Red-Shifting LED for Monolithium Full-Colour Display and Phosphor Free White LED


White light LED is one of the key application in solid-state lighting. Coventionally, phosphor is used to convert some blue light into yellow light and produce white light.

  • Red-Shifting LED for Monolithium Full-Colour Display and Phosphor Free White LED
Commercialisation opportunities
Problem addressed

An durable, cost reducing, and efficient multi-wavelength light-emitting device

  • By depositing a layer of Indium Tin Oxide (ITO) on LED wafer followed by subsequent annealing, the process changes the emmissive properties of the wafer and result in a spectral red-shift.
Key impact
  • The design enables a LED wafer with low emission wavelength and thus higher efficiency to be red-shifted, and can avoid growing directly high Indium content LED wafer to retain a high efficiency
  • By selecting the emissive regions, it is able to achieve monolithic multi-wavelength LED, such as monolithic full-colour display and phosphor free white LED
  • Lower cost LED manufacturing
  • Color rendering could be improved by bridging the green gap between Nitride based LED and Phosphide based LED
  • Higher IQE
The University of Hong Kong (HKU)

Founded in 1911, The University of Hong Kong (HKU) is the first and oldest institution of higher education in Hong Kong. For over a century, the University has dedicated itself to creating knowledge, providing education, and serving society. Today, HKU has an established worldwide reputation for being a research-led comprehensive University with ten Faculties and a strong commitment to intellectual freedom, liberty and diversity. HKU has a proud record of academic recognition in researches through honours and awards received from both local and international bodies.