Optically Anisotropic Films of Colloidal Nanocrystals/Photoluminescent Dye Doped Polymers

Z. Dikmen
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Abstract

Semiconductor colloidal nanocrystals are attractive materials since they can be adapted to polymers to form hybrid materials and are compatible with many optical applications. Here, synthesis of CdSe/CdS nanorods (NRs) via hot injection method is carried out, followed by preparation of hybrid polymer films from polyethylene glycol monomethyl ether-block-poly(glycidyl methacrylate)-block-poly[2-(diethylamino)ethyl methacrylate] triblock copolymer (MPEG-b-PGMA-b-DEAEMA) at a liquid-air interface. The optical properties of the films are finely adjusted to form optically anisotropic (i.e. dual-color emissive) films by using dyes for the other emitter as desired. Thiazolo[5,4-d] thiazole (TTz)-based dye and 6-carboxy fluorescein were used for this purpose. Tunable emission of TTz dye from blue to green dependent on changing pH value resulted in blue-green emissive polymer films, while red emission of CdSe/CdS NRs caused red emissive films. Phase separation of these materials is achieved by the hexane-insoluble nature of MPEG-b-PGMA-b-DEAEMA and the high solubility of NRs in it. These dual emissive films are promising candidates for waveguides and optical sensors.
各向异性胶体纳米晶体/掺杂染料的光致发光聚合物薄膜
半导体胶体纳米晶体是一种极具吸引力的材料,因为它们可以与聚合物结合形成杂化材料,并且与许多光学应用兼容。本文通过热注入法合成了镉硒/镉硒纳米棒(NRs),然后在液气界面上用聚乙二醇单甲醚-嵌段-聚(甲基丙烯酸缩水甘油酯)-嵌段-聚[2-(二乙胺基)甲基丙烯酸乙酯]三嵌段共聚物(MPEG-b-PGMA-b-DEAEMA)制备了杂化聚合物薄膜。通过对薄膜的光学特性进行微调,可形成光学各向异性(即双色发射)薄膜,方法是根据需要为另一种发射体使用染料。噻唑并[5,4-d]噻唑(TTz)染料和 6-羧基荧光素被用于此目的。根据 pH 值的变化,TTz 染料从蓝色到绿色的可调发射产生了蓝绿色发射聚合物薄膜,而 CdSe/CdS NRs 的红色发射则产生了红色发射薄膜。MPEG-b-PGMA-b-DEAEMA 的正己烷不溶性和 NRs 在其中的高溶解性实现了这些材料的相分离。这些双发射薄膜有望用于波导和光学传感器。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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