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PMMA quantum dots composites fabricated via use of pre-polymerization

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Abstract

We present a novel method to produce a PMMA-quantum-dot (QD) composite fabricated by pre-polymerization of PMMA and dispersing commercially available colloidal semiconductor QDs. The QDs are stabilized in rapidly formed oligomer matrices, and the complete polymerization of the PMMA-QD composite is achieved by commonly used polymerization. The properties of the PMMA-QD composite are measured and compared with the QDs in colloidal solution. Patterning of the PMMA-QD composite by direct write electron beam shows its promising applications in optoelectronics.

©2005 Optical Society of America

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Figures (3)

Fig. 1.
Fig. 1. Comparison of the pre-polymerazation of MMA-QDs composite and the direct polymerization; (a) top veiw of the pre-polymerization (right) and direct polymerization (left); the close-up of the top surface of the direct polymerization was taken under a background; (b) sideviews of the pre-polymerization (right) and direct polymerization (left); the latter shows nonuniformity in the vertical direction.
Fig. 2.
Fig. 2. Absorption and PL spectra of QDs in (a) toluene solution and (b) PMMA-QD composite, where the dash line shows the absorption spectrum of a 1 mm thick pure PMMA slide.
Fig. 3.
Fig. 3. Scanning electron microscopy image of PMMA-QD composite structure by directly patterning the composite with electron beam; (a) a composite grating with 1.5 µm period and features of 200 and 300nm, (b) magnified view of (a).
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