Abstract
A functional lens coating, based on the structure of inversed colloidal photonic crystals, is proposed. The color-reflecting colloidal crystal was first prepared by self-assembly of nano-colloids and was infiltrated by adhesive polymer solution. As the polymer was crosslinked and the crystal array was removed, a robust mesh-like coating was achieved. Such a functional coating has good transmittance and has a shielding efficiency of ~9% for UV–blue light according to different particle sizes of the nano-colloids, making it an ideal functional material.
Highlights
IntroductionMicro scale [1,2], and are endowed with photonic bandgap (PBG) properties due to the periodic arrangement of dielectric materials [3,4]
Photonic crystals (PC), with a uniform structure, maintain long-range order at the nano–micro scale [1,2], and are endowed with photonic bandgap (PBG) properties due to the periodic arrangement of dielectric materials [3,4]
We initially designed two other facile routes, one of which was to mix the PS crystalline suspension with poly(vinyl alcohol) (PVA) solution, and prepare the PC thin film via a “one-pot” method, where the colloidal (photonic) crystals (CPC) is immobilized as the PVA solution dries and forms a film [18]
Summary
Micro scale [1,2], and are endowed with photonic bandgap (PBG) properties due to the periodic arrangement of dielectric materials [3,4]. This property leads to many applications, such as photonic fibers, filter films, and lasers [5–7]. One of the most effective preparation methods of PC materials is to self-assemble nano-colloids into so-called colloidal (photonic) crystals (CPC) [6,10–12]. Such an assembly can efficiently diffract structural colors in the visible-light range, and the PBG can be adjusted according to Bragg’s law. We previously reported PC-based lens coatings for UV shielding [19]
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