期刊
NANOTECHNOLOGY
卷 23, 期 42, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/23/42/425601
关键词
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资金
- Chinese Ministry of Education
- National Natural Science Foundation of China [21071041]
- Changjiang Scholars and Innovative Research Team in University [PCS IRT 1126]
In this paper, we have demonstrated a novel and simple way to prepare transparent composite fluorescent films by using poly (acrylic acid) co-polymer as a matrix and silica coated photoluminescence (PL) quantum dots (QDs) as light-emitting materials. The strategies include preparing aqueous amphiphilic oligomer (polymaleic acid n-hexadecanol ester, PMAH) modified QDs, encapsulating the aqueous QDs in silica with a modified Stober method and fabricating the QD-PMAH-SiO2-polymer composite fluorescent films with a spin-coating method. The obtained light-emitting thin films were transparent under room light and showed bright red, green and deep-blue light under the irradiation of UV light. The PL intensity of the composite films increased incrementally with the number of layers and the concentration of QD-PMAH-SiO2 within each film. A white light emitting film was also fabricated by combining the silica coated red, green and deep-blue QDs in a proper ratio. Moreover, the photochemical stability of the QD-PMAH-SiO2 in composite film was enhanced significantly compared with PMAH coated QDs, because of a thicker and compact passivating silica layer formed on the surfaces of the PL QDs.
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