Photoluminescent Nanofibers for High-Efficiency Solid-State Lighting Phosphors

Investigating Organization

Research Triangle Institute

Principal Investigator(s)

Lynn Davis

Subcontractor

Dimatix, Inc.
Donaldson Company
Elmarco, Inc.
Evident Technologies

Funding Source

Building Technologies Office/NETL

Award

DOE Share: $1,509,903; Contractor Share: $377,475

Contract Period

09/01/06 - 03/31/10

The overall objective of this project was to develop and validate advanced photoluminescent nanofibers (PLN) containing quantum dots (QDs) that improve the external quantum efficiency (EQE) of Solid State Lighting (SSL) devices. This was done in conjunction with an evaluation of manufacturing options for the technology. Forming the PLN with the proper combination of green and red luminescent materials and exciting the nanocomposite with a blue light emitting diode (LED) has been demonstrated to produce high efficiency white light with excellent color rendering properties. The incorporation of QDs in the PLN is particularly advantageous in that this approach enables the correction of any color deficiencies in the light source without creating unnecessary radiation in the near infrared. Cost models developed during this project have demonstrated that the PLN materials can be mass produced at commercially attractive prices and volumes.

To capitalize on the benefits of nanofiber technologies in solid-state lighting, several new remote phosphor reflector configurations were developed in the project. When combined A-41 with these unique lighting designs, nanofibers have a number of demonstrated benefits including:

  • Providing high quantum efficiency down-conversion of LED wavelengths to produce full spectrum white light;
  • Enabling tunable device structures that achieve colors ranging from warm white to cool white with high CRIs;
  • Supplying mass producible, cost-effective solutions for diffuse, high reflectance light management across the visible spectrum;
  • Facilitating remote phosphor luminaire designs that increase the lifetime and performance of luminescent materials.