Low Cost NanoLED with Variable Color Spectrum
- Field
- Electronics
- Patent
- IP00420
Key Problem and Market Opportunity
- Currently, there are two major methods of making broadband LED light sources: 1. Phosphors for “color down” conversion; and 2. Multi-chip LEDs. Phosphorescent materials that emit light when exposed to certain wavelengths of radiation are traditionally used for color conversion in light-emitting diodes (LEDs).
- There are many drawbacks associated with phosphors, including limited lifetime, Stokes-wave energy loss, low reliability and low luminous efficiency. For multi-chip LEDs, where LEDs emitting at the primary colors of light (i.e., blue, green and red) are mounted onto a single package. However, true “white” light emission cannot be achieved using this technique.
Key Advantages of the Technology
- A nano-LED containing an array of nano-pillars of different diameters that are distributed over an emission area of an LED chip is capable of emitting broadband and white or nearly white light.
- Since each pillar emits light at a different wavelength according to its diameter and strain state, by varying the diameter of LEDs ranging from 150nm to 7μm in diameter, different color could be obtained and white light led could be observed.
- The spectral shape can also be tailored for different shades of white emission, by controlling the distribution of the different diameter nano-pillars.
Potential Product and Services
- Low cost, phosphor-free, highly efficient and reliable white LED light source.
Development status and IP Strength
- Prototype Developed
- Patents have been granted in US and KR and pending in PRC and EP