Direktgenererat polariserat ljus för säker kommunikation
| Reference number | |
| Coordinator | Linköpings universitet - Institutionen för fysik, kemi och biologi (IFM), Linköpings universitet |
| Funding from Vinnova | SEK 2 000 000 |
| Project duration | July 2014 - December 2018 |
| Status | Completed |
Important results from the project
The aim was to develop and commercialize our concept with pyramidal nanostructures, based on quantum dots made of nitride semiconductors. With this concept, linearly polarized light can be generated with an efficiency of >2 higher than today´s methods. This concept provides great potential for applications in optoelectronics e.g.: - Backlighting in LCD - Micro LEDs with an extremely good resolution - Direct-acting RGB emitting nano LEDs with high In-containing InGaN - Interconnects for inter- and intra-chip communication - Quantitative cryptography for secure communication
Expected long term effects
Within the project, patents have been finalized for EU, USA, China and Japan. Of the proposed applications, we have continued with the following: i) Micro LEDs ii) Direct RGB-emitting nano LEDs, iii) Interconnects iv) Quantum cryptography. For continued progress we have searched partnerships with [several large companies]. Best progress in the cooperation has come with [one of the large companies] for micro-LEDs (development of smart watches and VR/AR glasses) and quantum cryptography. The use of nitride semiconductors opens possible heat dissipation that is x10 better than current alternatives.
Approach and implementation
Our concept on the fabrication of light emitters is based on nm-small InGaN quantum dots on top of um-small GaN pyramids, made by selective epitaxial growth in a patterned film. By using these nm-small pyramid-based quantum dots, common negative effects caused by dislocations and In segregation can be suppressed. The positioning and density of pyramids can be controlled by lithography. The optical properties of quantum dots were analyzed by stationary and time-resolved micro-luminescence. Also the generation of individual photons can be studied with correlation techniques.