Single-mode light source fabrication based on colloidal quantum dots

Jianfeng Xu, Bing Chen, Sarfaraz Baig, Michael R. Wang

Research output: Contribution to journalConference articlepeer-review


There are huge market demands for innovative, cheap and efficient light sources, including light emitting devices, such as LEDs and lasers. However, the light source development in the visible spectral range encounters significant difficulties these years. The available visible wavelength LEDs or lasers are few, large and expensive. The main challenge lies at the lack of efficient light media. Semiconductor nanocrystal quantum dots (QDs) have recently commanded considerable attention. As a result of quantum confinement effect, the emission color of these QDs covers the whole visible spectral range and can be modified dramatically by simply changing their size. Such spectral tunability, together with large photoluminescence quantum yield and photostability, make QDs attractive for potential applications in a variety of light emitting technologies. However, there are still several technical problems that hinder their application as light sources. One main issue is how to fabricate these QDs into a solid state device while still retaining their original optical emission properties. A vacuum assisted micro-fluidic fabrication of guided wave devices has demonstrated low waveguide propagation loss, lower crosstalk, and improved waveguide structures. We report herein the combination of the excellent emission properties of QDs and novel vacuum assisted micro-fluidic photonic structure fabrication technique to realize single-mode efficient light sources.

Original languageEnglish (US)
Article number722415
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - May 25 2009
EventQuantum Dots, Particles, and Nanoclusters VI - San Jose, CA, United States
Duration: Jan 25 2009Jan 28 2009


  • Light source
  • Micro-fluidic
  • Quantum dots
  • Single-mode
  • Waveguide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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