Fabrication of Bragg Mirrors by Multilayer Inkjet Printing

Abstract

Bragg mirrors are widely applied in optical and photonic devices due to their capability of light management. However, the fabrication of Bragg mirrors is mainly accomplished by physical and chemical vapor deposition processes, which are costly and do not allow for lateral patterning. Here, the fabrication of Bragg mirrors by fully inkjet printing is reported. The photonic bandgap of Bragg mirrors is tailored by adjusting the number of bilayers in the stack and the layer thickness via simply varying printing parameters. An ultrahigh reflectance of 99% is achieved with the devices consisting of ten bilayers only, and the central wavelength of Bragg mirrors is tuned from visible into near‐infrared wavelength range. Inkjet printing allows for fabricating Bragg mirrors on various substrates (e.g., glass and foils), in different sizes and variable lateral patterns. The printed Bragg mirrors not only exhibit a high reflection at designed wavelengths but also show an outstanding homogeneity in color over a large area. The approach thus enables additive manufacturing for various applications ranging from microscale photonic elements to enhanced functionality and aesthetics in large‐area displays and solar technologies.

Colloidal Silicon Quantum Dot‐Based Cavity Light‐Emitting Diodes with Narrowed and Tunable Electroluminescence

“…may also prove useful. [ 30 ] Furthermore, optimizing the fabrication procedure and the device structure [ 9c,13h,20c,31 ] to improve the stability, spectral response, and reproducibility of the cLEDs are subjects of ongoing investigations. Despite these issues, this work demonstrated the first example of an SiQD microcavity‐based hybrid LED that exhibited defined emission and spectral tunability.…”

Zirconia nanocomposites and their applications as transparent advanced optical materials with high refractive index

“…4 An emerging technique, inkjet printing, can be utilized with the solution mixing to produce micropatterned polymer nanocomposite. 36 However, the solution mixing is evaluated as potentially toxic due to needs of large amounts of the volatile organic solvent, and therefore, the great attention to the solvent toxicity is required in the method. Internal mixing is a method widely used with thermoplastics.…”

“…Film casting in a mold and dip or spin coating on a substrate have been adapted to develop polymer nanocomposites using the solution mixing 4 . An emerging technique, inkjet printing, can be utilized with the solution mixing to produce micropatterned polymer nanocomposite 36 . However, the solution mixing is evaluated as potentially toxic due to needs of large amounts of the volatile organic solvent, and therefore, the great attention to the solvent toxicity is required in the method.…”

Advances in multicolor electrochromic devices based on inorganic materials

“…Bragg reflectors, one-dimensional photonic crystals, composed of alternating materials of different refractive index or of varying porosity, are capable of producing a range of vibrant colors. 80,[85][86][87] Anaya et al 88 prepared a series of high porous SiO 2 /low porous TiO 2 distributed Bragg reflectors using the method of stacking (Fig. 10(a)).…”