Measurements of amplified spontaneous emission in π-conjugated polymer films with different morphology

Yuchen Wang; Xiao Yang; Ruizhi Wang; Chuanxiang Sheng

doi:10.1117/12.2067588

2 September 2014 Measurements of amplified spontaneous emission in π-conjugated polymer films with different morphology

Yuchen Wang, Xiao Yang, Ruizhi Wang, Chuanxiang Sheng

Proceedings Volume 9284, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronics Materials and Devices for Sensing and Imaging; 92840W (2014) https://doi.org/10.1117/12.2067588
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

π-conjugated polymers (PCPs) are attractive candidates as gain media in laser applications due to their high photoluminescence quantum efficiency in broad spectral range. However, the self-absorption of long-lived excited states was considered to be a limitation for achieving more effective organic lasers. Moreover, the morphology of films is found to be crucial to their optical and electrical properties recently. In this work, we studied amplified spontaneous emission (ASE) of a typical PCP, namely, Poly [2-methoxy-5-(2-ethylhexyloxy)-1, 4-phenylenevinylene] (MEH-PPV) films with a 10 ns 532 nm pulse laser focused by a cylindrical lens for obtaining an excitation area in the form of a 100 μm wide and 1 cm long stripe. In an as cast MEH-PPV film, the thresholds increase with the temperatures increase due to the thermal torsion and vibration mode shorten the conjugation chain. On the other hand, a MEH-PPV film which is annealed in Nitrogen at 350 K of half hour, the ASE is not observed at both 300 K and 77 K, for annealing will form π- stacks which increase the interchain interaction. Further analysis suggests that interchain excimers instead of intrachain excitons may be more primary to optical properties in annealed MEH-PPV film. Our measurements suggest that the morphology of the film instead of long lived photoexcitation with lifetime sensitive to the temperature is more crucial to threshold of ASE, as well as, to PCPs lasers.

Citation Download Citation

Yuchen Wang, Xiao Yang, Ruizhi Wang, and Chuanxiang Sheng "Measurements of amplified spontaneous emission in π-conjugated polymer films with different morphology", Proc. SPIE 9284, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronics Materials and Devices for Sensing and Imaging, 92840W (2 September 2014); https://doi.org/10.1117/12.2067588

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KEYWORDS

Annealing

Excitons

Polymers

Excimers

Polymer thin films

Absorption

Laser damage threshold

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