienoacene, DBFDPO = 4,6-bis (diphenylphosphoryl) dibenzofuran) -codoped polymethylmethacrylate (PMMA), and AQ(PhDPA) 2 -Nd(DBTTA) 3 (FDPO) (FDPO = 9,9-bis (diphenylphosphorylphenyl) fluorene)-codoped PMMA polymers with a mass ratio of 1:4 respectively, when they are spin-coated as upper claddings, the relative gains of 2.2 and 1.8 dB cm -1 at 1067 nm are obtained in evanescent-field waveguides with cross-section of 4 × 8 µm 2 under excitation of 300 mW 405 nm LED, and the gains of 3.9 and 4.9 dB cm -1 at 637 nm are achieved with pumping of 530 mW 450 nm LED respectively. By growing a 100 nm-thick aluminum reflector with the waveguides, the optical gain at 1067 and 637 nm can be enhanced to 3.5 and 6.1 dB cm -1 , corresponding to AQ(PhDPA) 2 -Nd(DBTTA) 3 (DBFDPO) and AQ(PhDPA) 2 -Nd(DBTTA) 3 (FDPO)-codoped PMMA polymers, respectively.
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