各向异性胶体纳米晶体/掺杂染料的光致发光聚合物薄膜

Z. Dikmen
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引用次数: 0

摘要

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。
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Optically Anisotropic Films of Colloidal Nanocrystals/Photoluminescent Dye Doped Polymers
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.
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