Band Gap Engineering

Band Gap Engineering


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Due to the special structure of photonic band gap materials, light can be localized in a specific area, so as to achieve the purpose of simple and effective control and regulation of photons. Photonic bandgap materials are expected to be used in a series of optoelectronic devices, such as single-mode light-emitting diodes and no (low) threshold lasers, all-optical chips, optical switches and optical filters and sensors, photonic crystal fibers, etc. Alfa Chemistry can provide customers with solutions for photonic bandgap materials using colloidal materials, colloidal self-assembly technology and surface chemistry technologies.

Band Gap Engineering

Research and Practice of Colloids in Band Gap Engineering

Monodisperse colloidal particles can form colloidal crystals under suitable conditions. The micro-nano structure of colloidal crystals endows them with unique optical properties. Compared with other types of photonic crystals, colloidal photonic crystals have the advantages of simple preparation process, low cost, and easy realization of various modifications and functionalizations. These excellent properties make colloidal photonic crystals widely used.

Common colloidal crystals include SiO2, polystyrene latex spheres, ZnO colloidal spheres, SiO2-TiO2, ZnS-SiO2, PS-ZnS and other core-shell particles, iron-cobalt oxide particles, etc. Some gel materials can also be used to construct narrow colloidal crystals. For example, soft thermosensitive microhydrogel particles can be transformed into color-tunable colloidal crystals through volume transformation. The band gap of colloidal crystals can be controlled by surface chemical modification. It was found that the colloidal PbS modified by thiol ligand exchange showed a change in the band gap.

Band Gap EngineeringFig.1 One, two and three-dimensional photonic band-gap structures.[2]

Band Gap EngineeringFig.2 Surface Chemistry Control of Colloidal Quantum Dot.[3]

Alfa Chemistry can provide colloidal crystal-like photonic bandgap materials for bandgap engineering. We have strong R&D capabilities and can utilize a variety of manufacturing and modification techniques to obtain bandgap materials that meet customer needs. We are committed to making unremitting efforts to realize the rich application of colloidal crystals in the optical field.

What Can We Do?

  • Alfa Chemistry provides different colloidal materials and preparation techniques for photonic band gap research.
  • Alfa Chemistry uses surface chemical modification to control the band gap and can provide a comprehensive description of the control phenomenon.
  • Alfa Chemistry is able to work with customers to jointly develop multifunctional colloidal photonic crystals or integrate them into the design of various "smart" materials.


  1. Ding J, et al. Fabrication of Photonic Band Gap Crystals through Colloid Self-Assembly Methods. Progress in Chemistry. 2004, 16(4):492-499.
  2. Tao, Xiaoming. Wearable photonics based on integrative polymeric photonic fibres[M]. 2005.
  3. Giansante C. Surface Chemistry Control of Colloidal Quantum Dot Band Gap. The Journal of Physical Chemistry C. 2018, 122(31).

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