title: Synthesis of silica protected photoluminescence QDs and their applications for transparent fluorescent films with enhanced photochemical stability.
abstract: 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 Stöber method and fabricating the QD-PMAH-SiO(2)-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-SiO(2) 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-SiO(2) 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.
authors.affiliation: Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng, 475004, People’s Republic of China.
authors.forename: Changhua
authors.initials: C
authors.lastname: Zhou
authors.forename: Huaibin
authors.initials: H
authors.lastname: Shen
authors.forename: Hongzhe
authors.initials: H
authors.lastname: Wang
authors.forename: Weiwei
authors.initials: W
authors.lastname: Xu
authors.forename: Mao
authors.initials: M
authors.lastname: Mao
authors.forename: Sujuan
authors.initials: S
authors.lastname: Wang
authors.forename: Lin Song
authors.initials: LS
authors.lastname: Li