Multiple-wavelength distributed-feedback lasers are made from multilayered composites by utilizing the solution-processing ease of cadmium selenide semiconductor nanocrystals and soft lithography. The Figure shows three types of emission obtained from such structures across a wide range of the visible spectrum: fluorescence (dotted lines), amplified spontaneous emission (dashed lines), and feedback-induced lasing (solid lines).
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Sundar et al. (2004) studied this question.
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