Browsing by Author "Sadeghi, S."

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    ArticlePublicationOpen Access
    Colloidal aluminum antimonide quantum dots
    (American Chemical Society, 2019-07-09) Jalali, H. B.; Sadeghi, S.; Şahin, M.; Öztürk, Hande; Ow-Yang, C. W.; Nizamoglu, S.; Mechanical Engineering; KAYMAKSÜT, Hande Öztürk
    AlSb is a less studied member of the III–V semiconductor family, and herein, we report the colloidal synthesis of AlSb quantum dots (QDs) for the first time. Different sizes of colloidal AlSb QDs (5 to 9 nm) were produced by the controlled reaction of AlCl3 and Sb[N(Si(Me)3)2]3 in the presence of superhydride. These colloidal AlSb quantum dots showed excitonic transitions in the UV-A region and a tunable band-edge emission (quantum yield of up to 18%) in the blue spectral range. Among all III–V quantum dots, these quantum dots show the brightest core emission in the blue spectral region.
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    High quality quantum dots polymeric films as color converters for smart phone display technology
    (IOP Publishing, 2019-03) Sadeghi, S.; Mutcu, Süleyman Efdal; Srivastava, S. B.; Aydindogan, G.; Caynak, S.; Karsli, K.; Melikov, R.; Nizamoglu, S.; Mutcu, Süleyman Efdal
    Quantum dots (QDs) have high potential to fulfill the ever-increasing demands for high-quality displays due to their outstanding size-tunable optical properties, high quantum yield and reduced costs. The synthesis of efficient materials and their integration in uniform and thin polymeric films are necessary for displays. In this study, we synthesized red-and green-emitting Cd-based QDs with quantum yields of 52% and 74%, respectively. Weincorporated quantum dots into the polydimethylsiloxane (PDMS) polymer matrix by using doctor blade technique, which led to polymeric films with 123 mm x 68 mm dimensions for smart phone displays. We fabricated QD-polymeric films having thickness ranging from 100 to 500 mu m to investigate their color conversion and display application performances. By using the large-area QD-polymeric films on blue-emitting backlight unit, the NTSC and sRGB color gamut ratio was measured as 91% and 127%, respectively. Therefore, QD polymeric films show promise for smart phone applications.