The surface modification strategy is widely used to solve the problems of low stability, agglomeration, surface oxidation and photoluminescence quenching of quantum dots (QDs) in practical applications. However this method can easily destroys the surface ligands of QDs, increases defects even leads to a huge loss of fluorescence. In order to improve the stability of QDs, a new synthesis method of QD-silica hybrid nanospheres was proposed in this study. These QD-silica hybrid nanospheres are characterized by using mesoporous silica spheres (MSSs) as template, adsorbing QDs as one shell, and then coating a silica layer as another shell (named SQS). The template MSSs were functionalized by (3-mercaptopropyl) trimethoxysilane (MPTMS) in order to connect MSSs and QDs. After that, the QD-adsorbed silica spheres were coated with silica as the encapsulation layer by Stober method. The structure and morphology of SQS were analyzed by TEM. The effects of different contents of MPTMS and tetraethoxysilane(TEOS) were experimentally compared. Finally, it was found that the optimal contents of MPTMS and TEOS was 250μL and 1.5mL, respectively. The luminescence intensity of SQS samples could reach 2 times higher than that of pure QD solution. Meanwhile, SQS hybrid nanospheres could avoid the tiny spots inside the microstructure caused by QD aggregation and play a better role in dispersion.
Quantum dots (QDs) exhibit exceptional optical qualities, including wide excitation wavelength, small full width at half maximum (FWHM), and photobleaching resistance. It had been used to make color-converting diffusers for backlight modules. In this study, the QDs were added into masterbatches to prepare composite components with the functions of diffusion and color conversion. Using a coextrusion approach, masterbatches were made by adding suitable ratio of red and green QDs as color conversion materials in polystyrene (PS), silicone difussion powder as the light diffusing agent, and adding antioxidants to improve the service life of the masterbatch. After that, the QD color masterbatch with uniform dispersion, controllable concentration and good luminescence performance was obtained. A spectrometer was used to examine the photoluminescence performance of the created masterbatches in order to validate their luminescence performance. As a result, the use of QDs masterbatches is a viable option for the application of high performance QD display device.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.